diff --git a/help/arithmetic_functions.html b/help/arithmetic_functions.html
index ff3ca25..c83b52b 100644
--- a/help/arithmetic_functions.html
+++ b/help/arithmetic_functions.html
@@ -99,7 +99,8 @@
 <ul>
 <li><a href="other_functions.html">sqrt(x)</a></li>
 <li><a href="other_functions.html">root(x ; n)</a></li>
-<li><a href="other_functions.html">factorial(x)</a></li>
+<li><a href="other_functions.html">factorial(n)</a></li>
+<li><a href="other_functions.html">gamma(x)</a></li>
 <li><a href="other_functions.html">abs(x)</a></li>
 <li><a href="other_functions.html">sgn(x)</a></li>
 <li><a href="other_functions.html">mod(x; y)</a></li>
diff --git a/help/operators_priority.html b/help/operators_priority.html
index 041dc0c..642d589 100644
--- a/help/operators_priority.html
+++ b/help/operators_priority.html
@@ -21,7 +21,8 @@
 <tr><td>Operator</td><td>Description</td><td>Sample</td></tr>
 </thead>
 <tr><td>( )</td><td>parentheses for grouping an expression</td><td>(1+3)*4</td></tr>
-<tr><td>- + # &amp;</td><td>unary minus and plus, and operators for changing the base (radix)</td><td>-10</td></tr>
+<tr><td>- + # &amp;</td><td>unary minus and plus, and operators for changing the base (radix)</td><td>-10<br>&1111 (bin)<br>#ff (hex)</td></tr>
+<tr><td>%</td><td>percentage from a previous value</td><td>100-30%</td></tr>
 <tr><td>^</td><td>powering</td><td>3^2</td></tr>
 <tr><td>* /</td><td>multiplication and division</td><td>10*20</td></tr>
 <tr><td>without an operator</td><td>short form of multiplication<br>(only if the second argument is a variable or function,<br>the same priority as a normal multiplication)</td><td>3y</td></tr>
diff --git a/src/languages.cpp b/src/languages.cpp
index 9d7f4c0..f1f9cc8 100644
--- a/src/languages.cpp
+++ b/src/languages.cpp
@@ -419,13 +419,13 @@ void Languages::InitGuiMessagesTab()
 	InsertGuiPair(combo_rounding_after_comma,"digit(s)");
 	InsertGuiPair(check_remove_zeroes,"Remove last trailing zeroes");
 
-	InsertGuiPair(display_input,			"Input");
-	InsertGuiPair(display_output,			"Output");
+	InsertGuiPair(display_input,			"Input base");
+	InsertGuiPair(display_output,			"Output base");
 	InsertGuiPair(display_rounding,			"Rounding");
 	InsertGuiPair(display_always_scientific,"Always");
 	InsertGuiPair(display_not_always_scientific,"When the exponent is greater than:");
 	InsertGuiPair(display_group_scientific,	"Print the result as the scientific value");
-	InsertGuiPair(display_decimal_point,	"Decimal point");
+	InsertGuiPair(display_decimal_point,	"Output decimal point");
 	InsertGuiPair(display_deg_rad_grad,		"sin/cos asin/acos");
 	InsertGuiPair(convert_type,				"Type");
 	InsertGuiPair(convert_input,			"Input");
diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index 8f93658..619c6a0 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -595,6 +595,10 @@ HWND hTab = GetDlgItem(hWnd,IDC_TAB);
 	SendDlgItemMessage(hWnd,IDC_INPUT_EDIT,EM_SETLIMITTEXT,GetPrgRes()->GetBufferSize()-1,0);
 	SetMenuLanguage(hWnd);
 
+#ifdef TTCALC_PORTABLE
+	SetWindowText(hWnd, "TTCalc portable");
+#endif
+
 return true;
 }
 
diff --git a/src/parsermanager.cpp b/src/parsermanager.cpp
index 2cb626c..3c9c01f 100644
--- a/src/parsermanager.cpp
+++ b/src/parsermanager.cpp
@@ -100,18 +100,27 @@ ttmath::ErrorCode ParserManager::Parse()
 		case 0:
 			parser1.SetBase(base_input);
 			parser1.SetDegRadGrad(angle_deg_rad_grad);
+			parser1.SetComma(input_comma1, input_comma2);
+			parser1.SetGroup(grouping);
+			parser1.SetParamSep(param_sep);
 			code = parser1.Parse(buffer);
 			break;
 
 		case 1:
 			parser2.SetBase(base_input);
 			parser2.SetDegRadGrad(angle_deg_rad_grad);
+			parser2.SetComma(input_comma1, input_comma2);
+			parser2.SetGroup(grouping);
+			parser2.SetParamSep(param_sep);
 			code = parser2.Parse(buffer);
 			break;
 
 		default:
 			parser3.SetBase(base_input);
 			parser3.SetDegRadGrad(angle_deg_rad_grad);
+			parser3.SetComma(input_comma1, input_comma2);
+			parser3.SetGroup(grouping);
+			parser3.SetParamSep(param_sep);
 			code = parser3.Parse(buffer);
 			break;
 		}
@@ -120,6 +129,9 @@ ttmath::ErrorCode ParserManager::Parse()
 
 		parser1.SetBase(base_input);
 		parser1.SetDegRadGrad(angle_deg_rad_grad);
+		parser1.SetComma(input_comma1, input_comma2);
+		parser1.SetGroup(grouping);
+		parser1.SetParamSeparator(param_sep);
 		code = parser1.Parse(buffer);
 
 	#endif
@@ -177,6 +189,47 @@ unsigned int i;
 		decimal_point = '.';
 	else
 		decimal_point = ',';
+
+	// grouping 
+	static char group_table[] = "\0 `'.,"; // 5 items
+
+	int g = GetPrgRes()->GetGrouping();
+	
+	if( g>=0 && g<=5 )
+		grouping = group_table[g];
+	else
+		grouping = 0;
+
+	// input decimal point
+	switch( GetPrgRes()->GetInputDecimalPoint() )
+	{
+	case 0:
+		input_comma1 = '.';
+		input_comma2 = ',';
+		break;
+
+	case 1:
+		input_comma1 = '.';
+		input_comma2 = 0;
+		break;
+
+	case 2:
+	default:
+		input_comma1 = ',';
+		input_comma2 = 0;
+		break;
+	}
+
+	// additional param separator
+	static char param_table[] = ";.,"; // 3 items
+
+	g = GetPrgRes()->GetParamSep();
+	
+	if( g>=0 && g<=3 )
+		param_sep = param_table[g];
+	else
+		param_sep = ';';
+
 }
 
 
diff --git a/src/parsermanager.h b/src/parsermanager.h
index 4300133..7bc0c23 100644
--- a/src/parsermanager.h
+++ b/src/parsermanager.h
@@ -136,6 +136,10 @@ private:
 	ttmath::ErrorCode code;
 	char decimal_point;
 	int angle_deg_rad_grad;
+	int grouping;
+	int input_comma1;
+	int input_comma2;
+	int param_sep;
 
 	/*
 		some buffers which we use in some method in the second thread,
@@ -192,7 +196,17 @@ private:
 					}
 				}
 
