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You can include comments in C++ programs in two ways.
First, whenever the C++ compiler encounters two adjacent forward slashes,
//, C++ ignores both the slashes and the rest of the line on
which the slashes appear:
// Short comment.
Second, whenever C++ encounters a slash followed
immediately by an asterisk, /*, C++ ignores both
the /*
characters and all other characters up to and including the next
asterisk followed immediately by a slash, */.
/* Long comment ... that just goes on ... and on ... */
If you wish to test how a program works without certain lines of source code, you can hide those lines in a comment, instead of deleting them.