The libraries are

• (Also) called header files
• And, as computer files
• They have the extension “.h”
• house.h
• person.h
• They could have any name

iostream

• Asks the computer to display stuff on the monitor’s screen

How to put a library in your program

• Put it at the beginning of the file (A-1)

Example of (A-1)

iostream.h

How to use a library in your program

• Simply include it by using the word “include” before the name of the library (A-2)

Example of (A-2)

include iostream.h

The pound sign “#”

• Append the sign when you want the computer to “know” that the word “include” means , “I want to include the following library” (A-3)

 
Example of (A-3)

#include iostream.h

There are usually two kinds of libraries or files you will use in your programs

• Libraries that came with C++
• Those that you write

To include your own library

• Enclose it between double quotes (A-4)

Example of (A-4)

#include "books.h"

To include the library that came with C++

• Enclose it between < and > (A-5)

Example of (A-5)

#include <iostream.h>

You can add as many libraries

• As you see fit