(K&R, §A2.2) The C compiler can accept C++ comments in source code. In a C++ comment, anything that follows // on a line is considered a comment. For example:

a = b; // This is a C++ comment

To turn this feature on, turn off the ANSI Strict setting in the C/C++ Language Panel. If the ANSI Strict setting is on, then this extension to standard C is disabled.

See also: "ANSI Strict."