/**Objects represent nonnegative amounts of money*/
public class Money
{
 /**A number of dollars*/
 private long dollars;
 /**A number of cents*/
 private long cents;
 /**Constructor creates a Money object using the amount of money in
 dollars and cents represented with a decimal number
 @param amount the amount of money in the conventional decimal
format*/
 public Money(double amount)
 {
 if (amount < 0)
 {
 System.out.println(
 "Error: Negative amounts of money are not allowed.");
 System.exit(0);
 }
 else
 {
 long allCents = Math.round(amount*100);
 dollars = allCents/100;
 cents = allCents%100;
 }
 }


 public Money(Money otherAmount)
 {
     dollars = otherAmount.dollars;
     cents = otherAmount.cents;

 }

 /**Adds the calling Money object to the parameter Money object.
 @param otherAmount the amount of money to add
 @return the sum of the calling Money object and the parameter
 Money object*/
 public Money add(Money otherAmount)
{
 Money sum = new Money(0);
 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;
 }

 /**Subtracts the parameter Money object from the calling Money
 object and returns the difference.
 @param amount the amount of money to subtract
 @return the difference between the calling Money object and the
 parameter Money object*/
 public Money subtract (Money amount)
 {
 Money difference = new Money(0);
 if (this.cents < amount.cents)
 {
 this.dollars = this.dollars - 1;
 this.cents = this.cents + 100;
 }
 difference.dollars = this.dollars - amount.dollars;
 difference.cents = this.cents - amount.cents;
 return difference;
 }

 public int compareTo(Money amount)
 {
 int value;
if(this.dollars < amount.dollars)
 {
 value = -1;
 }
 else if (this.dollars > amount.dollars)
 {
 value = 1;
 }
 else if (this.cents < amount.cents)
 {
 value = -1;
 }
 else if (this.cents > amount.cents)
 {
 value = 1;
 }
 else
 {
 value = 0;
 }
 return value;
 }

 public boolean equals(Money amount)
  {
    if(this.cents == amount.cents)
    {
      if(this.dollars == amount.dollars)
      {
        return true;
      }
      else
      {
        return false;
      }
    }
    else
    {
      return false;
    }
  }

 public String toString()
 {

        if(this.cents > 10){
             return "$" + this.dollars + "." + this.cents;
            }
        if(this.cents % 10 == 0)
            return "$" + this.dollars + "." + this.cents + "0";
        else{
            return "$" + this.dollars + "." + "0" + this.cents;
        }

     }


}