include<stdio.h>

define PI 3.14

double calculateSquare(int radius);
int main ()
{
int cRadius = 0;
double square=0.0;
printf("请输入圆的半径:\n");
scanf ("%d",&cRadius);
square=calculateSquare(cRadius);
printf("圆的面积是:%f\n",square);
return 0;
}
double calculateSquare(int radius)
{
double result = PIradiusradius ;