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Functions in C programming

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     A function is defined as a self contained block of statements that performs a particular task. This is a logical unit composed of a number of statements grouped into a single unit. It can also be defined as a section of a program performing a specific task. [Every C program can be though of as a collection of these functions.] Each program has one or more functions. The function main(0 is always present in each program which is executed first and other functions are optional.

 Advantages of using Functions:
The advantages of using functions are as follows:

1. Generally a difficult problem is divided into sub problems and then solved. This divide and conquer technique is implemented in C through functions. A program can be divided into functions, each of which performs some specific task. So, the use of C functions modularizes and divides the work of a program.
2. When some specific code is to be used more than once and at different places in the program, the use of function avoids repetition of that code.
3. The program becomes easily understandable. It becomes simple to write the program and understand what work is done by each part of the program.

4. Functions can be stored in a library and reusability can be achieved.
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