calc.txt

using System;

class Calculator
{
    static void Main()
    {
        double num1, num2, result;
        char operation;

        Console.WriteLine("Enter the first number: ");
        num1 = double.Parse(Console.ReadLine());

        Console.WriteLine("Enter the second number: ");
        num2 = double.Parse(Console.ReadLine());

        Console.WriteLine("Enter the operation (+, -, *, /): ");
        operation = char.Parse(Console.ReadLine());

        switch (operation)
        {
            case '+':
                result = num1 + num2;
                Console.WriteLine("The result is: " + result);
                break;

            case '-':
                result = num1 - num2;
                Console.WriteLine("The result is: " + result);
                break;

            case '*':
                result = num1 * num2;
                Console.WriteLine("The result is: " + result);
                break;

            case '/':
                if (num2 != 0)
                {
                    result = num1 / num2;
                    Console.WriteLine("The result is: " + result);
                }
                else
                {
                    Console.WriteLine("Cannot divide by zero.");
                }
                break;

            default:
                Console.WriteLine("Invalid operation.");
                break;
        }
    }
}