6.2函数的定义和调用

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#define PI 3.1416

double circu(double r)//函数定义,形参
{
return 2 * PI * r;
}
int main() //主函数
{
double mr, mc; //实参
scanf("%lf", &mr);
mc = circu(mr);
printf("半径为%.2lf的圆的周长为%.2lf\n", mr, mc);
}

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#define PI 3.1416

double circu(double r)//函数定义,形参
{
    return 2 * PI * r;
}
int main()  //主函数
{
    double mr, mc;  //实参
    scanf("%lf", &mr);
    mc = circu(mr);
    printf("半径为%.2lf的圆的周长为%.2lf\n", mr, mc);
}

https://github.com/mzdbxwg/xiao/blob/main/6.2%E5%87%BD%E6%95%B0%E7%9A%84%E5%AE%9A%E4%B9%89%E5%92%8C%E8%B0%83%E7%94%A8