C Program To Calculate Circumference of Circle

Given the radius of a Circle, write a C program to calculate circumference of the Circle.

Formula To Calculate Circumference of Circle

circumference = 2 * PI * radius;
Where PI is approximately equal to 3.14

Related Read:
Basic Arithmetic Operations In C

Expected Output for the Input

User Input:
Enter Radius of the Circle
5

Output:
Circumference of the Circle is 31.400002

Video Tutorial: C Program To Calculate Circumference of Circle

Source Code: C Program To Calculate Circumference of Circle

#include<stdio.h>

int main()
{
    const float PI = 3.14;
          float r, c;

    printf("Enter Radius of the Circle\n");
    scanf("%f", &r);

    c = 2 * PI * r;

    printf("Circumference of the Circle is %f\n", c);

    return 0;
}

Output 1:
Enter Radius of the Circle
10
Circumference of the Circle is 62.800003

Output 2:
Enter Radius of the Circle
41
Circumference of the Circle is 257.480011

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