Kursusindhold

C++ Pointers and References

1. Pointers Fundamentals

Introduction to Pointer Assigning Addresses to Pointers Link Between Pointer and Variable Pointers Use Cases

2. Pointer Arithmetic

Introduction to Pointer Arithmetic Pointer Arithmetic Practice Arrays and Pointers Connection Array Pointer Arithmetic Practice

3. References Fundamentals

Introduction to References Reference Use Cases Rvalue and Lvalue References Reference vs Pointers

4. Dynamic Memory Allocation

Introduction to Memory Dynamic Allocation Dynamic Allocation of the Array Pointer to Pointer Dynamic Allocation Summary and Overview

Reference vs Pointers

References and pointers provide indirect access to variable values. but they have some key differences, as well as pros and cons.

Syntax

Pointers are declared using the * symbol;
References are declared using the & symbol.

Initialization

You can't declare an empty reference. But you can declare an empty pointer with nullptr.

Reassignment

References can't be re-assigned to refer to a different object.

main.cpp


              12345678910111213
            
#include <iostream>

int main() 
{
    int x = 125, y = 500;
    
    // creating a reference to x variable
    int& ref_x = x;
    ref_x = y; // attempt to re-assigned ref_x
    ref_x = 0;
    
    std::cout << x << ' ' << y;
}

Pointers can be re-assigned to point to different memory locations

main.cpp


              12345678910111213
            
#include <iostream>

int main() 
{
    int x = 125, y = 500;
    
    // creating a pointer to x variable
    int* ptr = &x;
    ptr = &y; // attempt to re-assigned ref_x
    *ptr = 0;
    
    std::cout << x << ' ' << y;
}

Accessing the value

To access the value pointed by a pointer, you use the dereference operator *. For references, you don't need to use any special operator; you simply use the reference variable directly.

Both pointers and references are crucial in memory management, contributing to the flexibility of programs. Their usage depends on the context.

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Sektion 3. Kapitel 4

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Kursusindhold

C++ Pointers and References

1. Pointers Fundamentals

Introduction to Pointer Assigning Addresses to Pointers Link Between Pointer and Variable Pointers Use Cases

2. Pointer Arithmetic

Introduction to Pointer Arithmetic Pointer Arithmetic Practice Arrays and Pointers Connection Array Pointer Arithmetic Practice

3. References Fundamentals

Introduction to References Reference Use Cases Rvalue and Lvalue References Reference vs Pointers

4. Dynamic Memory Allocation

Introduction to Memory Dynamic Allocation Dynamic Allocation of the Array Pointer to Pointer Dynamic Allocation Summary and Overview

Reference vs Pointers

References and pointers provide indirect access to variable values. but they have some key differences, as well as pros and cons.

Syntax

Pointers are declared using the * symbol;
References are declared using the & symbol.

Initialization

You can't declare an empty reference. But you can declare an empty pointer with nullptr.

Reassignment

References can't be re-assigned to refer to a different object.

main.cpp


              12345678910111213
            
#include <iostream>

int main() 
{
    int x = 125, y = 500;
    
    // creating a reference to x variable
    int& ref_x = x;
    ref_x = y; // attempt to re-assigned ref_x
    ref_x = 0;
    
    std::cout << x << ' ' << y;
}

Pointers can be re-assigned to point to different memory locations

main.cpp


              12345678910111213
            
#include <iostream>

int main() 
{
    int x = 125, y = 500;
    
    // creating a pointer to x variable
    int* ptr = &x;
    ptr = &y; // attempt to re-assigned ref_x
    *ptr = 0;
    
    std::cout << x << ' ' << y;
}

Accessing the value

To access the value pointed by a pointer, you use the dereference operator *. For references, you don't need to use any special operator; you simply use the reference variable directly.

Both pointers and references are crucial in memory management, contributing to the flexibility of programs. Their usage depends on the context.

Var alt klart?

Tak for dine kommentarer!

Sektion 3. Kapitel 4