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Calculator C# Program Using Command Line Parameters

This C# program allows users to perform basic arithmetic operations such as addition, subtraction, multiplication, or division directly from the command line. The user needs to provide three parameters: the first number, the arithmetic operator (either +, -, *, or /), and the second number. The program will then parse these parameters and execute the corresponding operation, displaying the result on the screen. If the operator is invalid or if the user provides incorrect input, an appropriate error message will be shown.



Group

Functions in C#

Objective

1. Create a C# program that reads command line arguments.
2. The first argument should be a number, the second should be an operator (+, -, *, /), and the third should be another number.
3. Depending on the operator, perform the corresponding arithmetic operation and print the result.
4. Handle errors for invalid input or unsupported operators.

Write a C# program to calculate a sum, subtraction, product or division, analyzing the command line parameters:

calc 5 + 379

(Parameters must be a number, a sign, and another number; allowed signs are + - * x / )

Example C# Exercise

 Copy C# Code 
using System;

class Program
{
    // Main method to process command line arguments
    static void Main(string[] args)
    {
        // Check if exactly three arguments are provided
        if (args.Length != 3)
        {
            Console.WriteLine("Invalid number of parameters. Please provide two numbers and an operator.");
            return;
        }

        // Parse the first and third arguments as numbers
        double num1, num2;
        bool isNum1Valid = double.TryParse(args[0], out num1);
        bool isNum2Valid = double.TryParse(args[2], out num2);

        // Check if both numbers are valid
        if (!isNum1Valid || !isNum2Valid)
        {
            Console.WriteLine("Invalid numbers provided.");
            return;
        }

        // Extract the operator (second argument)
        string operatorSymbol = args[1];

        // Perform the operation based on the operator
        switch (operatorSymbol)
        {
            case "+":
                Console.WriteLine(num1 + num2);
                break;
            case "-":
                Console.WriteLine(num1 - num2);
                break;
            case "*":
            case "x":
                Console.WriteLine(num1 * num2);
                break;
            case "/":
                if (num2 == 0)
                {
                    Console.WriteLine("Error: Division by zero is not allowed.");
                }
                else
                {
                    Console.WriteLine(num1 / num2);
                }
                break;
            default:
                Console.WriteLine("Invalid operator. Allowed operators are +, -, *, x, /.");
                break;
        }
    }
}

 Output

If the input is:
calc 5 + 379

The output will be:
384

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