how to add comment in c

1A comment in C starts with
2/*
3This is a comment, it ends with
4*/

1// single-line comment
2
3/*
4  multi-line
5  comment
6*/

1// This is a single-line comment
2
3/* This is
4a multi-line
5comment */

1#include stdio.h
2int main(){
3  printf("Only this code will be printed.");
4//This is a single line comment.
5/*
6this is a multiple line 
7comment
8*/
9}