-				if( result.ToString(buffer2,base_output, always_scientific, when_scientific, rounding, remove_zeroes, decimal_point) )
+				ttmath::Conv conv;
+
+				conv.base         = base_output;
+				conv.scient       = always_scientific;
+				conv.scient_from  = when_scientific;
+				conv.comma_digits = rounding;
+				conv.trim_zeroes  = remove_zeroes;
+				conv.comma        = decimal_point;
+				conv.group        = grouping;
+
+				if( result.ToString(buffer2, conv) )
 				{
 					// we shouldn't have had this error in the new version of ToStrign(...)
 					// (where we're using a bigger type for calculating)
@@ -208,7 +222,7 @@ private:
 			AddOutputSuffix(buffer1);
 
 			if( i < matparser.stack.size()-1 )
-				buffer1 += "    ";
+				buffer1 += "  ;  ";
 		}
 
 		SetDlgItemText(GetPrgRes()->GetMainWindow(),IDC_OUTPUT_EDIT,buffer1.c_str());
diff --git a/src/programresources.cpp b/src/programresources.cpp
index bd349bc..e8c2be4 100644
--- a/src/programresources.cpp
+++ b/src/programresources.cpp
@@ -514,6 +514,51 @@ int ProgramResources::GetPrecision()
 }
 
 
+void ProgramResources::SetGrouping(int g)
+{
+	grouping = g;
+
+	if( grouping<0 || grouping>5 )
+		g = 0;
+}
+
+
+int ProgramResources::GetGrouping()
+{
+	return grouping;
+}
+
+
+void ProgramResources::SetInputDecimalPoint(int p)
+{
+	input_decimal_point = p;
+
+	if( input_decimal_point<0 || input_decimal_point>2 )
+		decimal_point = 0;
+}
+
+
+int ProgramResources::GetInputDecimalPoint()
+{
+	return input_decimal_point;
+}
+
+
+void ProgramResources::SetParamSep(int s)
+{
+	param_sep = s;
+
+	if( param_sep<0 || param_sep>2 )
+		param_sep = 0;
+}
+
+
+int ProgramResources::GetParamSep()
+{
+	return param_sep;
+}
+
+
 
 ProgramResources::ProgramResources()
 {
@@ -569,6 +614,9 @@ ProgramResources::ProgramResources()
 
 	decimal_point = 0;
 	angle_deg_rad_grad = 1; // rad is default
+	grouping = 0;
+	input_decimal_point = 2; // dot or comma
+	param_sep = 0;
 
 	variables_id = 0;
 	functions_id = 0;
@@ -916,7 +964,7 @@ std::string ini_value[30];
 	iparser.Associate( "global|disp.rounding",			&ini_value[11] );
 	iparser.Associate( "global|size.y",					&ini_value[12] );
 	iparser.Associate( "global|language",				&ini_value[13] );
-	iparser.Associate( "global|disp.dec.point",			&ini_value[14] );
+	iparser.Associate( "global|disp.output_comma",		&ini_value[14] );
 	iparser.Associate( "global|disp.remove.zeroes",		&ini_value[15] );
 	iparser.Associate( "global|disp.deg_rad_grad",		&ini_value[16] );
 	iparser.Associate( "global|pad.x",					&ini_value[17] );
@@ -925,6 +973,9 @@ std::string ini_value[30];
 	iparser.Associate( "global|pad.size.y",				&ini_value[20] );
 	iparser.Associate( "global|pad.maximized",			&ini_value[21] );
 	iparser.Associate( "global|pad",					&ini_value[22] );
+	iparser.Associate( "global|disp.grouping",			&ini_value[23] );
+	iparser.Associate( "global|disp.input_comma",		&ini_value[24] );
+	iparser.Associate( "global|disp.param_sep",			&ini_value[25] );
 
 	iparser.Associate( "variables", &temp_variables );
 	iparser.Associate( "functions", &temp_functions );
@@ -988,6 +1039,10 @@ std::string ini_value[30];
 	show_pad    = bool( atoi(ini_value[22].c_str()) );
 	CheckPadCoordinates();
 
+	SetGrouping( atoi(ini_value[23].c_str()) );
+	SetInputDecimalPoint( atoi(ini_value[24].c_str()) );
+	SetParamSep( atoi(ini_value[24].c_str()) );
+
 	if( err != IniParser::err_ok )
 		bad_line = iparser.GetBadLine();
 
@@ -1008,6 +1063,8 @@ std::ofstream file( configuration_file.c_str() );
 
 	file << "always.on.top = " << (int)always_on_top	<< std::endl;
 	file << "view          = " << (int)view				<< std::endl;
+	file << "language      = " << (int)languages.GetCurrentLanguage()
+														<< std::endl;
 	file << "x             = " << x_pos					<< std::endl;
 	file << "y             = " << y_pos					<< std::endl;
 	file << "size.x        = " << x_size				<< std::endl;
@@ -1022,16 +1079,17 @@ std::ofstream file( configuration_file.c_str() );
 	file << "precision     = " << precision				<< std::endl;
 	file << "disp.input    = " << base_input			<< std::endl;
 	file << "disp.output   = " << base_output			<< std::endl;
-	file << "language      = " << static_cast<int>(languages.GetCurrentLanguage())
-														<< std::endl;
 
 	file << "disp.alw.scientific  = " << (int)display_always_scientific	<< std::endl;
 	file << "disp.when.scientific = " << display_when_scientific		<< std::endl;
 	file << "disp.rounding        = " << display_rounding				<< std::endl;
 	file << "disp.remove.zeroes   = " << (int)remove_zeroes				<< std::endl;
-	file << "disp.dec.point       = " << decimal_point					<< std::endl;
+	file << "disp.input_comma     = " << input_decimal_point			<< std::endl;
+	file << "disp.output_comma    = " << decimal_point					<< std::endl;
 	file << "disp.deg_rad_grad    = " << angle_deg_rad_grad				<< std::endl;
-	
+	file << "disp.grouping        = " << grouping						<< std::endl;
+	file << "disp.param_sep       = " << param_sep						<< std::endl;
+
 
 	file << "\n[variables]\n";
 
diff --git a/src/programresources.h b/src/programresources.h
index 564323b..67ec711 100644
--- a/src/programresources.h
+++ b/src/programresources.h
@@ -388,6 +388,34 @@ public:
 	bool IsPadVisible();
 
 
+	/*!
+		setting/getting the group character
+		0 - none
+		1 - space
+		2 - '`'
+		3 - '\''
+		4 - '.'
+		5 - ','
+	*/
+	void SetGrouping(int g);
+	int  GetGrouping();
+
+
+	/*!
+		setting/getting the input decimal point
+		0 - dot or comma, 1 - dot, 2 - comma
+	*/
+	void SetInputDecimalPoint(int p);
+	int  GetInputDecimalPoint();
+
+
+	/*!
+		setting/getting the separator of function arguments
+		0 - semicolon, 1 - dot, 2 - comma
+	*/
+	void SetParamSep(int s);
+	int  GetParamSep();
+
 
 private:
 
@@ -450,9 +478,13 @@ private:
 	int display_rounding;
 	bool remove_zeroes;
 	int angle_deg_rad_grad;
+	int grouping;				// 0 - none, 1 - space, 2 - '`', 3 - '\'', 4 - '.', 5 - ','
+	int input_decimal_point;	// 0 - dot or comma, 1 - dot, 2 - comma
+	int param_sep;				// parameters separator: 0 - semicolon, 1 - dot, 2 - comma
 
 	int bad_line;
 	bool show_pad;
+	
 
 };
 
diff --git a/src/resource.h b/src/resource.h
index 336fbb6..9616279 100644
--- a/src/resource.h
+++ b/src/resource.h
@@ -84,7 +84,6 @@
 #define IDC_BUTTON_SGN					1075
 #define IDC_BUTTON_MOD					1076
 
