C# Comments


Comments can be used to explain C# code, and to make it more readable. It can also be used to prevent execution when testing alternative code.

Single-line comments start with two forward slashes (//).

Any text between // and the end of the line is ignored by C# (will not be executed).

This example uses a single-line comment before a line of code:


// This is a comment
Console.WriteLine("Hello World!");

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This example uses a single-line comment at the end of a line of code:


Console.WriteLine("Hello World!");  // This is a comment

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C# Multi-line Comments

Multi-line comments start with /* and ends with */.

Any text between /* and */ will be ignored by C#.

This example uses a multi-line comment (a comment block) to explain the code:


/* The code below will print the words Hello World
to the screen, and it is amazing */
Console.WriteLine("Hello World!"); 

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Single or multi-line comments?

It is up to you which you want to use. Normally, we use // for short comments, and /* */ for longer.

C# 练习

Test Yourself With 练习


Insert the missing parts to create two types of comments.

 This is a single-line comment
 This is a multi-line comment 

Start the Exercise

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