This C program calculates the area of a circle using its radius.

## Problem Statement

- The program structure starts with the problem statement, followed by the input and output sections.
- The variable declaration, calculation, and formatting of the output remain the same as in the previous program.

## C Program to Find the Area of a Circle

#include <stdio.h> int main() { // Intro printf("C Program to Calculate the Area of a Circle\n"); printf("------------------------------------------\n"); // Problem Statement printf("Given the radius of a circle, this program calculates its area.\n"); // Variables float radius, area; const float PI = 3.14159; // Input printf("\nEnter the radius of the circle: "); scanf("%f", &radius); // Calculation area = PI * radius * radius; // Output printf("\nThe area of the circle with radius %.2f is: %.2f\n", radius, area); return 0; }

## How it works

- We begin by including the necessary header file,
`stdio.h`

, which provides input/output functionality. - Inside the
`main`

function, we declare the variables`radius`

and`area`

as floats, and the constant`PI`

with a value of 3.14159. - We display an introductory message and the problem statement using
`printf`

. - The user is prompted to enter the radius of the circle using
`printf`

. - The value entered by the user is read into the
`radius`

variable using`scanf`

. - The area of the circle is calculated using the formula
`area = PI * radius * radius`

. - Finally, the calculated area is displayed on the screen using
`printf`