added: to samples: big2.cpp with TTMATH_BITS() macro

git-svn-id: svn://ttmath.org/publicrep/ttmath/trunk@285 e52654a7-88a9-db11-a3e9-0013d4bc506e

samples/Makefile

@@ -8,7 +8,7 @@ CFLAGS = -Wall -pedantic -s -O2 -I..
 	$(CC) -c $(CFLAGS) $<
 
 
-all: uint int big parser
+all: uint int big big2 parser
 
 
 uint: uint.o
@@ -20,6 +20,9 @@ int: int.o
 big: big.o
 	$(CC) -o big $(CFLAGS) big.o
 
+big2: big2.o
+	$(CC) -o big2 $(CFLAGS) big2.o
+
 parser: parser.o
 	$(CC) -o parser $(CFLAGS) parser.o
 
@@ -27,6 +30,7 @@ parser: parser.o
 uint.o:		uint.cpp
 int.o:		int.cpp
 big.o:		big.cpp
+big2.o:		big2.cpp
 parser.o:	parser.cpp
 
 
@@ -36,6 +40,7 @@ clean:
 	rm -f uint
 	rm -f int
 	rm -f big
+	rm -f big2
 	rm -f parser
 # on MS Windows can automatically be added suffixes .exe to the names of output programs
 	rm -f *.exe

samples/big.cpp

@@ -5,8 +5,10 @@
 // this type has 2 words for its mantissa and 1 word for its exponent
 // (on a 32bit platform one word means a word of 32 bits,
 // and on a 64bit platform one word means a word of 64 bits)
+
+// Big<exponent, mantissa>
 typedef ttmath::Big<1,2> MyBig;
- 
+
        
 void SimpleCalculating(const MyBig & a, const MyBig & b)
 {
@@ -56,6 +58,7 @@ MyBig atemp;
 	
 }
 
+
 int main()
 {
 MyBig a,b;
@@ -86,12 +89,12 @@ b = 98767878.124322
 a + b = 98891334.667778
 a - b = -98644421.580866
 a * b = 12193540837712.2708
-a / b = 0.0012499665458095765
+a / b = 0.00124996654580957646
 Calculating with a carry
-a = 1.624801256070839555e+646457012
-b = 456.31999999999999
-a + b = 1.624801256070839555e+646457012
-a - b = 1.624801256070839555e+646457012
+a = 1.624801256066640878e+646457012
+b = 456.319999999999993
+a + b = 1.624801256066640878e+646457012
+a - b = 1.624801256066640878e+646457012
 a * b = (carry)
-a / b = 3.56066193914542334e+646457009
+a / b = 3.560661939136222174e+646457009
 */

samples/big2.cpp

@@ -0,0 +1,113 @@
+#include <ttmath/ttmath.h>
+#include <iostream>
+
+
+// this is a similar example to big.cpp
+// but now we're using TTMATH_BITS() macro
+// this macro returns how many words we need to store
+// the given number of bits
+
+// TTMATH_BITS(64) 
+//   on a 32bit platform the macro returns 2 (2*32=64)
+//   on a 64bit platform the macro returns 1
+
+// TTMATH_BITS(128)
+//   on a 32bit platform the macro returns 4 (4*32=128)
+//   on a 64bit platform the macro returns 2 (2*64=128)
+
+// Big<exponent, mantissa>
+typedef ttmath::Big<TTMATH_BITS(64), TTMATH_BITS(128)> MyBig;
+
+// consequently on a 32bit platform we define: Big<2, 4>
+// and on a 64bit platform: Big<1, 2>
+// and the calculations will be the same on both platforms       
+       
+       
+void SimpleCalculating(const MyBig & a, const MyBig & b)
+{
+	std::cout << "Simple calculating" << std::endl;
+	std::cout << "a = " << a << std::endl;
+	std::cout << "b = " << b << std::endl;
+	std::cout << "a + b = " << a+b << std::endl;
+	std::cout << "a - b = " << a-b << std::endl;
+	std::cout << "a * b = " << a*b << std::endl;
+	std::cout << "a / b = " << a/b << std::endl;
+}
+
+
+void CalculatingWithCarry(const MyBig & a, const MyBig & b)
+{
+MyBig atemp;
+
+	std::cout << "Calculating with a carry" << std::endl;
+	std::cout << "a = " << a << std::endl;
+	std::cout << "b = " << b << std::endl;
+
+	atemp = a;
+	if( !atemp.Add(b) )
+		std::cout << "a + b = " << atemp << std::endl;
+	else
+		std::cout << "a + b = (carry)" << std::endl;
+		// it have no sense to print 'atemp' (it's undefined)
+
+	atemp = a;
+	if( !atemp.Sub(b) )
+		std::cout << "a - b = " << atemp << std::endl;
+	else
+		std::cout << "a - b = (carry)" << std::endl;
+		
+	atemp = a;
+	if( !atemp.Mul(b) )
+		std::cout << "a * b = " << atemp << std::endl;
+	else
+		std::cout << "a * b = (carry)" << std::endl;
+		
+		
+	atemp = a;
+	if( !atemp.Div(b) )
+		std::cout << "a / b = " << atemp << std::endl;
+	else
+		std::cout << "a / b = (carry or division by zero) " << std::endl;
+	
+}
+
+
+int main()
+{
+MyBig a,b;
+	
+	// conversion from 'const char *'
+	a = "123456.543456";
+	b = "98767878.124322";
+	
+	SimpleCalculating(a,b);
+	
+	// 'a' will have the max value which can be held in this type
+	a.SetMax();
+	
+	// conversion from double
+	b = 456.32;
+	
+	// Look at the value 'a' and the product from a+b and a-b
+	// Don't worry this is the nature of floating point numbers
+	CalculatingWithCarry(a,b);
+}
+
+/*
+the result (the same on a 32 or 64bit platform):
+
+Simple calculating
+a = 123456.543456
+b = 98767878.124322
+a + b = 98891334.667778
+a - b = -98644421.580866
+a * b = 12193540837712.270763536832
+a / b = 0.001249966545809576460596448526166860913
+Calculating with a carry
+a = 2.3495345545711177736883282090959505003e+2776511644261678604
+b = 456.3199999999999931787897367030382156
+a + b = 2.3495345545711177736883282090959505003e+2776511644261678604
+a - b = 2.3495345545711177736883282090959505003e+2776511644261678604
+a * b = (carry)
+a / b = 5.1488748127873374141170361292780486452e+2776511644261678601
+*/