#include<stdio.h>
float area(float r);
void getr(float r);
const PI=3.14159;
int main()
{
int r0;
getr(r0);
area(r0);
return 0;
}
float area(float r)
{
float area;
float area=PI*r*r;
printf("The area is %f",area);
}
void getr(float r)
{
printf("Please input r");
scanf("%f",&r);
}
|