Types of Functions

There are two types of functions namely :

1. Library Functions

The declaration of library function is in the header file specified at the beginning of the program.
The definition is in a library file that is automatically linked to the program
Declaration and definition are not required. We will only call the function. Example : clrscr ( )

2. User Defined Functions

Declaration and definition are part of the source file (*.cpp file).
Function definition and declaration have to be written by us.
Example of user defined function is the add function that we saw in the previous section.

The next section deals with : Function Overloading

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