Single Line Comments
Single line comments start with //.
This example uses a single-line comment before each code line:
This example uses a single line comment at the end of each line to explain the code:
Multi-line comments start with /* and end with */.
This example uses a multi-line comment (a comment block) to explain the code:
It is most common to use single line comments. Block comments are often used for formal documentation.
Using Comments to Prevent Execution
Using comments to prevent execution of code is suitable for code testing.
Adding // in front of a code line changes the code lines from an executable line to a comment.
This example uses // to prevent execution of one of the code lines:
This example uses a comment block to prevent execution of multiple lines: