#include<stdio.h>
//宏展开后解释成字符串：#
#define fprint(expr) printf(#expr "=%.1f\n",expr)
#define strprint(expr) printf("%s\n",#expr)
//宏展开后拼接变量：##
#define strconcatprint(expr1,expr2) printf("%s\n",expr1##expr2)
int main(){printf("*******************宏展开后解释成字符串：#***********\n");fprint(10.0/2);fprint(18.8);strprint(10/2);strprint(HSJ);printf("*******************宏展开后拼接变量：##***********\n");//定义变量:HSJHSXchar *HSJHSX = "HSJ HSX is smart.";strconcatprint(HSJ,HSX);return 0;
}

输出：

*******************宏展开后解释成字符串：#***********
10.0/2=5.0
18.8=18.8
10/2
HSJ
*******************宏展开后拼接变量：##***********
HSJ HSX is smart.