#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);
}