条件付きコンパイル

  #define なし

   

int main(int argc, char* argv[])
{
	int a = 0;

#if   MY_OPTION == 0
	a++;
#elif MY_OPTION == 1
	a += 1;
#elif MY_OPTION == 2
	a += 2;
#else
	a--;
#endif
	
	return 0;
}
  

この場合は
   

int main(int argc, char* argv[])
{
	int a = 0;

	a++;

	return 0;
}
  

  #define MY_OPTION 0

   

#define MY_OPTION 0

int main(int argc, char* argv[])
{
	int a = 0;

#if   MY_OPTION == 0
	a++;
#elif MY_OPTION == 1
	a += 1;
#elif MY_OPTION == 2
	a += 2;
#else
	a--;
#endif
	
	return 0;
}
  

この場合も
   

int main(int argc, char* argv[])
{
	int a = 0;

	a++;

	return 0;
}
  

  #define MY_OPTION 1

   

#define MY_OPTION 1

int main(int argc, char* argv[])
{
	int a = 0;

#if   MY_OPTION == 0
	a++;
#elif MY_OPTION == 1
	a += 1;
#elif MY_OPTION == 2
	a += 2;
#else
	a--;
#endif
	
	return 0;
}
  

この場合は
   

int main(int argc, char* argv[])
{
	int a = 0;

	a += 1;

	return 0;
}
  

  #define MY_OPTION 2

   

#define MY_OPTION 2

int main(int argc, char* argv[])
{
	int a = 0;

#if   MY_OPTION == 0
	a++;
#elif MY_OPTION == 1
	a += 1;
#elif MY_OPTION == 2
	a += 2;
#else
	a--;
#endif
	
	return 0;
}
  

この場合は
   

int main(int argc, char* argv[])
{
	int a = 0;

	a += 2;

	return 0;
}
  

  #define MY_OPTION 99

   

#define MY_OPTION 99

int main(int argc, char* argv[])
{
	int a = 0;

#if   MY_OPTION == 0
	a++;
#elif MY_OPTION == 1
	a += 1;
#elif MY_OPTION == 2
	a += 2;
#else
	a--;
#endif
	
	return 0;
}
  

この場合は
   

int main(int argc, char* argv[])
{
	int a = 0;

	a--;

	return 0;
}
  


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