类函数宏

/* Note:Your choice is C IDE */
#include "stdio.h"
//类函数宏,知识字符替换，没有运算
#define ok(x) x*x
#define okk(x) (x)*(x)
void main()
{
    int a=2;
    int b=3;
    int c = ok(a+b);//相当于a+b*a+b
    int d = okk(a+b);//相当于(a+b)*(a+b)
    printf("%d
",c);
    printf("%d
",d);
    
}