Program to find the area of different shapes | Menu Driven

Write a Menu-driven program to calculate the area of different shapes based on the user choice.

Menu to calculate area of different shapes:

Enter 1 to calculate the area of a circle.
Enter 2 to calculate the area of a triangle.
Enter 3 to calculate the area of a square.
Enter 4 to calculate the area of a rectangle.
Enter 5 to terminate the program.

Formulae for area of different shapes:

Area of a circle = 3.14159265358979323846 * radius * radius
Area of a triangle = (1/2) * base * height
Area of a square = side * side
Area of a rectangle = length * breadth

Approach: To solve the problem, follow the below idea:

The approach is to use Switch-case to make different cases for different choices. The switch case should run until the user enters 5 to terminate the program. Use break statement to avoid fall-through between cases.

Below is the implementation of the approach:

C++

#include <iostream>
using namespace std;

// function to return area of a circle
double getCircleArea(double radius)
{
    return (3.14159265358979323846 * radius * radius);
}

// function to return area of a triangle
double getTriangleArea(double base, double height)
{
    return (base * height * 0.5);
}

// function to return area of a square
double getSquareArea(double side) { return side * side; }

// function to return area of a rectangle
double getRectangleArea(double length, double breadth)
{
    return length * breadth;
}

int main()
{
    bool flag = true;
    while (flag) {
        cout << "Enter 1 to calculate the area of a circle"
             << endl;
        cout
            << "Enter 2 to calculate the area of a triangle"
            << endl;
        cout << "Enter 3 to calculate the area of a square"
             << endl;
        cout << "Enter 4 to calculate the area of a "
                "rectangle"
             << endl;
        cout << "Enter 5 to terminate the program" << endl;
        int choice;
        cin >> choice;
        switch (choice) {
        case 1:
            cout << "Enter radius: ";
            double radius;
            cin >> radius;
            cout << "Area = " << getCircleArea(radius)
                 << endl;
            break;
        case 2:
            cout << "Enter base: ";
            double base, height;
            cin >> base;
            cout << "Enter height: ";
            cin >> height;
            cout << "Area = "
                 << getTriangleArea(base, height) << endl;
            break;
        case 3:
            cout << "Enter side length: ";
            double side;
            cin >> side;
            cout << "Area = " << getSquareArea(side)
                 << endl;
            break;
        case 4:
            cout << "Enter length: ";
            double length, breadth;
            cin >> length;
            cout << "Enter breadth: ";
            cin >> breadth;
            cout << "Area = "
                 << getRectangleArea(length, breadth)
                 << endl;
            break;
        case 5:
            flag = false;
            break;
        default:
            cout << "Invalid Choice" << endl;
        }
    }
    cout << "Program terminated" << endl;
    return 0;
}

Java

import java.util.Scanner;

public class AreaCalculator {
    // function to return area of a circle
    static double getCircleArea(double radius) {
        return Math.PI * radius * radius;
    }

    // function to return area of a triangle
    static double getTriangleArea(double base, double height) {
        return base * height * 0.5;
    }

    // function to return area of a square
    static double getSquareArea(double side) {
        return side * side;
    }

    // function to return area of a rectangle
    static double getRectangleArea(double length, double breadth) {
        return length * breadth;
    }

    public static void main(String[] args) {
        boolean flag = true;
        Scanner scanner = new Scanner(System.in);

        while (flag) {
            try {
                System.out.println("Enter 1 to calculate the area of a circle");
                System.out.println("Enter 2 to calculate the area of a triangle");
                System.out.println("Enter 3 to calculate the area of a square");
                System.out.println("Enter 4 to calculate the area of a rectangle");
                System.out.println("Enter 5 to terminate the program");

                int choice = scanner.nextInt();

                switch (choice) {
                    case 1:
                        System.out.print("Enter radius: ");
                        double radius = scanner.nextDouble();
                        System.out.println("Area = " + getCircleArea(radius));
                        break;
                    case 2:
                        System.out.print("Enter base: ");
                        double base = scanner.nextDouble();
                        System.out.print("Enter height: ");
                        double height = scanner.nextDouble();
                        System.out.println("Area = " + getTriangleArea(base, height));
                        break;
                    case 3:
                        System.out.print("Enter side length: ");
                        double side = scanner.nextDouble();
                        System.out.println("Area = " + getSquareArea(side));
                        break;
                    case 4:
                        System.out.print("Enter length: ");
                        double length = scanner.nextDouble();
                        System.out.print("Enter breadth: ");
                        double breadth = scanner.nextDouble();
                        System.out.println("Area = " + getRectangleArea(length, breadth));
                        break;
                    case 5:
                        flag = false;
                        break;
                    default:
                        System.out.println("Invalid Choice");
                }
            } catch (java.util.NoSuchElementException e) {
                System.out.println("No input provided. Exiting...");
                break;
            }
        }