-
 // values from IDC_BUTTON_PRESS_0 to IDC_BUTTON_PRESS_9 should be with the step equal one
 #define IDC_BUTTON_PRESS_0				1100
 #define IDC_BUTTON_PRESS_1				1101
@@ -118,6 +117,19 @@
 #define IDC_BUTTON_INT					1129
 #define IDC_BUTTON_ROUND				1130
 #define IDC_BUTTON_EXP					1131
+#define IDC_BUTTON_SQRT					1400
+#define IDC_BUTTON_BRACKETS_ALL			1401
+#define IDC_BUTTON_1DIV_BRACKETS_ALL	1402
+#define IDC_BUTTON_SEMICOLON			1403
+#define IDC_BUTTON_PERCENTAGE			1404
+#define IDC_BUTTON_FLOOR				1405
+#define IDC_BUTTON_CEIL					1406
+#define IDC_BUTTON_MIN					1407
+#define IDC_BUTTON_MAX					1408
+#define IDC_BUTTON_AVG					1409
+#define IDC_BUTTON_SUM					1410
+#define IDC_BUTTON_ROOT					1411
+#define IDC_BUTTON_GAMMA				1412
 
 
 // variables tab
@@ -170,7 +182,12 @@
 #define IDC_CHECK_REMOVE_ZEROES					1171
 #define IDC_LABEL_DISPLAY_DEG_RAD_GRAD			1172
 #define IDC_COMBO_DEG_RAD_GRAD					1173
-
+#define IDC_COMBO_DISPLAY_GROUPING				1174
+#define IDC_LABEL_GROUPING						1175
+#define IDC_COMBO_INPUT_DECIMAL_POINT			1176
+#define IDC_LABEL_INPUT_DECIMAL_POINT			1177
+#define IDC_LABEL_PARAM_SEPARATE				1178
+#define IDC_COMBO_PARAM_SEPARATE				1179
 
 // convert tab
 #define IDC_LIST_UNIT_TYPE						1200
diff --git a/src/resource.rc b/src/resource.rc
index 0bfb195..fb9c2ba 100644
--- a/src/resource.rc
+++ b/src/resource.rc
@@ -1,16 +1,15 @@
-#define APSTUDIO_READONLY_SYMBOLS
+//#define APSTUDIO_READONLY_SYMBOLS
 //#include "afxres.h"
-#undef APSTUDIO_READONLY_SYMBOLS
+//#undef APSTUDIO_READONLY_SYMBOLS
 
 #include "windows.h"
+#include "resource.h"
 
 LANGUAGE LANG_POLISH, 1
-104 ICON "..\\res\\icon02.ico"
+IDI_ICON2 ICON "..\\res\\icon02.ico"
 
 LANGUAGE LANG_POLISH, 2
-105 ICON "..\\res\\icon01.ico"
-
-#include "resource.h"
+IDI_ICON1 ICON "..\\res\\icon01.ico"
 
 LANGUAGE LANG_NEUTRAL, 0
 200 MENU
@@ -80,19 +79,18 @@ BEGIN
     END
 END
 
-101 DIALOG 0, 0, 265, 150
-STYLE DS_SETFONT |DS_CENTER |WS_POPUP |WS_SYSMENU |WS_THICKFRAME |WS_MAXIMIZEBOX |WS_MINIMIZEBOX |WS_CAPTION 
-MENU 200
-#ifndef TTCALC_PORTABLE
+
+101 DIALOGEX 0, 0, 295, 189
+STYLE DS_CENTER | WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_POPUP | WS_CAPTION | 
+    WS_SYSMENU | WS_THICKFRAME
 CAPTION "TTCalc"
-#else
-CAPTION "TTCalc portable"
-#endif
+MENU 200
 FONT 8, "Ms Shell Dlg"
 BEGIN
-  CONTROL "",1000,"EDIT",ES_AUTOHSCROLL |ES_LEFT |WS_CHILD |WS_BORDER |WS_TABSTOP |WS_VISIBLE ,0,6,260,14
-  CONTROL "",1001,"EDIT",ES_READONLY |ES_AUTOHSCROLL |ES_LEFT |WS_CHILD |WS_BORDER |WS_TABSTOP |WS_VISIBLE ,0,21,260,14
-  CONTROL "",1010,"SysTabControl32",WS_CHILD |WS_TABSTOP |WS_GROUP| WS_VISIBLE ,0,39,261,106, WS_EX_CONTROLPARENT
+    EDITTEXT        IDC_INPUT_EDIT,0,6,260,14,ES_AUTOHSCROLL
+    EDITTEXT        IDC_OUTPUT_EDIT,0,21,260,14,ES_AUTOHSCROLL | ES_READONLY
+    CONTROL         "",IDC_TAB,"SysTabControl32",WS_GROUP | WS_TABSTOP,0,39,
+                    292,123,WS_EX_CONTROLPARENT
 END
 
 
@@ -102,12 +100,12 @@ STYLE DS_MODALFRAME | DS_FIXEDSYS | DS_CENTER | WS_POPUP | WS_VISIBLE |
 CAPTION "Add a new variable"
 FONT 8, "Ms Shell Dlg"
 BEGIN
-    DEFPUSHBUTTON   "Ok",1,291,10,50,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "Cancel",2,291,28,50,14,BS_CENTER | BS_VCENTER
-    EDITTEXT        1134,47,10,67,14,ES_AUTOHSCROLL
-    EDITTEXT        1135,47,28,226,14,ES_AUTOHSCROLL
-    LTEXT           "name:",1136,7,12,38,8
-    LTEXT           "value:",1137,7,30,38,8
+    DEFPUSHBUTTON   "Ok",IDOK,291,10,50,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "Cancel",IDCANCEL,291,28,50,14,BS_CENTER | BS_VCENTER
+    EDITTEXT        IDC_EDIT_VARIABLE_NAME,47,10,67,14,ES_AUTOHSCROLL
+    EDITTEXT        IDC_EDIT_VARIABLE_VALUE,47,28,226,14,ES_AUTOHSCROLL
+    LTEXT           "name:",IDC_STATIC_VARIABLE_NAME,7,12,38,8
+    LTEXT           "value:",IDC_STATIC_VARIABLE_VALUE,7,30,38,8
 END
 
 103 DIALOG DISCARDABLE  0, 0, 370, 74
@@ -115,143 +113,184 @@ STYLE DS_MODALFRAME | DS_FIXEDSYS | DS_CENTER | WS_POPUP | WS_VISIBLE |
     WS_CAPTION | WS_SYSMENU
 FONT 8, "Ms Shell Dlg"
 BEGIN
-    DEFPUSHBUTTON   "Ok",1,304,10,50,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "Cancel",2,304,27,50,14,BS_CENTER | BS_VCENTER
-    EDITTEXT        1144,55,10,67,14,ES_AUTOHSCROLL
-    COMBOBOX        1146,55,29,67,130,CBS_DROPDOWNLIST | WS_TABSTOP
-    EDITTEXT        1145,55,47,299,14,ES_AUTOHSCROLL
-    LTEXT           "name:",1147,7,12,46,8
-    LTEXT           "value:",1149,7,49,46,8
-    LTEXT           "param:",1148,7,30,46,8
+    DEFPUSHBUTTON   "Ok",IDOK,304,10,50,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "Cancel",IDCANCEL,304,27,50,14,BS_CENTER | BS_VCENTER
+    EDITTEXT        IDC_EDIT_FUNCTION_NAME,55,10,67,14,ES_AUTOHSCROLL
+    COMBOBOX        IDC_COMBO_FUNCTION_PARAM,55,29,67,130,CBS_DROPDOWNLIST | WS_TABSTOP
+    EDITTEXT        IDC_EDIT_FUNCTION_VALUE,55,47,299,14,ES_AUTOHSCROLL
+    LTEXT           "name:",IDC_STATIC_FUNCTION_NAME,7,12,46,8
+    LTEXT           "value:",IDC_STATIC_FUNCTION_VALUE,7,49,46,8
+    LTEXT           "param:",IDC_STATIC_FUNCTION_PARAM,7,30,46,8
 END
 
