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C++ Pointers and References
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bookAssigning Addresses to Pointers

Pyyhkäise näyttääksesi valikon

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

main.cpp

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#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.

Tehtävä

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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.

  1. 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.
  2. If the transaction is allowed, update the balance by adding amount to *p_balance using pointer dereferencing.
  3. Return true to indicate a successful transaction.

Ratkaisu

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