is it necessary to add a comment to print a text

Question

EX :- cout<<Suvan is enough to print a word
then why should we use //print "Suvan"
cout<<suvan

Answer 1

A comment will NOT print out any code at all, it's unrelated. //This is a comment, and noone will know it even exists.
All a comment does is make code easier to read, as opposed to just random letters and symbols, numbers, and things of the like.

Answer 2

No it is not necessary to add a comment to print a string. However, a string should be between double quotes.