Create an Calculator for Find Area of Circle, Square, and Rectangle in C Language with Free Codes

Index

Introduction – Calculator

Here are we are going to create an Calculator which we can use for Find Area of Circle, Area of Square, and Area of Rectangle. This is Basic Level Project for every C Language Developer.

Constants

Here we used constant “PI” which is used for defined the value of π.

Functions

Here we used three different Functions for Creating a different Formula for Calculation, here is it

• calculateCircleArea(): This function calculates and prints the area of a circle. It prompts the user to enter the radius and uses the formula,

• calculateRectangleArea(): This function calculates and prints the area of a rectangle. It prompts the user to enter the length and width, and uses the formula,

• calculateSquareArea() : This function calculates and prints the area of a square. It prompts the user to enter the side length and uses the formula,

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Output – Calculator

Output of the Project,

Area Calculator
1. Circle
2. Square
3. Rectangle
4. Exit
Choose a shape to calculate the area (1-4): 1 
Enter the radius of the circle: 78

The area of the circle is: 19113.45

Project Codes

Here is the Complete Project Codes,

#include <stdio.h>
#include <math.h>

#define PI 3.14159265358979323846

void calculateCircleArea() {
    float radius, area;
    printf("Enter the radius of the circle: ");
    scanf("%f", &radius);
    area = PI * radius * radius;
    printf("The area of the circle is: %.2f\n", area);
}

void calculateSquareArea() {
    float side, area;
    printf("Enter the side length of the square: ");
    scanf("%f", &side);
    area = side * side;
    printf("The area of the square is: %.2f\n", area);
}

void calculateRectangleArea() {
    float length, width, area;
    printf("Enter the length of the rectangle: ");
    scanf("%f", &length);
    printf("Enter the width of the rectangle: ");
    scanf("%f", &width);
    area = length * width;
    printf("The area of the rectangle is: %.2f\n", area);
}

int main() {
    int choice;

    while (1) {
        printf("\nArea Calculator\n");
        printf("1. Circle\n");
        printf("2. Square\n");
        printf("3. Rectangle\n");
        printf("4. Exit\n");
        printf("Choose a shape to calculate the area (1-4): ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                calculateCircleArea();
                break;
            case 2:
                calculateSquareArea();
                break;
            case 3:
                calculateRectangleArea();
                break;
            case 4:
                printf("Exiting...\n");
                return 0;
            default:
                printf("Invalid choice. Please choose a valid option (1-4).\n");
        }
    }

    return 0;
}

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