C Program to find Circumference of a Circle and Semi-circle

Circumference of a Circle formula

Circumference of a Circle = 2 * π * radius

C Program to find the circumference of a circle

This C program gets radius as user inputs and computes the circumference of a circle.

#include<stdio.h>                                                                
                                                                                
void main()
{
    int radius;
    float circumference=0;
    printf("\nFinds circumference of circle\n-------------------");
    printf("\nEnter radius: ");
    scanf("%d", &radius);

    circumference = 2*3.14*radius;

    printf("Circumference of Circle: %.2f", circumference);
}
                                                                                                                                                 

$ cc circumference-of-circle.c
$ ./a.out 

Finds circumference of circle
-------------------
Enter radius: 8
Circumference of Circle: 50.24

Circumference of a Semi-circle formula

Circumference of a Semi-circle =  π * radius

C Program to find the circumference of a semi-circle

This C program gets radius as user inputs and computes the circumference of a semi-circle.

#include<stdio.h>                                                                
                                                                                
void main()
{
    int radius;
    float circumference=0;
    printf("\nFinds circumference of semi-circle\n-------------------");
    printf("\nEnter radius: ");
    scanf("%d", &radius);

    circumference = 3.14*radius;

    printf("Circumference of Semi-circle: %.2f", circumference);
}
                                                                                                                                                 

$ cc circumference-of-semi-circle.c
$ ./a.out 

Finds circumference of semi-circle
-------------------
Enter radius: 8
Circumference of Semi-circle: 25.12