3.2.3 Different C++ data types for variable, Chapter3 - Object Oriented Programming in C++, HSSC-II (12th Class) Computer Science Key Point Notes

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

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Unit 3: Object-Oriented Programming in C++

3.2.3  Different C++ data types for variable

Integer

• It is a data type that is used to define numeric variables to store whole numbers, such as -3, 367, +2081, etc.
• The short form of an integer is int.
• The following table shows the integer types:

Floating Point

• It is a data type that is used to define variables that can store numbers that have fractional parts such as 3.75, -2.1, 388.80, etc. These are also known as real numbers.
• The short form of a floating point is float.
• The following table shows different types of floating points:

• In exponential notation, numbers can also be represented. For example, 12345 can be written as 1.2345 x 10⁴. so in a computer program, we can represent it as 1.2345e⁴. Similarly, 0.0098765 is represented in exponential notation as 9.8765e⁻³.

Character

It is a data type that is used to define a variable that can store only a single character.Example: ‘a’, ‘+’, ‘W’, ‘8’, ‘%’ etc.

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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)

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