In this program, we will find area of a circle using function.
#include <stdio.h>
#include<conio.h>
int area (int);
void main()
{
int r;
printf("Enter value of r: ");
scanf("%d", &r);
printf("Area of circle is %d", area(r));
}
int area(int r)
{
int area;
area = 3.14 * r * r;
return(area);
}
Enter value of r: 5.2
Area of circle is 78