Comments

The first program we showed you included a line describing what part of the code does.

class Program
{
    static void Main(string[] args)
    {
        // Displays "Hello World!" on the terminal.
        System.Console.WriteLine("Hello World!");
    }
}

Most programming languages support comments, snippets of text that you can insert into your code that are meant for humans to read, not the computer. C# supports comments, too.

• Let's suppose you have some code, and you think it won't be immediately obvious to other developers what it does.
• You can't just start typing an explanation. C# will think the text is part of your program, and try to run it, which won't work.
• Instead, you need to mark the text as something that shouldn't be run.
• If you insert two slashes (//) into your code, C# will ignore all the text from there to the end of the line.
• You can do this on a line by itself.
• Or, you can do it at the end of a line of code.

// Comment
System.Console.WriteLine("Hello World!"); // Comment 

You can use this to leave useful comments throughout your code. Anytime you write some code where the meaning isn't immediately obvious, you can add a comment that explains the code.

        // Displays "Hello World!" on the terminal.
        System.Console.WriteLine("Hello World!");