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C Program to find the Area and Circumference of a Circle

Below is a program to find the area and circumference of a circle.

#include<stdio.h>

int main()
{
    printf("\n\n\t\tStudytonight - Best place to learn\n\n\n");
    int rad;
    float PI = 3.14, area, ci;
    printf("\nEnter the radius of the circle: ");
    scanf("%d", &rad);
    area = PI*rad*rad;
    printf("\n\n\n Area of the circle is: %f ", area);
    ci = 2*PI*rad;
    printf("\n\n\n Circumference of the circle is: %f", ci);
    printf("\n\n\t\t\tCoding is Fun !\n\n\n");
    return 0;
}

Output:

C program output for Area and Circumference of a Circle