3.1.3 Structure of C++ Program, Chapter 3 - Object Oriented Programming in C++, HSSC-II (12th Class) Computer Science Key Point Notes

12th Class (HSSC-II) Computer SLO Based Key Point Notes

(National Book Foundation - As Federal Textbook Board, Islamabad 

Based on National Curriculum Pakistan 2023-2024 and Onward prescribed by Federal Board of Intermediate and Secondary Education, Islamabad, and All Pakistan Boards) 

{Contact WhatsApp # 03339719149 for Class-XII Computer Science Complete SLO-Based Key Points notes in pdf format as well as in PowerPoint Presentation for preparing/delivering the Lectures}

************************************

👉👉👉 Computer Science 12th Class Notes (Main Page)

************************************

Unit 3: Object-Oriented Programming in C++

3.1.3 Structure of C++ Program

The format or way according to which a computer program is written is called the structure of the program.

The basic structure of a C++ program consists of the following main parts:

1. Preprocessor Directives
2. The main() function
3. Program Body (C statements)

Example

Preprocessor Directive

• The instructions given to the C-compiler before the compilation process are called preprocessor Directive.
• They are also known as Compiler Directive.
• They are given at the beginning of the source code.
• They are processed before compiling the source code by a program known as Preprocessor which is a part of a C-compiler.
• Preprocessor Directive begins with a “#” sign.

Following are the important types of preprocessor Directive:
i.    Include directive
ii.   define directive

i. Include directive

The “include preprocessor directive” is used to include header files in the program.

The syntax of using “include directive is as follows 

                            #include < Header file name. h >

Many header files can be included in one program.

ii. Define directive

Define directive is used to define a constant.
It starts with the # symbol.

The syntax of the defined directive is as follows:

            #define identifier expression

Example:
            #define pi 3.14

main() function

• The main() function is the place where the execution of a C program starts.
• Every C program must have the main() function.
• If a program does not contain the main() function, it can be compiled but cannot be executed.
• The body of the main function is enclosed in curly braces { } which contain a statement.

The syntax of the main() function is as follows:

void main(void)
{
        body of the main function which contains statements;
}

👇👇👇👇👇👇👇👇👇👇👇👇

3.1 Introduction to Object-Oriented Programming (OOP):

3.1.1 Computer Program/Software:

3.1.2 Header File and Reserved Words

3.1.3 Structure of C++ Program

3.1.4 C++ program statement Terminator:

3.1.5 Comment statement in C++ Program:

3.2.1 C++ Constants and Variables

3.2.2 Rules for Naming a Variable:

3.2.3 Different C++ data types for variable

3.2.4 The Constant Qualifier (const)

3.2.5 Variable Declaration and Initialization

3.2.6 Type Casting

3.3: Input / Output Handling

3.3.1 The cout Statement

3.3.2 The cin Statement:

3.3.3 The getch() function:

3.3.4 Commonly Used Escape Sequences

3.3.5 Commonly Used Escape Sequences

3.3.6 The Programing with I/O Handling Function

3.3.7 The Manipulators endl and setw

3.4.1 Types of Operator in C++:

3.4.2 UNARY, BINARY AND TERNARY OPERATORS

3.4.3 Order of Precedence of Operator

3.4.4 Expression in C++

4.1.4. The Switch Statement:

Chapter 3 (Complete Key Point Notes)

************************************

👉👉👉 Computer Science 12th Class Notes (Main Page)

************************************

************************************
Shortcut Links For:
1.  5th Class All Subjects Notes
2.  8th Class All Subjects Notes
3.  Easy English Grammar Notes

1. Website for School and College Level Physics   

(https://askrarequiz.blogspot.com)

2. Website for School and College Level Mathematics  

(https://askraremaths.blogspot.com)

3. Website for Single National Curriculum Pakistan - All Subjects Notes 

(https://askrareclassnotes.blogspot.com/)

© 2023 & onwards Academic Skills and Knowledge (ASK)   

Note:  Write me in the comments box below for any query and also Share this information with your class-fellows and friends.