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C++ Introduction
course content

Course Content

C++ Introduction

C++ Introduction

1. Getting Started
Why to Learn C++What is C++Entry Point of a ProgramStandard Library and FilesPreprocessor DirectivesThe First Program
2. Variables and Data Types
Introduction to VariablesData TypesNumerical Data TypesIntroduction to StringIntroduction to ArraysKeywords sizeof(), auto and typedefWorking with the Array
3. Introduction to Operators
Simple OperatorsA Little MathLogical OperatorsCompound Assignment OperatorPracticing Math Basics
4. Introduction to Program Flow
If...else StatementTernary OperatorSwitch StatementWhile LoopDo...while LoopFor LoopFibonacci Number with Loops
5. Introduction to Functions
What are Functions?Type of FunctionsReturn Statement in FunctionsFunctions With Arguments Simple Function

bookIntroduction to Variables

In the realm of programming languages, variables play an important role in storing and manipulating data. The process of creating a variable involves two essential steps: declaration and initialization.

  • Declaration: the process of introducing a variable to the compiler. It involves specifying the variable's data type and, optionally, giving it a name;
  • Initialization: the process of assigning a value to a declared variable. It is crucial to prevent the variable from containing unpredictable or garbage values.
cpp

main

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#include <iostream>

int main()
{
  	int x; // Declaration
	x = 25; // Initialization
  	std::cout << "My first variable: x = " << x;
}

Note

You can provide an initial value to the variable at the time of declaration.

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.

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.

What is the primary purpose of using variables in programming?

What is the primary purpose of using variables in programming?

Select the correct answer

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Section 2. Chapter 1
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