Question

In C++:

Define a class named Account that stores a balance (monetary amount). The class should have a private double variable balance. Add one accessor getBalance function that returns the balance and one deposit function that increases the balance by a given double amount.

Then subclass Account with a SavingsAccount class. This class should have a private double variable interest. Add an addInterest function that increases the balance (from the superclass Account) according to the interest.

Demonstrate the use in a main function.

Both classes should have a default constructor and a custom constructor, as follows:

public Account() 

public Account(double initial)

public SavingsAccount()

public SavingsAccount(double inter)

Answer 1

Java code

============================================================================================

package sat;
//base class
class Account
{
   private double balance;

   public Account() {
       balance =0;
   }
   public Account(double balance) {
       this.balance = balance;
   }

   public double getBalance() {
       return balance;
   }

   public void deposit(double amount) {
       balance +=amount;
   }
  
}
//sub class
class SavingsAccount extends Account
{
   private double interest;
   public SavingsAccount()
   {
       interest=0;
   }
   public SavingsAccount(double inter)
   {
       interest=inter;
   }
   //add interest
   void addInterest(Account ob)
   {
       double t=ob.getBalance();
       t=t*interest/100;
       ob.deposit(t);
   }
  
}
public class AccountTest {

   public static void main(String[] args) {
       // TODO Auto-generated method stub
      
       Account a=new Account(1000);
       System.out.println("initial balance is "+a.getBalance());
      
       SavingsAccount ob=new SavingsAccount(8.1);
       ob.addInterest(a);
       System.out.println("new balance is "+a.getBalance());
      
      
   }

}

============================================================================================

Output

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