Area of circle and Circumference

#include<stdio.h>

int main()
{

    int rad;
    float PI = 3.14, area, ci;

    printf("\nEnter radius of circle: ");
    scanf("%d", &rad);

    area = PI * rad * rad;
    printf("\nArea of circle : %f ", area);

    ci = 2 * PI * rad;
    printf("\nCircumference : %f ", ci);

    return 0;
}

Output : 

Enter radius of circle: 3

Area of circle : 28.260000
Circumference : 18.840000