        System.out.println("Program terminated");
        scanner.close();
    }
}

Python3

import math

# Function to return area of a circle
def get_circle_area(radius):
    return math.pi * radius**2

# Function to return area of a triangle
def get_triangle_area(base, height):
    return 0.5 * base * height

# Function to return area of a square
def get_square_area(side):
    return side**2

# Function to return area of a rectangle
def get_rectangle_area(length, breadth):
    return length * breadth

# Main program
flag = True
while flag:
    print("Enter 1 to calculate the area of a circle")
    print("Enter 2 to calculate the area of a triangle")
    print("Enter 3 to calculate the area of a square")
    print("Enter 4 to calculate the area of a rectangle")
    print("Enter 5 to terminate the program")

    choice = int(input("Enter your choice: "))

    if choice == 1:
        radius = float(input("Enter radius: "))
        print("Area =", get_circle_area(radius))
    elif choice == 2:
        base = float(input("Enter base: "))
        height = float(input("Enter height: "))
        print("Area =", get_triangle_area(base, height))
    elif choice == 3:
        side = float(input("Enter side length: "))
        print("Area =", get_square_area(side))
    elif choice == 4:
        length = float(input("Enter length: "))
        breadth = float(input("Enter breadth: "))
        print("Area =", get_rectangle_area(length, breadth))
    elif choice == 5:
        flag = False
    else:
        print("Invalid Choice")

print("Program terminated")

C#

using System;

public class Scanner : IDisposable
{
    private readonly System.IO.TextReader _reader;
    private string _inputBuffer = string.Empty;

    public Scanner(System.IO.TextReader reader = null)
    {
        _reader = reader ?? Console.In;
    }

    public void Dispose()
    {
        _reader.Dispose();
    }

    public int NextInt()
    {
        return int.Parse(Next());
    }

    public double NextDouble()
    {
        return double.Parse(Next());
    }

    private string Next()
    {
        if (string.IsNullOrEmpty(_inputBuffer))
        {
            _inputBuffer = _reader.ReadLine();
            if (_inputBuffer == null)
            {
                throw new InvalidOperationException("Not enough input.");
            }
        }
        var tokens = _inputBuffer.Split(new[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries);
        if (tokens.Length == 0)
        {
            throw new InvalidOperationException("Not enough input.");
        }
        _inputBuffer = string.Empty;
        return tokens[0];
    }

    public void ClearBuffer()
    {
        _inputBuffer = string.Empty;
    }
}

public class AreaCalculator
{
    // function to return area of a circle
    static double GetCircleArea(double radius)
    {
        return Math.PI * radius * radius;
    }

    // function to return area of a triangle
    static double GetTriangleArea(double baseLength, double height)
    {
        return baseLength * height * 0.5;
    }

    // function to return area of a square
    static double GetSquareArea(double side)
    {
        return side * side;
    }

    // function to return area of a rectangle
    static double GetRectangleArea(double length, double breadth)
    {
        return length * breadth;
    }

    public static void Main(string[] args)
    {
        bool flag = true;
        Scanner scanner = new Scanner();

        while (flag)
        {
            try
            {
                Console.WriteLine("Enter 1 to calculate the area of a circle");
                Console.WriteLine("Enter 2 to calculate the area of a triangle");
                Console.WriteLine("Enter 3 to calculate the area of a square");
                Console.WriteLine("Enter 4 to calculate the area of a rectangle");
                Console.WriteLine("Enter 5 to terminate the program");

                int choice = scanner.NextInt();

