## C Program to calculate Area and Circumference of Circle

June 5, 2021 Here we are writing a simple C program that calculates the area and circumference of circle based on the radius value provided by user.

Formula:
Area = 3.14 * radius * radius
Circumference = 2 * 3.14 * radius

## Program to calculate Area and Circumference based on user input

To calculate area and circumference we must know the radius of circle. The program will prompt user to enter the radius and based on the input it would calculate the values. To make it simpler we have taken standard PI value as 3.14 (constant) in the program. Other details are mentioned as comments in the below example program.

```#include <stdio.h>
int main()
{
float PI_VALUE=3.14, circle_area, circle_circumf;

//Ask user to enter the radius of circle
printf("\nEnter radius of circle: ");
//Storing the user input into variable circle_radius

//Calculate and display Area
circle_area = PI_VALUE * circle_radius * circle_radius;
printf("\nArea of circle is: %f",circle_area);

//Caluclate and display Circumference
circle_circumf = 2 * PI_VALUE * circle_radius;
printf("\nCircumference of circle is: %f",circle_circumf);

return(0);
}```

Output:

```Enter radius of circle: 2
Area of circle is: 12.560000
Circumference of circle is: 12.560000```