Question

用C 语言如何在客户端和服务器端来回读写。

Answer 1

#include <stdio.h>
#define PI 3.14
main()
{
double r,len,area;
printf("Please input r:");
scanf("%lf",&r);
len=2*PI*r;
area=PI*r*r;
printf("len=%6.2lf\n area=%6.2lf\n",len,area);}