Pointer to Pointer Dynamic Allocation
A pointer to pointer, denoted as double pointer (**).
This is a pointer that holds the memory address of another pointer. In simple words, it is a variable whose value is the address of another pointer. This concept might sound complex at first, but it provides a powerful mechanism for dealing with advanced dynamic memory allocation.
Syntax
main.cpp
12345678910111213#include <iostream> int main() { int x = 10; int *ptr1 = &x; int **ptr2 = &ptr1; // Accessing values using double pointer std::cout << "Location of ptr2: " << ptr2 << std::endl; std::cout << "Location of ptr1: " << *ptr2 << std::endl; std::cout << "Value of x: " << **ptr2 << std::endl; }
- ptr1: is a pointer to an integer (
int*); - ptr2: is a double pointer to an integer (
int**).
Dynamic Allocation of a Two-Dimensional Array
If you want to create a two-dimensional array dynamically (at runtime) you have to use a pointer to a pointer for the rows.
And then initialize each row with dynamic array (like in previous chapter)
Swipe to start coding
- Dynamically allocate a two dimensional array.
- Dynamically allocate the arrays as elements.
- Free all allocated memory.
Lösning
solution.cpp
Tack för dina kommentarer!
single
Fråga AI
Fråga AI
Fråga vad du vill eller prova någon av de föreslagna frågorna för att starta vårt samtal
Awesome!
Completion rate improved to 5.88Pointer to Pointer Dynamic Allocation
Svep för att visa menyn
A pointer to pointer, denoted as double pointer (**).
This is a pointer that holds the memory address of another pointer. In simple words, it is a variable whose value is the address of another pointer. This concept might sound complex at first, but it provides a powerful mechanism for dealing with advanced dynamic memory allocation.
Syntax
main.cpp
12345678910111213#include <iostream> int main() { int x = 10; int *ptr1 = &x; int **ptr2 = &ptr1; // Accessing values using double pointer std::cout << "Location of ptr2: " << ptr2 << std::endl; std::cout << "Location of ptr1: " << *ptr2 << std::endl; std::cout << "Value of x: " << **ptr2 << std::endl; }
- ptr1: is a pointer to an integer (
int*); - ptr2: is a double pointer to an integer (
int**).
Dynamic Allocation of a Two-Dimensional Array
If you want to create a two-dimensional array dynamically (at runtime) you have to use a pointer to a pointer for the rows.
And then initialize each row with dynamic array (like in previous chapter)
Swipe to start coding
- Dynamically allocate a two dimensional array.
- Dynamically allocate the arrays as elements.
- Free all allocated memory.
Lösning
solution.cpp
Byt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedanTack för dina kommentarer!
Awesome!
Completion rate improved to 5.88single
