Functions In C

Introduction to function

Functions in C-Language

Modular Programming:

                The idea of the modular programming came from the hardware manufacturing. Hardware Components are made by different manufacturers. Each component perform specific task. These components combined to make a hardware device.

                In modular programming, a program consists of several independent modules, much like hardware. These modules are called functions. Different functions can be developed by different programmers. These modules are combined to make a complete program.

Unstructured programming Language

                The style of writing programs in which the entire program logic contained in a single unit is called Unstructured programming Language.

Structured programming Language:

                The style of writing programs in which the program logic divided into smaller structures or modules. These modules are combined to make a complete program.

Function:

                A piece of code that is designed to perform a specific task is called Function. It is a complete independent program. It is executed by the main function or any other function in the program.

Importance and Advantages of Function:

1: A large computer program may consist of several hundred statements. If the program is written as one long program then it may difficult to debug or test the program. To make this one easier functions are used. Program divided into smaller section which performs some specific tasks for which they are made.

2: Each function is independent. That’s why it makes program easier.

3: since each function is independent so it is written independently. Thus several programmers can develop large program easier.

4: Use of function reduced overall length of the program.

5: function saves the time.

Types of Functions:

There are two types of function used in C Language.

·         Built-In Function

·         User-Defined Function

Built-In Function:

                The Function that have already been as a part of the language is called built-in function. It is defined and can’t be used for other purposes in c language such as variable etc. it is also called library function. There are 32 function used in c language.

User-Defined Function:

                The functions created by the user are called user-defined function. These are also called programmer-defined function. These are written to perform specific tasks for programs.                     

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