Calculate Area of a Circle in C

Calculate the Area of a Circle in C

This C program calculates the area of a circle based on the radius provided by the user. Below is the code for the program:

#include <stdio.h>
#define PI 3.14159

int main() {
    float radius, area;

    // Input the radius of the circle
    printf("Enter the radius of the circle: ");
    scanf("%f", &radius);

    // Calculate the area of the circle
    area = PI * radius * radius;

    // Display the result
    printf("The area of the circle with radius %.2f is %.2f\\n", radius, area);

    return 0;
}

Explanation

The program starts by including the <stdio.h> header file to utilize input and output functions.

A constant PI is defined with the value 3.14159 for Pi.

In the main function, two floating-point variables, radius and area, are declared.

The program prompts the user to enter the radius of the circle and reads this value using scanf.

The area is then calculated using the formula area = PI * radius * radius, and the result is displayed using printf.