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==Adding Comments==

Comments in a C program have a starting point and an ending point.
Everything between those two points is ignored by the compiler.

<source lang="cpp">/* This is how a comment looks in the C language */</source>

==Source code header comments==

<OL><LI>At the beginning of the program is a comment block.</LI><LI>The comment block contains information about the program.</LI><LI>Boxing the comments makes them stand out.</LI></OL>
The some of the sections as follows should be included.
<OL><LI>Heading.</LI><LI>Author.</LI><LI>Purpose.</LI><LI>Usage.</LI><LI>References.</LI><LI>File formats. A short description of the formats which will be used in the program.</LI><LI>Restrictions.</LI><LI>Revision history.</LI><LI>Error handling.</LI><LI>Notes. Include special comments or other information that has not already been covered.</LI></OL>

<source lang="cpp">/********************************************************
* hello -- program to print out "Hello World". *
* *
* Author: FirstName, LastName *
* *
* Purpose: Demonstration of a simple program. *
* *
* Usage: *
* Runs the program and the message appears. *
********************************************************/
#include <stdio.h>
int main()
{
/* Tell the world hello */
printf("Hello World\n");
return (0);
}</source>
<pre class=codeResult>Hello World</pre>

==The comments are enclosed in "/*...*/"==

<source lang="cpp">#include <stdio.h>
main(){
printf("Hi \n"); /* This is the comments.*/
}</source>
<pre class=codeResult>Hi</pre>

==The "//" is used as single line comment==

<source lang="cpp">#include <stdio.h>
main(){
int i,j,k;

i = 6;
j = 8;
k = i + j;

printf("sum of two numbers is %d \n",k); // end of line comment
}</source>
<pre class=codeResult>sum of two numbers is 14</pre>

==Using Comments to Disable==

Comments are ignored by the compiler.
You can use comments to disable certain parts of your program.

<source lang="cpp">#include <stdio.h>

int main(){

/* printf("%15s","right\n"); */
printf("%-15s","left\n");
return(0);
}</source>
<pre class=codeResult>left</pre>

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