Chapter 10.2, Problem 20STE

Give a definition for the function with the following function declaration. The class BankAccount is defined in Display 10.5. (Hint: It’s easy if you use a member function.)

void doubleUpdate(BankAccount& theAccount); //Precondition: theAccount has previously been given a value //(that is, its member variables have been given values). //Postcondition: The account balance has been changed so that //two years' interest has been posted to the account.