132 lines
1.8 KiB
C++
Executable File
132 lines
1.8 KiB
C++
Executable File
/*
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* This file is a part of CMSLU -- Content Management System like Unix
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* and is not publicly distributed
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*
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* Copyright (c) 2008-2009, Tomasz Sowa
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* All rights reserved.
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*
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*/
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#include <cstdlib>
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#include <limits.h>
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#include "log.h"
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#include "rebus.h"
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#include "misc.h"
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bool Rebus::InitPair(int a, int b, Item & item)
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{
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char buffer[100];
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bool add = false;
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if( a+b <= 15 )
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{
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sprintf(buffer, "%d+%d", a, b);
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item.question = buffer;
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item.answer = a+b;
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add = true;
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}
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if( a-b >= 0 )
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{
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sprintf(buffer, "%d-%d", a, b);
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item.question = buffer;
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item.answer = a-b;
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add = true;
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}
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return add;
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}
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void Rebus::Init()
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{
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int a, b;
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Item item;
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item.key = 0;
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for(a=1 ; a<10 ; ++a)
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{
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for(b=1 ; b<10 ; ++b)
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{
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if( InitPair(a, b, item) )
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{
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table.push_back(item);
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item.key += 1;
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}
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}
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}
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}
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Rebus::Item * Rebus::Rand()
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{
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size_t len = table.size();
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if( len == 0 )
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// empty table, call Init() first
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return 0;
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size_t i = size_t( ((double)rand()*(double)len) / (double(RAND_MAX)+1.0) );
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if( i >= table.size() )
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{
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log << log1 << "Rebus: Rand() index too big" << logend;
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// oops, it should not be greater then table.size()
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return &table[0];
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}
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return &table[0] + i;
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}
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bool Rebus::IsAnswerOk(Rebus::Item * item, const std::string & answer)
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{
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if( item == 0 )
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return false;
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char * end;
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const char * a = answer.c_str();
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a = SkipWhite(a);
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int value = (int)strtol(a, &end, 10);
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if( a == end )
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// nothing has been read
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return false;
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log << log2 << "Rebus: your answer is: " << value << logend;
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end = (char*)SkipWhite(end);
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if( *end != 0 )
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{
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// something is at the end
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return false;
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}
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bool result = (item->answer == value);
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if( result )
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log << log3 << "Rebus: the answer is correct" << logend;
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return result;
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}
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