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Sunday, 22 February 2015

Basic Structure of C++ Program

                   Basic Structure of C++ Program

The format according to which a computer program is written is called the structure of a program. The basic structure of C++ program includes following main parts:
  1. Preprocessor Directives
  2. The main() Function
  3. C++ Statements

                                      Preprocessor Directives

The instructions that are given to C++ compiler before the beginning of the actual program are called Preprocessor Directives. They are also known as compiler directives.
Important Preprocessor Directives are:
  1. Include
  2. Define

                                         C++ Header Files

It contain the declarations of standard functions. The header files also contain destination of various data types and constants needed by the functions. The extension of a header file is ".h".

                                         The main() Function

It comes after the Preprocessor Directive. The main90 function indicates the beginning of the C++ program. The main() function must be included in every C++ program. When a c++ program is executed, the control goes directly to the main() function and starts executing its statements.

                                          C++ Statements

A program statement is a fundamental unit of any programming languages. It is an instruction for the computer to do something. The statements of C++ program are written under the main() function between the curly brackets. Each statement of C++ program ends with semicolon (;). It is statement terminator. C++ is a case sensitive language.

Written By: Asad Hussain

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