C++ Functions and its Prototypes

A function groups a number of program statements into a unit and provides it a name. This unit could then be invoked from other categories of the program.  It is used to decrease program size. The function's code is stored in just one place in memory; even by the function is executed several times in the course of program.

The major advantages of using a function are:

1.   Simple to write a correct small function

2.   Simple to read, write and debug a function

3.   simpler to manage or modify such a function

4.   Small functions tend to be itself documenting and highly readable

5.   It can be called any number of times in any place with different parameters