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  1. #ifdef 编译时候带参数编译
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#ifdef TAKE
#define THAT 0

#endif


#ifdef TAKE2
#define THAT 2  
#endif


#include<iostream>
using std::cout;
using std::endl;

int main()
{
	
	
	cout<<THAT<<endl;
	
	
	
}
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g++ -DTAKE2 ndef.cpp

选择编译TAKE2的宏定义

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