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.

C Program To Calculate Area of a Circle

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.

C Program To Calculate Area of a Circle

// C Program To Calculate Area of a Circle 
#include <stdio.h>
int main(){
    float radius, area;
    
    // Asking for input
    printf("Enter the radius of the circle: ");
    scanf("%f", &radius);
    
    // Calculating area
    area = 3.14 * radius * radius;
    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: ");
    scanf("%f", &radius);

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
    area = 3.14 * radius * radius;

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.

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