 
-110 DIALOGEX 0, 0, 287, 90
-STYLE DS_3DLOOK | DS_FIXEDSYS |DS_SETFONT | WS_CHILD| WS_TABSTOP |WS_GROUP
+110 DIALOG DISCARDABLE  0, 0, 288, 107
+STYLE DS_3DLOOK | DS_FIXEDSYS | WS_CHILD | WS_GROUP | WS_TABSTOP
 FONT 8, "Ms Shell Dlg"
 BEGIN
-    PUSHBUTTON      "Clear",1110,3,3,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "(",1111,33,3,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      ")",1112,62,3,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "^",1128,91,3,26,14,BS_CENTER | BS_BOTTOM
-    PUSHBUTTON      "7",1107,3,20,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "8",1108,33,20,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "9",1109,62,20,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "/",1113,91,20,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "4",1104,3,37,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "5",1105,33,37,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "6",1106,62,37,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "*",1114,91,37,26,14,BS_CENTER | BS_BOTTOM
-    PUSHBUTTON      "1",1101,3,54,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "2",1102,33,54,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "3",1103,62,54,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "-",1115,91,54,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "0",1100,3,71,56,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      ",",1117,62,71,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "+",1116,91,71,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "sin",1120,131,3,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "asin",1071,160,3,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "ln",1124,189,3,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "cos",1121,131,20,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "acos",1072,160,20,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "log",1125,189,20,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "tan",1122,131,37,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "atan",1073,160,37,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "exp",1131,189,37,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "cot",1123,131,54,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "acot",1074,160,54,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "abs",1126,189,54,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "int",1129,131,71,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "round",1130,160,71,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "!",1127,189,71,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "sgn",1075,229,3,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "mod",1076,229,20,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "e",1118,229,37,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "pi",1119,229,54,26,14,BS_CENTER | BS_VCENTER
-    PUSHBUTTON      "err",1070,229,71,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "Clear",IDC_BUTTON_CLEAR,4,3,55,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "(",IDC_BUTTON_FIRST_BRACKET,62,3,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      ")",IDC_BUTTON_LAST_BRACKET,91,3,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "(...)",IDC_BUTTON_BRACKETS_ALL,4,20,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      ";",IDC_BUTTON_SEMICOLON,33,20,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "%",IDC_BUTTON_PERCENTAGE,62,20,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "^",IDC_BUTTON_POWER,91,20,26,14,BS_CENTER | BS_BOTTOM
+    PUSHBUTTON      "7",IDC_BUTTON_PRESS_7,4,37,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "8",IDC_BUTTON_PRESS_8,33,37,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "9",IDC_BUTTON_PRESS_9,62,37,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "/",IDC_BUTTON_DIV,91,37,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "4",IDC_BUTTON_PRESS_4,4,54,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "5",IDC_BUTTON_PRESS_5,33,54,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "6",IDC_BUTTON_PRESS_6,62,54,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "*",IDC_BUTTON_MUL,91,54,26,14,BS_CENTER | BS_BOTTOM
+    PUSHBUTTON      "1",IDC_BUTTON_PRESS_1,4,71,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "2",IDC_BUTTON_PRESS_2,33,71,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "3",IDC_BUTTON_PRESS_3,62,71,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "-",IDC_BUTTON_SUB,91,71,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "0",IDC_BUTTON_PRESS_0,4,88,55,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      ",",IDC_BUTTON_COMMA,62,88,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "+",IDC_BUTTON_ADD,91,88,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "sin",IDC_BUTTON_SIN,131,3,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "asin",IDC_BUTTON_ASIN,160,3,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "ln",IDC_BUTTON_LN,189,3,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "cos",IDC_BUTTON_COS,131,20,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "acos",IDC_BUTTON_ACOS,160,20,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "log",IDC_BUTTON_LOG,189,20,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "tan",IDC_BUTTON_TAN,131,37,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "atan",IDC_BUTTON_ATAN,160,37,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "exp",IDC_BUTTON_EXP,189,37,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "cot",IDC_BUTTON_COT,131,54,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "acot",IDC_BUTTON_ACOT,160,54,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "abs",IDC_BUTTON_ABS,189,54,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "int",IDC_BUTTON_INT,131,71,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "round",IDC_BUTTON_ROUND,160,71,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "mod",IDC_BUTTON_MOD,189,71,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "floor",IDC_BUTTON_FLOOR,131,88,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "ceil",IDC_BUTTON_CEIL,160,88,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "sgn",IDC_BUTTON_SGN,189,88,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "min",IDC_BUTTON_MIN,229,3,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "max",IDC_BUTTON_MAX,258,3,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "avg",IDC_BUTTON_AVG,229,20,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "sum",IDC_BUTTON_SUM,258,20,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "sqrt",IDC_BUTTON_SQRT,229,37,26,14, BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "root",IDC_BUTTON_ROOT,258,37,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "!",IDC_BUTTON_FACTORIAL,229,54,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "gamma",IDC_BUTTON_GAMMA,258,54,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "e",IDC_BUTTON_E,229,71,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "pi",IDC_BUTTON_PI,258,71,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "1/(...)",IDC_BUTTON_1DIV_BRACKETS_ALL,229,88,26,14,BS_CENTER | BS_VCENTER
+    PUSHBUTTON      "err",IDC_BUTTON_ERROR,258,88,26,14,BS_CENTER | BS_VCENTER
 END
 
 
-111 DIALOG 0, 0, 287, 90
+111 DIALOG 0, 0, 288, 107
 STYLE DS_3DLOOK |DS_FIXEDSYS |DS_SETFONT |WS_CHILD | WS_TABSTOP |WS_GROUP
 CAPTION "tab2"
 FONT 8, "Ms Shell Dlg"
 BEGIN
-  CONTROL "Add",1133,"BUTTON",BS_PUSHBUTTON |BS_VCENTER |BS_CENTER |WS_CHILD |WS_TABSTOP |WS_VISIBLE ,3,3,50,14
-  CONTROL "Edit",1138,"BUTTON",BS_PUSHBUTTON |BS_VCENTER |BS_CENTER |WS_CHILD |WS_TABSTOP |WS_VISIBLE ,3,21,50,14
-  CONTROL "Delete",1139,"BUTTON",BS_PUSHBUTTON |BS_VCENTER |BS_CENTER |WS_CHILD |WS_TABSTOP |WS_VISIBLE ,3,39,50,14
-  CONTROL "",1132,"SysListView32",LVS_REPORT |LVS_SHOWSELALWAYS |LVS_SORTASCENDING |LVS_ALIGNLEFT |WS_CHILD |WS_BORDER |WS_TABSTOP |WS_VISIBLE ,57,3,223,85
+  CONTROL "Add",IDC_BUTTON_ADD_VARIABLE,"BUTTON",BS_PUSHBUTTON |BS_VCENTER |BS_CENTER |WS_CHILD |WS_TABSTOP |WS_VISIBLE ,3,3,50,14
+  CONTROL "Edit",IDC_BUTTON_EDIT_VARIABLE,"BUTTON",BS_PUSHBUTTON |BS_VCENTER |BS_CENTER |WS_CHILD |WS_TABSTOP |WS_VISIBLE ,3,21,50,14
+  CONTROL "Delete",IDC_BUTTON_DELETE_VARIABLE,"BUTTON",BS_PUSHBUTTON |BS_VCENTER |BS_CENTER |WS_CHILD |WS_TABSTOP |WS_VISIBLE ,3,39,50,14
+  CONTROL "",IDC_VARIABLES_LIST,"SysListView32",LVS_REPORT |LVS_SHOWSELALWAYS |LVS_SORTASCENDING |LVS_ALIGNLEFT |WS_CHILD |WS_BORDER |WS_TABSTOP |WS_VISIBLE ,57,3,223,85
 END
 
