Question

c语言编程求圆的面积和周长

c语言编程求圆的面积和周长

Answer 1

#include "stdio.h"
const double PI=3.1415926;
double area(double r)
{
return PI*r*r;
}
double circum(double r)
{
return 2*PI*r;
}
void main()
{
double r;
printf("请输入圆的半径：\n");
scanf("%lf",&r);
printf("圆的面积为：%lf\n",area(r));
printf("圆的周长为：%lf\n",circum(r));

}