Tuesday, 25 October 2016

Chapter 03 - Comments

COMMENTS

Program comments are explanatory statements that you can include in the C++ code that you write and helps anyone reading its source code. All programming languages allow for some form of comments. C++ supports single-line and multi-line comments. All characters available inside any comment are ignored by C++ compiler. 

C++ comments start with /* and end with */. For example:

/* This is a comment */ 
/* C++ comments can also 
* span multiple lines 
*/

A comment can also start with //, extending to the end of the line. For example:

#include<iostream> 
usingnamespace std;
main() 
{ cout <<"Hello World";
// prints Hello World 
return0; }

When the above code is compiled, it will ignore // prints Hello World and final executable will produce the following result:

HelloWorld

Within a /* and */ comment, // characters have no special meaning. Within a // comment, /* and */ have no special meaning. Thus, you can "nest" one kind of comment within the other kind. For example:

/* Comment out printing of Hello World:
cout << "Hello World"; 
// prints Hello World */

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