Comments in C

 Comment is the code which is not executable means compiler will not compile the comments and that’s why comments are not visible on output screen.

Two types of Commenting:

Type 1: double slash ‘//’ method the whole statement after double slash is not executed by compiler

Example: try to run below code its output will be blank screen

#include <stdio.h> void main(){ // printf (“Hello World!”); }	#include<stdio.h> void main ( ){ //Comments // Comment printf (“Hello World!”);//abc }	#include<stdio.h> //Comments void main(){ //Comments printf(“Hello World”); }
o/p: blank screen	O/p: Hello World!	O/p: Hello World

In this way you can give multiple comments anywhere in the program but double slash is used to 

comment only single line for commenting multiple lines use type 2. 

Type 2: For multiline commenting or for commenting a whole paragraph from the program we have 

to add /* at the start of comment and */ at the end of comment as shown in examples:

#include <stdio.h> void main(){ /* printf (“Hello World!”); printf (“Hello World!”); */ }	#include<stdio.h> void main ( ){ //Comments /* Comment*/ printf (“Hello World!”);//abc }	#include<stdio.h> /* Comments*/ void main(){ //Comments printf(“Hello World”); }
o/p: blank screen	O/p: Hello World!	O/p: Hello World

In above example at a time // and /**/ comments you can use in code.

Uses of Comments: Comments are optional in program but it is very helpful to write our own notes 

inside the program just for our convenience.