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C++ Introduction
course content

Course Content

C++ Introduction

C++ Introduction

1. Getting Started
What is C++Entry Point of a ProgramStandard Library and FilesPreprocessor DirectivesThe First Program
2. Introduction to Operators
Operators IntroductionArithmetic Operators PracticeRelational OperatorsLogical Operators
3. Variables and Data Types
Data TypesUnderstanding VariablesNumerical Data TypesIntroduction to StringIntroduction to ArraysWorking with the Array
4. Introduction to Program Flow
Conditional StatementsTernary OperatorSwitch StatementWhile LoopFor LoopPracticing With Loops
5. Introduction to Functions
What are Functions?Type of FunctionsReturn Statement in Functions Simple Function Practice

bookUnderstanding Variables

Variables play an important role in storing and manipulating data. The process of creating a variable involves two essential steps: declaration and initialization.

cpp

main

cpp

example

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#include <iostream>

int main()
{
    // Declaration is process of introducing a variable and giving it a name
  	int x;

    // Initialization is the assigning a value to a declared variable.  
    x = 25; 
}

Also when declaring multiple variables that hold the same type of data, it is convenient to specify the data type only once.

Naming Conventions

Choosing meaningful and descriptive names for variables is crucial for writing maintainable and understandable code.

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int n; // Bad naming
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int numberOfStudents; // Good naming

Variable names in C++ can consist of letters and numbers but cannot start with numbers, nor can they contain spaces or arithmetic operators. Also avoid using names that coincide with reserved keywords. This can lead to compilation errors.

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main

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#include <iostream>

int main()
{
    int int = 25;                 // Uses reserved keyword
    int email!number = 25;        // Contains a special character
    int my age = 37;              // Contains space
    int 121A = 121;               // Starts with digit
}
What is the primary purpose of using variables in programming?

What is the primary purpose of using variables in programming?

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Section 3. Chapter 2
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