Basic Program Structure of C++.

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Formate of writing a program is called its Structure.The Above picture show the formate of C++ program.

C++ structure is very powerful and easy to understand.

C++ Structure is consists of 3 parts.

Preprocessor Directive
Main() Function
Body of Program / body of main() function.

1-Preprocessor Directives.

Preprocessor directives are the set of instruction given to the compiler before executing the program.

It always start with the '#' symbol and always written at the start of the program.

Example:

#include<iostream.h>

'#include' specify that this a preprocessor.

iostream is the name of standard library function / name of the file.

'.h' is the extension on that file.It specify that this is a header file.

Following are some commonly using Header Files.

#include<iostream>
#include<conio.h>
#include<math.h>

iostream stands for 'input-output stream'.

conio stands for 'console input-output'.

math.h is used to include predefine functions of math.

2-Main() Function.

Main Function is the starting point of a program.Every program must contain a main function,if any program does not contain main() function it can be compiled but can not be executed.All the statements of program can be written in main function.

3-Body of C++ Program.

Body of the program contain statements.These statements written in the curly braces.Braces also known as delimiters.So these statements are the instruction that we give the computer to perform any task.

Computer execute all these statements one by one in sequence.

Program to print 'C++ Programmer' on the Screen by using 'cout'.

#include<iostream.h>

#include<conio.h>

void main()

{

cout<<"C++ Programmer";

getch();

}