In single line comment output comes but jn double line comment no output ??

Answer 1

Comments don't generate an output. They are used to leave notes in your code or to disable code.

You probably had something like that:

// I'm a comment!
cout << "This is an output!" << endl;
/* I'm a multiline comment! */

and decided to replace // by /*, without closing with */. In that case, the matching */ will be the one from /* I'm a multiline comment! */, meaning that this whole block will turn into a comment.

Answer 2

//this is a single line comment

/*this is
a multiline
comment*/

Answer 3

but in multiple comment output doesn't come why