# C Program To Calculate Area of a Circle

In this post, we will learn how to write a program to calculate the area of a circle in the C Programming language.

A circle is a shape consisting of all points in a plane that are at a given distance from a given point, the center.

The area of a circle is pi times the radius squared (A = π r²), where r is the radius of the circle and π = 3.14(approx).

We will be using the above formula in our program to calculate the area of a circle.

So, without further ado, let’s begin this tutorial.

Contents

## C Program To Calculate Area of a Circle

```// C Program To Calculate Area of a Circle
#include <stdio.h>
int main(){

printf("Enter the radius of the circle: ");

// Calculating area
printf("Area of the circle is: %.2f", area);
return 0;
}
```

Output

``````Enter the radius of the circle: 7
Area of the circle is: 153.86
``````

## How Does This Program Work ?

`    float radius, area;`

In this program, we have declared two float data type variables named radius and area.

```    // Asking for input
printf("Enter the radius of the circle: ");
```

Then, the user is asked to enter the radius of the circle. The value of radius will get stored in the radius named variable.

```    // Calculating area
```

Then, we calculate the area of the circle using the formula π r². The value of π is approximately 3.14.

`    printf("Area of the circle is: %.2f", area);`

Finally, the area of the circle is printed using printf() function. Here we have used %.2f format specifier because we want to display the result only till 2 decimal places.

## Conclusion

I hope after going through this post, you understand how to write a program to calculate the area of a circle in C.

If you have any doubt regarding the program, feel free to contact us in the comment section. We will be delighted to help you.