C#: A menu-driven program for a simple calculator

C# Sharp Conditional Statement: Exercise-25 with Solution

Write a program in C# Sharp which is a menu-driven program to perform simple calculations.

Sample Solution:-

C# Sharp Code:

using System;  // Importing necessary namespace

public class Exercise25  // Declaration of the Exercise25 class
{  
    public static void Main()  // Main method, entry point of the program
    {
        int num1, num2, opt;  // Declaration of variables to store integers and user's choice

        Console.Write("\n\n");  // Displaying new lines
        Console.Write("A menu driven program for a simple calculator:\n");  // Displaying the purpose of the program
        Console.Write("------------------------------------------------");  // Displaying a separator
        Console.Write("\n\n");

        Console.Write("Enter the first Integer :");  // Prompting the user to enter the first integer
        num1 = Convert.ToInt32(Console.ReadLine());  // Reading the first integer from user input
        Console.Write("Enter the second Integer :");  // Prompting the user to enter the second integer
        num2 = Convert.ToInt32(Console.ReadLine());  // Reading the second integer from user input

        Console.Write("\nHere are the options :\n");  // Displaying available calculation options
        Console.Write("1-Addition.\n2-Subtraction.\n3-Multiplication.\n4-Division.\n5-Exit.\n");
        Console.Write("\nInput your choice :");  // Prompting the user to input their choice
        opt = Convert.ToInt32(Console.ReadLine());  // Reading the user's choice

        switch (opt)  // Switch statement based on the user's choice
        {
            case 1:  // Addition
                Console.Write("The Addition of {0} and {1} is: {2}\n", num1, num2, num1 + num2);
                break;
            case 2:  // Subtraction
                Console.Write("The Subtraction of {0} and {1} is: {2}\n", num1, num2, num1 - num2);
                break;
            case 3:  // Multiplication
                Console.Write("The Multiplication of {0} and {1} is: {2}\n", num1, num2, num1 * num2);
                break;
            case 4:  // Division
                if (num2 == 0)  // Checking if division by zero
                {
                    Console.Write("The second integer is zero. Divide by zero.\n");
                }
                else
                {
                    Console.Write("The Division of {0} and {1} is : {2}\n", num1, num2, num1 / num2);
                }
                break;
            case 5:  // Exit
                break;
            default:  // Handling incorrect option
                Console.Write("Input correct option\n");
                break;
        }
    }
}

Sample Output:

A menu driven program for a simple calculator:                                                                
------------------------------------------------                                              
Enter the first Integer :20                                                                                   
Enter the second Integer :4                                                                                   
                                                                                                              
Here are the options :                                                                                        
1-Addition.                                                                                                   
2-Substraction.                                                                                               
3-Multiplication.                                                                                             
4-Division.                                                                                                   
5-Exit.                                                                                                       
                                                                                                              
Input your choice :4                                                                                          
The Division of 20  and 4 is : 5  

Flowchart:

C# Sharp Code Editor:

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