include<stdio.h>

define PI 3.14

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