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Simple Calculator Using Switch Statement in C#

This C# program implements a basic calculator that allows users to perform arithmetic operations on two numbers using the switch statement.

How the Program Works:
1. The program prompts the user to enter the first number.
2. It then asks for the operation (+, -, *, x, /).
3. The user enters the second number.
4. The program performs the calculation using a switch statement based on the chosen operation.
5. The result is displayed in a formatted output.
6. The program prevents division by zero, displaying an error message if the user attempts it.
7. If the user enters an invalid operation, an error message is displayed.

This exercise helps reinforce user input handling, switch-case structures, and basic arithmetic operations in C#.



Group

C# Basic Data Types Overview

Objective

Write a C# program that asks the user for two numbers and an operation (+, -, *, x, /) and then displays the result.

Note: You MUST use a switch statement, not if.

Example C# Exercise

 Copy C# Code 
using System;

class Program
{
    static void Main()
    {
        // Prompt the user to enter the first number
        Console.Write("Enter the first number: ");
        double num1;
        
        // Validate input
        while (!double.TryParse(Console.ReadLine(), out num1))
        {
            Console.Write("Invalid input. Enter a valid number: ");
        }

        // Prompt the user to enter an operation
        Console.Write("Enter the operation (+, -, *, x, /): ");
        string operation = Console.ReadLine();

        // Prompt the user to enter the second number
        Console.Write("Enter the second number: ");
        double num2;
        
        // Validate input
        while (!double.TryParse(Console.ReadLine(), out num2))
        {
            Console.Write("Invalid input. Enter a valid number: ");
        }

        double result;
        bool validOperation = true;

        // Perform the calculation using a switch statement
        switch (operation)
        {
            case "+":
                result = num1 + num2;
                break;
            case "-":
                result = num1 - num2;
                break;
            case "*":
            case "x": // Accept both '*' and 'x' for multiplication
                result = num1 * num2;
                break;
            case "/":
                if (num2 == 0) // Prevent division by zero
                {
                    Console.WriteLine("Error: Division by zero is not allowed.");
                    return;
                }
                result = num1 / num2;
                break;
            default:
                validOperation = false;
                result = 0;
                break;
        }

        // Display the result or an error message if the operation is invalid
        if (validOperation)
        {
            Console.WriteLine($"{num1} {operation} {num2} = {result}");
        }
        else
        {
            Console.WriteLine("Error: Invalid operation. Please use +, -, *, x, or /.");
        }
    }
}

 Output

//Example 1 (Valid Addition Operation):
Enter the first number: 5
Enter the operation: +
Enter the second number: 7
5 + 7 = 12

//Example 2 (Valid Multiplication with ‘x’):
Enter the first number: 8
Enter the operation: x
Enter the second number: 3
8 x 3 = 24

//Example 3 (Division Attempt by Zero):
Enter the first number: 10
Enter the operation: /
Enter the second number: 0
Error: Division by zero is not allowed.

//Example Execution 4 (Invalid Operation Entered):
Enter the first number: 9
Enter the operation: ^
Enter the second number: 2
Error: Invalid operation. Please use +, -, *, x, or /.

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