• Used to describe program.

• Are ignored by the C compiler a and do not cause any machine language  object code to be generated .

• Text surrounded by /* and */ is ignored by computer

• Comments can be placed any where in the program.

/* This is a C comment*/

/*Comments can across multiple

  lines */

//This is a C++ Comment

• /*  this is not a comment

• */ syntax error

• /* this nested comment  is  /* not  */ valid  */

• /* this is not a comment *./