-112 DIALOG 0, 0, 287, 90
+112 DIALOG 0, 0, 288, 107
 STYLE DS_3DLOOK |DS_FIXEDSYS |DS_SETFONT |WS_CHILD | WS_TABSTOP |WS_GROUP
 CAPTION "tab3"
 FONT 8, "Ms Shell Dlg"
 BEGIN
-  CONTROL "Add",1140,"BUTTON",BS_PUSHBUTTON |BS_VCENTER |BS_CENTER |WS_CHILD |WS_TABSTOP |WS_VISIBLE ,3,3,50,14
-  CONTROL "Edit",1141,"BUTTON",BS_PUSHBUTTON |BS_VCENTER |BS_CENTER |WS_CHILD |WS_TABSTOP |WS_VISIBLE ,3,21,50,14
-  CONTROL "Delete",1142,"BUTTON",BS_PUSHBUTTON |BS_VCENTER |BS_CENTER |WS_CHILD |WS_TABSTOP |WS_VISIBLE ,3,39,50,14
-  CONTROL "",1143,"SysListView32",LVS_REPORT |LVS_SHOWSELALWAYS |LVS_SORTASCENDING |LVS_ALIGNLEFT |WS_CHILD |WS_BORDER |WS_TABSTOP |WS_VISIBLE ,57,3,223,85
+  CONTROL "Add",IDC_BUTTON_ADD_FUNCTION,"BUTTON",BS_PUSHBUTTON |BS_VCENTER |BS_CENTER |WS_CHILD |WS_TABSTOP |WS_VISIBLE ,3,3,50,14
+  CONTROL "Edit",IDC_BUTTON_EDIT_FUNCTION,"BUTTON",BS_PUSHBUTTON |BS_VCENTER |BS_CENTER |WS_CHILD |WS_TABSTOP |WS_VISIBLE ,3,21,50,14
+  CONTROL "Delete",IDC_BUTTON_DELETE_FUNCTION,"BUTTON",BS_PUSHBUTTON |BS_VCENTER |BS_CENTER |WS_CHILD |WS_TABSTOP |WS_VISIBLE ,3,39,50,14
+  CONTROL "",IDC_FUNCTIONS_LIST,"SysListView32",LVS_REPORT |LVS_SHOWSELALWAYS |LVS_SORTASCENDING |LVS_ALIGNLEFT |WS_CHILD |WS_BORDER |WS_TABSTOP |WS_VISIBLE ,57,3,223,85
 END
 
 #ifndef TTCALC_PORTABLE
 
-113 DIALOG 0, 0, 287, 90
-STYLE DS_3DLOOK |DS_FIXEDSYS |DS_SETFONT |WS_CHILD | WS_TABSTOP |WS_GROUP
+113 DIALOG DISCARDABLE  0, 0, 288, 107
+STYLE DS_3DLOOK | DS_FIXEDSYS | WS_CHILD | WS_CAPTION | WS_GROUP | 
+    WS_TABSTOP
 CAPTION "tab4"
 FONT 8, "Ms Shell Dlg"
 BEGIN
-  CONTROL "precision 1",1150,"BUTTON",BS_AUTORADIOBUTTON |BS_LEFT |WS_CHILD |WS_GROUP|WS_TABSTOP | WS_VISIBLE ,15,4,252,10
-  CONTROL "precision 2",1151,"BUTTON",BS_AUTORADIOBUTTON |BS_LEFT |WS_CHILD |WS_TABSTOP | WS_VISIBLE ,15,33,252,10
-  CONTROL "precision 3",1152,"BUTTON",BS_AUTORADIOBUTTON |BS_LEFT |WS_CHILD |WS_TABSTOP | WS_VISIBLE ,15,62,252,10
-  CONTROL "info 1",1153,"STATIC",SS_LEFT |WS_CHILD |WS_VISIBLE ,28,17,245,8
-  CONTROL "info 2",1154,"STATIC",SS_LEFT |WS_CHILD |WS_VISIBLE ,28,46,245,8
-  CONTROL "info 3",1155,"STATIC",SS_LEFT |WS_CHILD |WS_VISIBLE ,28,74,245,8
+    CONTROL         "precision 1",IDC_RADIO_PRECISION_1,"Button",
+                    BS_AUTORADIOBUTTON | BS_LEFT | WS_GROUP | WS_TABSTOP,21,
+                    11,256,10
+    CONTROL         "precision 2",IDC_RADIO_PRECISION_2,"Button",
+                    BS_AUTORADIOBUTTON | BS_LEFT | WS_TABSTOP,21,42,256,10
+    CONTROL         "precision 3",IDC_RADIO_PRECISION_3,"Button",
+                    BS_AUTORADIOBUTTON | BS_LEFT | WS_TABSTOP,21,73,256,10
+    LTEXT           "info 1",IDC_LABEL_PRECISION_1_INFO,38,24,239,8,NOT 
+                    WS_GROUP
+    LTEXT           "info 2",IDC_LABEL_PRECISION_2_INFO,38,55,239,8,NOT 
+                    WS_GROUP
+    LTEXT           "info 3",IDC_LABEL_PRECISION_3_INFO,38,85,239,8,NOT 
+                    WS_GROUP
 END
 
