9.2.cpp

c入门代码大全

//9.2:在宏定义中引用已定义的宏名
#include<stdio.h>
#define R 3.0
#define PI 3.1415926
#define L 2*PI*R
#define S PI*R*R
int main()
{
    printf("L=%f\nS=%f\n",L,S);
    getchar();
}