Different Types of functions in C/C++ ?

            Function types

            There are two types of functions which are as follow:

1.      User-defined Functions

2.      Built-in Functions

User-defined function

User-defined function is a function that is defined by the user. A program may have many user-defined functions or may not have user-defined functions.

Example:

int odd(int);

 int even(int);

Built-in functions

Built-in function is a function which already exists in any programming language.

It is also called as library function.

Example:

cin>>, cout>>