 #endif
 
 
-114 DIALOG DISCARDABLE  0, 0, 255, 90
+114 DIALOG DISCARDABLE  0, 0, 288, 107
 STYLE DS_3DLOOK | DS_FIXEDSYS | WS_CHILD | WS_CAPTION | WS_GROUP | 
     WS_TABSTOP
 CAPTION "tab5"
 FONT 8, "Ms Shell Dlg"
 BEGIN
-    COMBOBOX        1156,58,5,58,200,CBS_DROPDOWNLIST | WS_GROUP | 
+    CONTROL         "Input base",IDC_LABEL_DISPLAY_INPUT,"Static",
+                    SS_LEFTNOWORDWRAP | WS_GROUP,8,4,43,8
+    CONTROL         "Output base",IDC_LABEL_DISPLAY_OUTPUT,"Static",
+                    SS_LEFTNOWORDWRAP | WS_GROUP,8,18,43,8
+    CONTROL         "Rounding",IDC_LABEL_DISPLAY_ROUNDING,"Static",
+                    SS_LEFTNOWORDWRAP | WS_GROUP,8,32,43,8
+    CONTROL         "Grouping",IDC_LABEL_GROUPING,"Static",SS_LEFTNOWORDWRAP | 
+                    WS_GROUP,8,46,43,8
+    COMBOBOX        IDC_COMBO_DISPLAY_INPUT,61,2,49,200,CBS_DROPDOWNLIST | 
+                    WS_GROUP | WS_TABSTOP
+    COMBOBOX        IDC_COMBO_DISPLAY_OUTPUT,61,16,49,200,CBS_DROPDOWNLIST | 
                     WS_TABSTOP
-    COMBOBOX        1157,58,19,58,200,CBS_DROPDOWNLIST | WS_TABSTOP
-    CONTROL         "Input",1162,"Static",SS_LEFTNOWORDWRAP | WS_GROUP,11,7,
-                    43,8
-    CONTROL         "Output",1163,"Static",SS_LEFTNOWORDWRAP | WS_GROUP,11,
-                    22,43,8
-    COMBOBOX        1159,58,33,58,200,CBS_DROPDOWNLIST | WS_TABSTOP
-    CONTROL         "Rounding",1164,"Static",SS_LEFTNOWORDWRAP | WS_GROUP,11,
-                    36,43,8
-    COMBOBOX        1173,213,5,38,54,CBS_DROPDOWNLIST | WS_TABSTOP
-    CONTROL         "sin/cos asin/acos",1172,"Static",SS_LEFTNOWORDWRAP | 
-                    WS_GROUP,137,7,73,8
-    COMBOBOX        1170,213,19,38,62,CBS_DROPDOWNLIST | WS_TABSTOP
-    CONTROL         "Decimal point",1169,"Static",SS_LEFTNOWORDWRAP | 
-                    WS_GROUP,137,22,73,8
-    CONTROL         "remove trailing zeroes",1171,"Button",BS_AUTOCHECKBOX | 
-                    BS_LEFTTEXT | BS_LEFT | WS_TABSTOP,136,36,115,10
-    CONTROL         "Always",1160,"Button",BS_AUTORADIOBUTTON | BS_LEFT | 
-                    WS_GROUP | WS_TABSTOP,19,65,54,10
-    CONTROL         "When the exponent is greater than:",1161,"Button",
-                    BS_AUTORADIOBUTTON | BS_LEFT,77,65,138,10
-    EDITTEXT        1166,217,63,29,14,ES_NUMBER | WS_GROUP
-    CONTROL         "",1165,"msctls_updown32",UDS_SETBUDDYINT | 
-                    UDS_ALIGNRIGHT | UDS_ARROWKEYS,201,73,11,14
-    GROUPBOX        "Print scientific value",1168,11,51,240,31
+    COMBOBOX        IDC_COMBO_DISPLAY_ROUNDING,61,30,49,200,CBS_DROPDOWNLIST | 
+                    WS_TABSTOP
+    COMBOBOX        IDC_COMBO_DISPLAY_GROUPING,61,44,49,112,CBS_DROPDOWNLIST | 
+                    WS_VSCROLL | WS_TABSTOP
+    COMBOBOX        IDC_COMBO_DEG_RAD_GRAD,234,44,49,53,CBS_DROPDOWNLIST | 
+                    WS_TABSTOP
+    CONTROL         "sin/cos asin/acos",IDC_LABEL_DISPLAY_DEG_RAD_GRAD,
+                    "Static",SS_LEFTNOWORDWRAP | WS_GROUP,143,46,87,8
+    COMBOBOX        IDC_COMBO_DECIMAL_POINT,234,16,49,62,CBS_DROPDOWNLIST | 
+                    WS_TABSTOP
+    CONTROL         "Output decimal point",IDC_LABEL_DECIMAL_POINT,"Static",
+                    SS_LEFTNOWORDWRAP | WS_GROUP,143,18,87,8
+    CONTROL         "remove trailing zeroes",IDC_CHECK_REMOVE_ZEROES,"Button",
+                    BS_AUTOCHECKBOX | BS_LEFTTEXT | BS_LEFT | WS_TABSTOP,142,
+                    60,139,10
+    CONTROL         "Always",IDC_RADIO_DISPLAY_ALWAYS_SCIENTIFIC,"Button",
+                    BS_AUTORADIOBUTTON | BS_LEFT | WS_GROUP | WS_TABSTOP,14,
+                    87,54,10
+    CONTROL         "When the exponent is greater than:",
+                    IDC_RADIO_DISPLAY_NOT_ALWAYS_SCIENTIFIC,"Button",
+                    BS_AUTORADIOBUTTON | BS_LEFT,90,87,151,10
+    EDITTEXT        IDC_EDIT_DISPLAY_WHEN_SCIENTIFIC,245,84,29,14,ES_NUMBER | 
+                    WS_GROUP
+    CONTROL         "",IDC_UPDOWN_DISPLAY_WHEN_SCIENTIFIC,"msctls_updown32",
+                    UDS_SETBUDDYINT | UDS_ALIGNRIGHT | UDS_ARROWKEYS,276,84,
+                    11,14
+    GROUPBOX        "Print scientific value",IDC_LABEL_GROUP_SCIENTIFIC,8,75,
+                    275,27
+    COMBOBOX        IDC_COMBO_INPUT_DECIMAL_POINT,234,2,49,56,
+                    CBS_DROPDOWNLIST | WS_VSCROLL | WS_TABSTOP
+    CONTROL         "Input decimal point",IDC_LABEL_INPUT_DECIMAL_POINT,
+                    "Static",SS_LEFTNOWORDWRAP | WS_GROUP,143,4,87,8
+    COMBOBOX        IDC_COMBO_PARAM_SEPARATE,234,30,49,54,CBS_DROPDOWNLIST | 
+                    WS_VSCROLL | WS_TABSTOP
+    CONTROL         "Parameters separated by",IDC_LABEL_PARAM_SEPARATE,
+                    "Static",SS_LEFTNOWORDWRAP | WS_GROUP,143,32,87,8
 END
 
 
-
-
 #ifdef TTCALC_CONVERT
 
-115 DIALOG DISCARDABLE  0, 0, 260, 90
+115 DIALOG DISCARDABLE  0, 0, 288, 107
 STYLE DS_3DLOOK | DS_FIXEDSYS | WS_CHILD | WS_CAPTION | WS_GROUP | 
     WS_TABSTOP
 CAPTION "tab6"
diff --git a/src/tabs.cpp b/src/tabs.cpp
index 51ca27b..e253050 100644
--- a/src/tabs.cpp
+++ b/src/tabs.cpp
@@ -157,7 +157,7 @@ return true;
 
 BOOL WmTabCommand_Press_log(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 {
-	InsertText("log( ; )",-4);
+	InsertText("log( ; 2)",-5);
 
 return true;
 }
@@ -240,8 +240,11 @@ BOOL WmTabCommand_Press_error(HWND hWnd, UINT message, WPARAM wParam, LPARAM lPa
 	if( last_code != ttmath::err_ok )
 	{
 		PrintErrorCode();
+		HWND input_edit = GetDlgItem( GetPrgRes()->GetMainWindow(), IDC_INPUT_EDIT );
+		SetFocus(input_edit);
 	}
 
+
 return true;
 }
 
@@ -825,6 +828,7 @@ BOOL WmTabCommand_RemoveZeroesChanged(HWND hWnd, UINT message, WPARAM wParam, LP
 return true;
 }
 
+
 BOOL WmTabCommand_DisplayDegRadGradChanged(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 {
 	if( HIWORD(wParam) != CBN_SELCHANGE )
@@ -838,6 +842,46 @@ return true;
 }
 
