About C# programming language + simple console calculator app code

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28 Dec 2023
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Starting to program in a new language can be both exciting and daunting. If you're looking to begin your programming journey with C#, you've picked a versatile and powerful language that's great for building all kinds of applications. This article will walk you through the steps to get up and running.

What is C#?

C# (pronounced "C sharp") is a modern, object-oriented programming language developed by Microsoft. It was created for building Windows applications on the .NET framework, but has since grown to support cross-platform development through .NET Core.
Why Choose C#?
C# is popular for several reasons:

  • Versatility: It's used for web, desktop, mobile, game, and cloud application development.
  • Productivity: C# has many features like garbage collection and strong typing that streamline development.
  • Community and Support: As a widely used language, there are tons of developers and learning resources available.


Source : A tour of the C# language

Getting Started with C#

Step 1: Set Up Your Development Environment
You'll need an Integrated Development Environment (IDE). Popular options include:

  • Visual Studio - A full-featured IDE from Microsoft, great for large projects.
  • Visual Studio Code - A lightweight, customizable, open-source editor good for small projects.
  • Rider - A cross-platform .NET IDE from JetBrains supporting many project types.


Step 2: Learn C# Basics

Once you have an IDE, start with the fundamentals:

  • Data types - Work with different data types like strings, ints, bools, etc.
  • Control flow - Learn if statements, switches, loops, and more.
  • OOP - C# is object-oriented, so study classes, objects, inheritance.
  • Error handling - Get to know try/catch blocks for exception handling.


Step 3: Build Simple Projects

Nothing reinforces learning like hands-on practice. Try making:

  • Console apps - Calculator, task list, text game.
  • GUI apps - Add graphics to console apps with Windows Forms or WPF.
  • Web app - Make a web application or API with ASP.NET Core.


Step 4: Study Advanced Topics

Once you're comfortable with the basics, explore more advanced concepts:

  • LINQ - Query and manipulate data more efficiently.
  • Asynchronous programming - Improve performance with async/await.
  • Entity Framework - Simplify database interactions.


Step 5: Join the C# Community

Connecting with other developers can really accelerate your learning:

  • Forums - Stack Overflow, Reddit, Microsoft forums.
  • GitHub - Contribute to open source projects.
  • Meetups/conferences - Attend events locally or globally.

Best Practices

  • Practice constantly - The best way to learn is by doing.
  • Read quality code - Study how experienced devs structure projects.
  • Master debugging - Quickly diagnose and fix code issues.


Starting with C# begins an exciting journey of creation and discovery. It's a powerful, constantly evolving language that requires ongoing learning. By setting up a development environment, learning the fundamentals, gaining hands-on experience, and connecting with the C# community, you'll be well on your way. The key is consistency and eagerness to immerse yourself in programming. Keep coding and enjoy the adventure!

Here is a simple console calculator app in C#:

using System;

namespace CalculatorApp 
{
  class Program 
  {
    static void Main(string[] args)
    {
      Console.Write("Enter first number: ");
      double num1 = Convert.ToDouble(Console.ReadLine());

      Console.Write("Enter operator (+, -, *, /): ");
      string op = Console.ReadLine();

      Console.Write("Enter second number: ");
      double num2 = Convert.ToDouble(Console.ReadLine());

      double result = 0;

      if (op == "+") {
        result = num1 + num2;
      }
      else if (op == "-") {
        result = num1 - num2;
      }
      else if (op == "*") {
        result = num1 * num2;
      }
      else if (op == "/") {
        result = num1 / num2;
      }

      Console.WriteLine("{0} {1} {2} = {3}", num1, op, num2, result);
    }
  }
}

To summarize:

  • Prompt user for two numbers and an operator
  • Store the input in variables num1, op, num2
  • Use if/else if statements to handle each operation
  • Perform the calculation and store result
  • Print out the equation and result

This provides basic +, -, *, / operations for a console calculator app. Additional improvements could include input validation, supporting more operations like modulus, handling division by zero, etc. But this is a simple starting point for a basic calculator program in C#.

Here is an explanation of what each line in the calculator program is doing:

using System;

This imports the System namespace, which contains basic classes like Console that we need.

namespace CalculatorApp  
{

This defines the namespace for the program - CalculatorApp.

class Program
  {

This defines a class called Program inside the CalculatorApp namespace.

static void Main(string[] args)
    {

Main is the entry point method for a C# program. static means it can be called without creating an instance of Program. void means it doesn't return anything.

Console.Write("Enter first number: ");

This prints the prompt to enter the first number to the console.

double num1 = Convert.ToDouble(Console.ReadLine());

This reads the user's input from the console as a string, converts it to a double, and stores in num1.

Console.Write("Enter operator (+, -, *, /): ");
      string op = Console.ReadLine();

Similarly, this prompts for the operator, reads it as a string, and stores in op.

Console.Write("Enter second number: ");
      double num2 = Convert.ToDouble(Console.ReadLine());

Prompts for and reads in the second number just like the first.

double result = 0;

Declares a variable to store the result, initializing it to 0.

if (op == "+") {
        result = num1 + num2;
      }

If the operator is +, perform addition and store in result.

else if (op == "-") {
        result = num1 - num2;
      }

Else if it's -, perform subtraction.

else if (op == "*") {
        result = num1 * num2;
      }

Else if it's *, perform multiplication.

else if (op == "/") {
        result = num1 / num2;
      }

Else if it's /, perform division.

Console.WriteLine("{0} {1} {2} = {3}", num1, op, num2, result);
    }
  }
}

Finally, this prints out the equation and result using string formatting.
So in summary, it takes input, does the math operation, stores the result, and prints it out.

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