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C++ Introduction

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.

main.cpp

main.cpp

example.cpp

example.cpp

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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.

naming.h

naming.h

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1

            
int n; // Bad naming
naming.h

naming.h

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1

            
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.

main.cpp

main.cpp

copy

              
123456789

            
#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
}
question mark

What is the primary purpose of using variables in programming?

Select the correct answer

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Thanks for your feedback!

SectionΒ 3. ChapterΒ 2

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bookUnderstanding Variables

Swipe to show menu

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

main.cpp

main.cpp

example.cpp

example.cpp

copy

              
12345678910

            
#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.

naming.h

naming.h

copy

              
1

            
int n; // Bad naming
naming.h

naming.h

copy

              
1

            
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.

main.cpp

main.cpp

copy

              
123456789

            
#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
}
question mark

What is the primary purpose of using variables in programming?

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 3. ChapterΒ 2
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