 
+BOOL WmTabCommand_DisplayGrouping(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+	if( HIWORD(wParam) != CBN_SELCHANGE )
+		return false;
+
+	GetPrgRes()->GetThreadController()->StopCalculating();
+	GetPrgRes()->SetGrouping( (int)SendDlgItemMessage(hWnd, IDC_COMBO_DISPLAY_GROUPING, CB_GETCURSEL, 0, 0) );
+	GetPrgRes()->GetThreadController()->StartCalculating();
+
+return true;
+}
+
+
+BOOL WmTabCommand_DisplayInputDecimalPoint(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+	if( HIWORD(wParam) != CBN_SELCHANGE )
+		return false;
+
+	GetPrgRes()->GetThreadController()->StopCalculating();
+	GetPrgRes()->SetInputDecimalPoint( (int)SendDlgItemMessage(hWnd, IDC_COMBO_INPUT_DECIMAL_POINT, CB_GETCURSEL, 0, 0) );
+	GetPrgRes()->GetThreadController()->StartCalculating();
+
+return true;
+}
+
+
+
+BOOL WmTabCommand_DisplayParamSep(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+	if( HIWORD(wParam) != CBN_SELCHANGE )
+		return false;
+
+	GetPrgRes()->GetThreadController()->StopCalculating();
+	GetPrgRes()->SetParamSep( (int)SendDlgItemMessage(hWnd, IDC_COMBO_PARAM_SEPARATE, CB_GETCURSEL, 0, 0) );
+	GetPrgRes()->GetThreadController()->StartCalculating();
+
+return true;
+}
+
+
 void SetDisablingDisplayWhenScientific(HWND hWnd)
 {
 	if( IsDlgButtonChecked(hWnd, IDC_RADIO_DISPLAY_ALWAYS_SCIENTIFIC) == BST_CHECKED )
@@ -922,6 +966,243 @@ return true;
 
 
 
+int CalcBracketsPrev(const char * buf, int start)
+{
+int last;
+int brackets;
+
+	last = start;
+	--start;
+
+	while( true )
+	{
+		for( ; start>=0 && buf[start]!=';' ; --start )
+			if( buf[start] != ' ' )
+				last = start;
+
+		if( start <= 0 )
+			return last;
+
+		--start; // skipping a semicolon
+		brackets = 0;
+
+		for( ; start>=0 ; --start )
+		{
+			if( buf[start] == '(' )
+				++brackets;
+			else
+			if( buf[start] == ')' )
+				--brackets;
+
+			if( brackets > 0 )
+			{
+				last = start;
+				break;
+			}
+		}
+	}
+}
+
+
+
+int CalcBracketsNext(const char * buf, int size, int start)
+{
+int last;
+int brackets;
+
+	if( start >= size )
+		return size;
+
+	last = start;
+
+	while( true )
+	{
+		for( ; start<size && buf[start]!=';' ; ++start )
+			if( buf[start] != ' ' )
+				last = start;
+
+		if( start >= size )
+		{
+			if( buf[last] == ';' || buf[last] == ' ' )
+				return last;
+			else
+				return last+1;
+		}
+
+		++start; // skipping a semicolon
+		brackets = 0;
+
+		for( ; start<size ; ++start )
+		{
+			if( buf[start] == '(' )
+				++brackets;
+			else
+			if( buf[start] == ')' )
+				--brackets;
+
+			if( brackets < 0 )
+			{
+				last = start;
+				break;
+			}
+		}
+	}
+}
+
+
+void CalcBracketsPos(HWND input, int & start, int & end)
+{
+DWORD sel_start, sel_end;
+
+	SendMessage(input, EM_GETSEL, (WPARAM)&sel_start, (LPARAM)&sel_end);
+
+	if( sel_start != sel_end )
+	{	
+		start = sel_start;
+		end = sel_end;
+		return;
+	}
+
+	start = 0;
+	end   = SendMessage(input, EM_LINELENGTH, 0, 0);
+
+	if( end > 0 )
+	{
+		const char * buf = new char[end+sizeof(WORD)];
+		*(WORD*)(buf) = end;
+		SendMessage(input, EM_GETLINE, 0, (LPARAM)buf);
+
+		start = CalcBracketsPrev(buf, sel_start);
+		end   = CalcBracketsNext(buf, end, sel_start);
+
+		delete [] buf;
+	}
+}
+
+
+
+BOOL WmTabCommand_Press_bracketsall(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+	HWND main  = GetPrgRes()->GetMainWindow();
+	HWND input = GetDlgItem(main, IDC_INPUT_EDIT);
+
+	int start, end;
+	CalcBracketsPos(input, start, end);
+
+	SendMessage(input, EM_SETSEL, start, start);
+	SendMessage(input, EM_REPLACESEL, 1, LPARAM("("));
+	
+	SendMessage(input, EM_SETSEL, end+1, end+1);
+	SendMessage(input, EM_REPLACESEL, 1, LPARAM(")"));
+
+	SetFocus(input);
+
+return true;
+}
+
+
+BOOL WmTabCommand_Press_1div_bracketsall(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+	HWND main  = GetPrgRes()->GetMainWindow();
+	HWND input = GetDlgItem(main, IDC_INPUT_EDIT);
+
+	int start, end;
+	CalcBracketsPos(input, start, end);
+
+	SendMessage(input, EM_SETSEL, start, start);
+	SendMessage(input, EM_REPLACESEL, 1, LPARAM("1/("));
+	
+	SendMessage(input, EM_SETSEL, end+3, end+3);
+	SendMessage(input, EM_REPLACESEL, 1, LPARAM(")"));
+
+	SetFocus(input);
+
+return true;
+}
+
+
+BOOL WmTabCommand_Press_semicolon(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+	InsertText(" ; ", 0);
+
+return true;
+}
+
+
+BOOL WmTabCommand_Press_percentage(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+	InsertText("%", 0);
+
+return true;
+}
+
+
+BOOL WmTabCommand_Press_floor(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+	InsertText("floor()", -1);
+
+return true;
+}
+
+
+BOOL WmTabCommand_Press_ceil(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+	InsertText("ceil()", -1);
+
+return true;
+}
+
+
+BOOL WmTabCommand_Press_min(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+	InsertText("min()", -1);
+
+return true;
+}
+
+
+BOOL WmTabCommand_Press_max(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+	InsertText("max()", -1);
+
+return true;
+}
+
+
+BOOL WmTabCommand_Press_avg(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+	InsertText("avg()", -1);
+
+return true;
+}
+
+
+BOOL WmTabCommand_Press_sum(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+	InsertText("sum()", -1);
+
+return true;
+}
+
+
+BOOL WmTabCommand_Press_root(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+	InsertText("root( ; 2)", -5);
+
+return true;
+}
+
+
+BOOL WmTabCommand_Press_gamma(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+	InsertText("gamma()", -1);
+
+return true;
+}
+
+
+
+
 void CreateTabCommandMessagesTable(Messages<BOOL> & cmessages)
 {
 	cmessages.Associate(IDC_BUTTON_PRESS_0, WmTabCommand_Press_0_9);
@@ -946,6 +1227,16 @@ void CreateTabCommandMessagesTable(Messages<BOOL> & cmessages)
 	cmessages.Associate(IDC_BUTTON_LOG, WmTabCommand_Press_log);
 	cmessages.Associate(IDC_BUTTON_ABS, WmTabCommand_Press_abs);
 	cmessages.Associate(IDC_BUTTON_FACTORIAL, WmTabCommand_Press_factorial);
+	cmessages.Associate(IDC_BUTTON_SEMICOLON, WmTabCommand_Press_semicolon);
+	cmessages.Associate(IDC_BUTTON_PERCENTAGE, WmTabCommand_Press_percentage);
+	cmessages.Associate(IDC_BUTTON_FLOOR, WmTabCommand_Press_floor);
+	cmessages.Associate(IDC_BUTTON_CEIL, WmTabCommand_Press_ceil);
+	cmessages.Associate(IDC_BUTTON_MIN, WmTabCommand_Press_min);
+	cmessages.Associate(IDC_BUTTON_MAX, WmTabCommand_Press_max);
+	cmessages.Associate(IDC_BUTTON_AVG, WmTabCommand_Press_avg);
+	cmessages.Associate(IDC_BUTTON_SUM, WmTabCommand_Press_sum);
+	cmessages.Associate(IDC_BUTTON_ROOT, WmTabCommand_Press_root);
+	cmessages.Associate(IDC_BUTTON_GAMMA, WmTabCommand_Press_gamma);
 
