import java.util.Scanner;

/**
 Class representing nonnegative amounts of money,
 such as $100, $41.99, $0.05.
*/
public class Money
{
    private long dollars;
    private long cents;

    public void set(long newDollars)
    {
        if (newDollars < 0)
        {
            System.out.println(
                 "Error: Negative amounts of money are not allowed.");
            System.exit(0);
        }
        else
        {
            dollars = newDollars;
            cents = 0;
        }
    }

    public void set(double newAmount)
    {
        if (newAmount < 0)
        {
            System.out.println(
                 "Error: Negative amounts of money are not allowed.");
            System.exit(0);
        }
        else
        {
            long allCents = Math.round(newAmount * 100);
            dollars = allCents / 100;
            cents = allCents % 100;
        }
    }

    public void set(Money moneyObject)
    {
        this.dollars = moneyObject.dollars;
        this.cents = moneyObject.cents;
    }

    /**
     Precondition: The argument is an ordinary representation
     of an amount of money, with or without a dollar sign.
     Fractions of a cent are not allowed.
    */
    public void set(String amountString)
    {
        String dollarsString;
        String centsString;
		
        //Delete '$' if any:
        if (amountString.charAt(0) == '$')
            amountString = amountString.substring(1);
        amountString = amountString.trim( );
		
        //Locate decimal point:
        int pointLocation = amountString.indexOf(".");
        if (pointLocation < 0) //If no decimal point
        {
            cents = 0;
            dollars = Long.parseLong(amountString);
        }
        else //String has a decimal point.
        {
            dollarsString =
                    amountString.substring(0, pointLocation);
            centsString =
                    amountString.substring(pointLocation + 1);
			 //one digit in cents means tenths of a dollar		
            if (centsString.length( ) <= 1)
                centsString = centsString + "0";
				
			// convert to numeric	
            dollars = Long.parseLong(dollarsString);
            cents = Long.parseLong(centsString);
            if ((dollars < 0) || (cents < 0) || (cents > 99))
            {
                System.out.println(
                   "Error: Illegal representation of money.");
                System.exit(0);
            }
        }
     }

    public void readInput( )
    {
        System.out.println("Enter amount on a line by itself:");
        Scanner keyboard = new Scanner(System.in);
        String amount = keyboard.nextLine( );
        set(amount.trim( ));
    }

     /**
      Does not go to the next line after displaying money.
     */
     public void writeOutput( )
     {
         System.out.print("$" + dollars);
         if (cents < 10)
             System.out.print(".0" + cents);
         else
             System.out.print("." + cents);
     }

     /**
      Returns n times the calling object.
     */
     public Money times(int n)
     {
         Money product = new Money( );
         product.cents = n * cents;
         long carryDollars = product.cents / 100;
         product.cents = product.cents % 100;
         product.dollars = n * dollars + carryDollars;
         return product;
     }

     /**
      Returns the sum of the calling object and the argument.
     */
     public Money add(Money otherAmount)
     {
         Money sum = new Money( );
         sum.cents = this.cents + otherAmount.cents;
         long carryDollars = sum.cents / 100;
         sum.cents = sum.cents % 100;
         sum.dollars = this.dollars
                      + otherAmount.dollars + carryDollars;
         return sum;
     }
 }