class RationalNumber implements Comparable{
  // Data fields for numerator and denominator
  private int numerator;
  private int denominator;

  /** Default constructor */
  public RationalNumber() {
    this.numerator = 0;
	  this.denominator = 1;
  }

  /** Construct a rational with specified numerator and denominator */
  public RationalNumber(int numerator, int denominator) {
    this.numerator = numerator;
    this.denominator = denominator;
  }

  /** Return numerator */
  public int getNumerator() {
    return numerator;
  }

  /** Return denominator */
  public int getDenominator() {
    return denominator;
  }

  /** Add a rational number to this rational */
  public RationalNumber add(RationalNumber secondRational) {
    int n = numerator*secondRational.getDenominator() +
      denominator*secondRational.getNumerator();
    int d = denominator*secondRational.getDenominator();
    return new RationalNumber(n, d);
  }

  /** Subtract a rational number from this rational */
  public RationalNumber subtract(RationalNumber secondRational) {
    int n = numerator*secondRational.getDenominator()
      - denominator*secondRational.getNumerator();
    int d = denominator*secondRational.getDenominator();
    return new RationalNumber(n, d);
  }

  /** Multiply a rational number to this rational */
  public RationalNumber multiply(RationalNumber secondRational) {
    int n = numerator*secondRational.getNumerator();
    int d = denominator*secondRational.getDenominator();
    return new RationalNumber(n, d);
  }

  /** Divide a rational number from this rational */
  public RationalNumber divide(RationalNumber secondRational){
	  if (secondRational.getNumerator() == 0)
	  {
		  System.out.println("Denominator cannot be zero!");
		  return null;
	  }

    int n = numerator*secondRational.getDenominator();
    int d = denominator*secondRational.getNumerator();
    return new RationalNumber(n, d);
  }
  
  public int compareTo(Object o)
  {
	  RationalNumber rn = null;
	  if(!(o instanceof RationalNumber))
	  {
		  System.out.println("Wrong type comparison");
		  return -100;
	  }
	  else
		  rn = (RationalNumber) o;

	  if ( (numerator / denominator) > (rn.getNumerator() / rn.getDenominator()) )
		  return 1;
	  else if ((numerator / denominator) < (rn.getNumerator() / rn.getDenominator()))
		  return -1;
	  else
		  return 0;      	
  }


  /** Override the toString() method */
  public String toString() {
    if (denominator == 1)
      return numerator + "";
    else
      return numerator + "/" + denominator;
  }
}