                switch (choice)
                {
                    case 1:
                        Console.Write("Enter radius: ");
                        double radius = scanner.NextDouble();
                        Console.WriteLine("Area = " + GetCircleArea(radius));
                        break;
                    case 2:
                        Console.Write("Enter base: ");
                        double baseLength = scanner.NextDouble();
                        Console.Write("Enter height: ");
                        double height = scanner.NextDouble();
                        Console.WriteLine("Area = " + GetTriangleArea(baseLength, height));
                        break;
                    case 3:
                        Console.Write("Enter side length: ");
                        double side = scanner.NextDouble();
                        Console.WriteLine("Area = " + GetSquareArea(side));
                        break;
                    case 4:
                        Console.Write("Enter length: ");
                        double length = scanner.NextDouble();
                        Console.Write("Enter breadth: ");
                        double breadth = scanner.NextDouble();
                        Console.WriteLine("Area = " + GetRectangleArea(length, breadth));
                        break;
                    case 5:
                        flag = false;
                        break;
                    default:
                        Console.WriteLine("Invalid Choice");
                        break;
                }
            }
            catch (InvalidOperationException e)
            {
                Console.WriteLine(e.Message);
                break;
            }
        }

        Console.WriteLine("Program terminated");
    }
}

Javascript

// Function to return area of a circle
function getCircleArea(radius) {
    return Math.PI * Math.pow(radius, 2);
}

// Function to return area of a triangle
function getTriangleArea(base, height) {
    return 0.5 * base * height;
}

// Function to return area of a square
function getSquareArea(side) {
    return Math.pow(side, 2);
}

// Function to return area of a rectangle
function getRectangleArea(length, breadth) {
    return length * breadth;
}

// Main program
let flag = true;
while (flag) {
    console.log("Enter 1 to calculate the area of a circle");
    console.log("Enter 2 to calculate the area of a triangle");
    console.log("Enter 3 to calculate the area of a square");
    console.log("Enter 4 to calculate the area of a rectangle");
    console.log("Enter 5 to terminate the program");

    let choice = prompt("Enter your choice: ");

    if (choice == 1) {
        let radius = parseFloat(prompt("Enter radius: "));
        console.log("Area =", getCircleArea(radius));
    } else if (choice == 2) {
        let base = parseFloat(prompt("Enter base: "));
        let height = parseFloat(prompt("Enter height: "));
        console.log("Area =", getTriangleArea(base, height));
    } else if (choice == 3) {
        let side = parseFloat(prompt("Enter side length: "));
        console.log("Area =", getSquareArea(side));
    } else if (choice == 4) {
        let length = parseFloat(prompt("Enter length: "));
        let breadth = parseFloat(prompt("Enter breadth: "));
        console.log("Area =", getRectangleArea(length, breadth));
    } else if (choice == 5) {
        flag = false;
    } else {
        console.log("Invalid Choice");
    }
}

console.log("Program terminated");

Output:

Enter 1 to calculate the area of a circle
Enter 2 to calculate the area of a triangle
Enter 3 to calculate the area of a square
Enter 4 to calculate the area of a rectangle
Enter 5 to terminate the program
1
Enter radius: 14
Area = 615.752
Enter 1 to calculate the area of a circle
Enter 2 to calculate the area of a triangle
Enter 3 to calculate the area of a square
Enter 4 to calculate the area of a rectangle
Enter 5 to terminate the program
2
Enter base: 10
Enter height: 20
Area = 100
Enter 1 to calculate the area of a circle
Enter 2 to calculate the area of a triangle
Enter 3 to calculate the area of a square
Enter 4 to calculate the area of a rectangle
Enter 5 to terminate the program
3
Enter side length: 10
Area = 100
Enter 1 to calculate the area of a circle
Enter 2 to calculate the area of a triangle
Enter 3 to calculate the area of a square
Enter 4 to calculate the area of a rectangle
Enter 5 to terminate the program
4
Enter length: 5
Enter breadth: 10
Area = 50
Enter 1 to calculate the area of a circle
Enter 2 to calculate the area of a triangle
Enter 3 to calculate the area of a square
Enter 4 to calculate the area of a rectangle
Enter 5 to terminate the program
9
Invalid Choice
Enter 1 to calculate the area of a circle
Enter 2 to calculate the area of a triangle
Enter 3 to calculate the area of a square
Enter 4 to calculate the area of a rectangle
Enter 5 to terminate the program
5
Program terminated

Time Complexity: O(1)
Auxiliary Space: O(1)