Basic structure of C language ( Module 2).

The program written in C language follows this basic structure. The sequence of sections should be as they are in basic structure. A C programs should have one or more sections but the sequence of sections is to be followed.

It comes first and is used to document the use of logic or reasons in the program. It can be used to write the program's objective, developer and logic details. The documentation section is done in C language with /* and */ whatever is written in between these two are called comments. 

This section tells the compiler to link the certain occurrence of keywords or function in our program to the header files specified in this section. 

It is used to declare some constants and assign them some value. Eg. #define max 25. Here #define is a compiler directives which tells the conpiler whenever max is found in the program replace it with 25. 

Here the variables which are used throughout the program (including main and other functions)  are declared so as to make them global. 

It tells the compiler where to start the execution from.    

main()    

{ point from execution starts }. 

1. Declaration section : In this the variables and their data types are declared. 

2. Executable section : This has the part of program which actually performs the task we need. 

This has all the sub programs or the functions which our program needs.