There are two ways to insert comments into program.A comment can begin with the two characters //, in which case any characters that follow on the line are ignored by the compiler.

A comment can also begin with the two characters /* and end when the characters */ are encountered.Any characters can be included inside the comment, which can extend over multiple lines of the program.A comment can be used anywhere in the program where a blank space is allowed. Comments, however, cannot be nested, which means that the first */ characters encountered end the comment, no matter how many /* characters you use.