Pointer Cleaner
The operator delete frees up the allocated memory, but it doesn’t delete the pointer:
12345678910int *x = new int; *x = 42; cout << "Address: " << x << endl; cout << "Value: " << *x << endl; delete x; cout << "Address: " << x << endl; cout << "Value: " << *x << endl;
As you can see, the pointer still remembers the address it refers to. Pointers that point to nonexistent units of memory are called dangling pointers. To avoid problems, you can assign to your pointer nullptr:
x = nullptr;
The keyword nullptr represents the value of the empty pointer. It’s a good practice to assign nullptr to a pointer so as not to crash your program by pointing to the unit of memory you will not use.
Obrigado pelo seu feedback!
Pergunte à IA
Pergunte à IA
Pergunte o que quiser ou experimente uma das perguntas sugeridas para iniciar nosso bate-papo
Pergunte-me perguntas sobre este assunto
Resumir este capítulo
Mostrar exemplos do mundo real
Awesome!
Completion rate improved to 2.94Pointer Cleaner
Deslize para mostrar o menu
The operator delete frees up the allocated memory, but it doesn’t delete the pointer:
12345678910int *x = new int; *x = 42; cout << "Address: " << x << endl; cout << "Value: " << *x << endl; delete x; cout << "Address: " << x << endl; cout << "Value: " << *x << endl;
As you can see, the pointer still remembers the address it refers to. Pointers that point to nonexistent units of memory are called dangling pointers. To avoid problems, you can assign to your pointer nullptr:
x = nullptr;
The keyword nullptr represents the value of the empty pointer. It’s a good practice to assign nullptr to a pointer so as not to crash your program by pointing to the unit of memory you will not use.
Obrigado pelo seu feedback!
