C Program Code to Calculate area and perimeter of circle using radius

/* C Program Code to Calculate area and perimeter of circle using radius */

#include <stdio.h>

int main() {
    float a, p, r;

    printf("Enter the radius of a circle:\n");
    scanf("%f", &r); 

    a = 3.14 * r * r;
    p = 2 * 3.14 * r;

    printf("The area and perimeter of a circle are: %f %f\n", a, p); 

    return 0;
}