Basic Structure of 'C' Program and Printing Hello,World! in 'C'

The Basic Structure of ‘c’

Like most of the programming languages, C too has a structural approach and hence it has a basic structure.

Here is the basic structure of a typical C program:

1)    DOCUMENTATION

A Typical Program consist s of Documentation, in which the Details regarding the program and the programmer are written in comments.

2)   HEADER FILES: LINK TO THE C LIBRARY

Header Files links the Various Library modules, classes to the program,

Header files Includes methods from C Library with a “#include” command and the function name within < > symbols.

E.g.: include<stdio.h> which includes Standard Input Output Methods to C Program.

3)   DEFINITION

define directive is used to define a variable whose value stays same throughout the program.

E.g.:  #define PI 3.14

4)  GLOBAL DECLARATIONS

The Functions other than main () are declared here in global declaration section

E.g.:  int xyz (int)

5)   MAIN FUNCTION WITH RETURN TYPE

The main function is where the execution of the program starts. The return-type is used to decide whether the function would return a value or not.

¨   Within main (), scope delimiters are used which decides the scope of a program and the body of the programs i.e. statements to be executed are written.

Example:

void main ()

{

//statement of main function

}