C Program to Find Radius and Circumference of a Circle

#include<stdio.h>

int main()
{
    int radius;
    float PI=3.14,area,ci;

    printf(" Enter the Radius of Circle: ");
    scanf("%d",&radius);

    area = PI * radius * radius;
    printf("\n Area of a Circle : %f ",area);

    ci = 2 * PI * radius;
    printf("\n Circumference of a Circle is : %f ",ci);

    return(0);
}

OUTPUT:

 Enter the Radius of Circle: 5

 Area of a Circle : 78.500000
 Circumference of a Circle is : 31.400002