cppTest-2.3：预处理命令

/** *cppTest-2.3：预处理命令 * *author 炜sama*/#include<iostream.h>#include<stdio.h>//1、输入的3个数据类型必须一样！2、返回的数据类型与输入的数据类型是一样的！//宏名同样区分大小写#define NUM(a,b,c) a##b##c#define TESTvoid main(){//int i[2]={1,2};//cout<<sizeof(i)<<endl;printf("%d\n",NUM(1,2,3));printf("%s\n",NUM("1","2","3"));#ifdef TESTcout<<"TEST"<<endl;#elsecout<<"no TEST"<<endl;#endif#ifndef TESTcout<<"no TEST"<<endl;#elsecout<<"TEST"<<endl;#endif}