Hello World!

Part of the Fundamentals section of Coddy's C# journey — lesson 2 of 69.

The "Hello World!" is a simple program that outputs Hello World! to the screen.

In C#, we use Console.WriteLine() to print output to the console. The text to be printed is placed within double quotes and enclosed in parentheses.

Every C# program starts from the Main() method — it is the entry point of the program. Your code goes inside Main().

Let's take a look at the "Hello World!" program in C#:

public class Program {
    public static void Main(string[] args) {
        Console.WriteLine("Hello World!");
    }
}

Challenge

Beginner

Use the code view to write a program that outputs Hello World!

Note that anything inside quotation marks is case sensitive. For example:
Console.WriteLine("Hello World!");
Console.WriteLine("hello world!");
are different things (notice the capital letters in the first line).

Cheat sheet

To print to the console in C# use Console.WriteLine():

public class Program {
    public static void Main(string[] args) {
        Console.WriteLine("Hello World!");
    }
}

Try it yourself

using System;

public class Program {
    public static void Main(string[] args) {
        // Write your code below
        
        
    }
}

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

1Introduction

C#Hello World!Comments Basic Program Structure

4Operators Part 1

Arithmetic Operators Modulo Operator Increment/Decrement Post Increment/Decrement Arithmetic Shortcuts

7Basic IO

Basic Output String Interpolation Reading Input Parse Recap - Till 120 Recap - True or False

10Methods (Functions)

Declaring Methods Method Parameters Return Types Optional Parameters Recap - Validation Function Void Methods

13Iterating Over Collections

Using For Loop Foreach Loop Common Array Operations

2Variables Part 1

Numbers Char String Boolean Type Declaration

5Operators Part 2

Comparison Operators Logical Operators Part 1 Logical Operators Part 2 Recap - Simple Logic Logical Operators Part 3

8Calculator App

Welcome Message Getting Numbers

Basic Operations

Formatted Output

11Arrays Basics

Declaring Arrays Accessing Elements Modifying Arrays Array Methods Recap - Product Array Edit Recap - Reversed Array

14Final Challenges

Number Pattern Pattern Finder Student Grade Calculator

3Variables Part 2

Var Constants Naming Conventions Recap - Initialize Variables Type Casting

6Decision Making

If Statement If - Else Switch Statement Ternary Operator Recap - If Else Nested If - Else

9Loops

For Loop While Loop Do While Loop Break Continue Nested Loop Infinite Loop Recap - Dynamic Input

12String Operations

String Methods Part 1 String Methods Part 2 String Formatting