Aprenda Assigning Addresses to Pointers

When working with pointers, proper initialization is important to ensure they point to valid memory locations and prevent unexpected behavior.

Address-of and Dereference operators

To assign a value to the pointer we have to use address-of operator and to access the value of the memory address we have to use dereference operator.

&: the address-of operator, returns the memory address of its operand;
*: the derefence operator, returns the value that stored in the memory address.

main.cpp


              12345678
            
#include <iostream>

int main()
{
	int variable = 10;
	std::cout << &variable << std::endl;
	std::cout << *(&variable) << std::endl;
}

Using the address-of operator, we can assign these addresses to pointers, creating a direct link between the pointer and the memory location it points to.

Tarefa

Swipe to start coding

In a banking system, each customer has an account balance. Transactions such as deposits or withdrawals can change this balance. However, withdrawals cannot make the balance negative. Write a program that updates and manages the account balance using pointers.

You will implement a function updateBalance that performs the transaction by modifying the balance through a pointer.

Inside the updateBalance function, check if the transaction is a withdrawal that would result in a negative balance:
- If amount is negative and *p_balance + amount < 0, the transaction is not allowed.
- Return false in this case.
If the transaction is allowed, update the balance by adding amount to *p_balance using pointer dereferencing.
Return true to indicate a successful transaction.

Solução

Tudo estava claro?

Obrigado pelo seu feedback!

Seção 1. Capítulo 2

single

Pergunte à IA

Pergunte o que quiser ou experimente uma das perguntas sugeridas para iniciar nosso bate-papo

Suggested prompts:

Can you give an example of how to use the address-of and dereference operators?

What happens if I try to dereference an uninitialized pointer?

Why is it important to initialize pointers before using them?

Awesome!

Completion rate improved to 5.88

Deslize para mostrar o menu