 
 	
@@ -966,11 +1257,12 @@ void CreateTabCommandMessagesTable(Messages<BOOL> & cmessages)
 	cmessages.Associate(IDC_BUTTON_SGN, WmTabCommand_Press_sgn);
 	cmessages.Associate(IDC_BUTTON_MOD, WmTabCommand_Press_mod);
 
-
 	cmessages.Associate(IDC_BUTTON_POWER, WmTabCommand_Press_power);
 	cmessages.Associate(IDC_BUTTON_INT, WmTabCommand_Press_int);
 	cmessages.Associate(IDC_BUTTON_ROUND, WmTabCommand_Press_round);
 	cmessages.Associate(IDC_BUTTON_EXP, WmTabCommand_Press_exp);
+	cmessages.Associate(IDC_BUTTON_BRACKETS_ALL, WmTabCommand_Press_bracketsall);
+	cmessages.Associate(IDC_BUTTON_1DIV_BRACKETS_ALL, WmTabCommand_Press_1div_bracketsall);
 
 	cmessages.Associate(IDC_BUTTON_ADD_VARIABLE, Variables::WmTabCommand_AddVariable);
 	cmessages.Associate(IDC_BUTTON_EDIT_VARIABLE, Variables::WmTabCommand_EditVariable);
@@ -995,13 +1287,14 @@ void CreateTabCommandMessagesTable(Messages<BOOL> & cmessages)
 	cmessages.Associate(IDC_COMBO_DISPLAY_OUTPUT, WmTabCommand_DisplayOutputChanged);
 	cmessages.Associate(IDC_COMBO_DISPLAY_ROUNDING, WmTabCommand_DisplayRoundingChanged);
 	cmessages.Associate(IDC_CHECK_REMOVE_ZEROES, WmTabCommand_RemoveZeroesChanged);
-
 	cmessages.Associate(IDC_RADIO_DISPLAY_ALWAYS_SCIENTIFIC, WmTabCommand_SetDisplayAlwaysScientific);
 	cmessages.Associate(IDC_RADIO_DISPLAY_NOT_ALWAYS_SCIENTIFIC, WmTabCommand_SetDisplayNotAlwaysScientific);
 	cmessages.Associate(IDC_EDIT_DISPLAY_WHEN_SCIENTIFIC, WmTabCommand_SetDisplayWhenScientific);
 	cmessages.Associate(IDC_COMBO_DECIMAL_POINT, WmTabCommand_DisplayDecimalPointChanged);
 	cmessages.Associate(IDC_COMBO_DEG_RAD_GRAD, WmTabCommand_DisplayDegRadGradChanged);
-
+	cmessages.Associate(IDC_COMBO_DISPLAY_GROUPING, WmTabCommand_DisplayGrouping);
+	cmessages.Associate(IDC_COMBO_INPUT_DECIMAL_POINT, WmTabCommand_DisplayInputDecimalPoint);
+	cmessages.Associate(IDC_COMBO_PARAM_SEPARATE, WmTabCommand_DisplayParamSep);
 }
 
 /*
@@ -1268,9 +1561,25 @@ char buffer[20];
 	SendDlgItemMessage(hWnd, IDC_COMBO_DEG_RAD_GRAD, CB_ADDSTRING, 0, (LPARAM)"deg");
 	SendDlgItemMessage(hWnd, IDC_COMBO_DEG_RAD_GRAD, CB_ADDSTRING, 0, (LPARAM)"rad");
 	SendDlgItemMessage(hWnd, IDC_COMBO_DEG_RAD_GRAD, CB_ADDSTRING, 0, (LPARAM)"grad");
-
 	SendDlgItemMessage(hWnd, IDC_COMBO_DEG_RAD_GRAD, CB_SETCURSEL, GetPrgRes()->GetDegRadGrad(), 0);
-	
+
+	SendDlgItemMessage(hWnd, IDC_COMBO_DISPLAY_GROUPING, CB_ADDSTRING, 0, (LPARAM)"none");
+	SendDlgItemMessage(hWnd, IDC_COMBO_DISPLAY_GROUPING, CB_ADDSTRING, 0, (LPARAM)"space");
+	SendDlgItemMessage(hWnd, IDC_COMBO_DISPLAY_GROUPING, CB_ADDSTRING, 0, (LPARAM)" `");
+	SendDlgItemMessage(hWnd, IDC_COMBO_DISPLAY_GROUPING, CB_ADDSTRING, 0, (LPARAM)" '");
+	SendDlgItemMessage(hWnd, IDC_COMBO_DISPLAY_GROUPING, CB_ADDSTRING, 0, (LPARAM)" .");
+	SendDlgItemMessage(hWnd, IDC_COMBO_DISPLAY_GROUPING, CB_ADDSTRING, 0, (LPARAM)" ,");
+	SendDlgItemMessage(hWnd, IDC_COMBO_DISPLAY_GROUPING, CB_SETCURSEL, GetPrgRes()->GetGrouping(), 0);
+
+	SendDlgItemMessage(hWnd, IDC_COMBO_INPUT_DECIMAL_POINT, CB_ADDSTRING, 0, (LPARAM)" . or ,");
+	SendDlgItemMessage(hWnd, IDC_COMBO_INPUT_DECIMAL_POINT, CB_ADDSTRING, 0, (LPARAM)" .");
+	SendDlgItemMessage(hWnd, IDC_COMBO_INPUT_DECIMAL_POINT, CB_ADDSTRING, 0, (LPARAM)" ,");
+	SendDlgItemMessage(hWnd, IDC_COMBO_INPUT_DECIMAL_POINT, CB_SETCURSEL, GetPrgRes()->GetInputDecimalPoint(), 0);
+
+	SendDlgItemMessage(hWnd, IDC_COMBO_PARAM_SEPARATE, CB_ADDSTRING, 0, (LPARAM)" ;");
+	SendDlgItemMessage(hWnd, IDC_COMBO_PARAM_SEPARATE, CB_ADDSTRING, 0, (LPARAM)" ; or .");
+	SendDlgItemMessage(hWnd, IDC_COMBO_PARAM_SEPARATE, CB_ADDSTRING, 0, (LPARAM)" ; or ,");
+	SendDlgItemMessage(hWnd, IDC_COMBO_PARAM_SEPARATE, CB_SETCURSEL, GetPrgRes()->GetParamSep(), 0);
 
 return true;
 }