// Class Fraction
// Bob Myers

class Fraction
{
  private int numerator = 0;		// numerator (and keeps sign)
  private int denominator = 1;		// always stores positive value

  public Fraction()
  {

  }

  public Fraction(int n)
  {
    this(n,1);
  }

  public Fraction(int n, int d)
  {
    if (set(n,d)==false)
	set(0,1);
  }

  public boolean set(int n, int d)
  {
    if (d > 0)
    {
	numerator = n;
	denominator = d;
	return true;
    }
    else
	return false;
  }
  
  public void show()
  {
    System.out.print(numerator + "/" + denominator);
  }

  public String toString()
  {
    return (numerator + "/" + denominator);
  }

  public int getNumerator()
  {
    return numerator;
  }

  public int getDenominator()
  {
    return denominator;
  }

  public double decimal()
  {
    return (double)numerator / denominator;
  }

  // more features? -- think some up and add them!

  // sample test program
  public static void main(String[] args)
  {
    Fraction f1, f2;
    f1 = new Fraction();
    f2 = new Fraction(3, 5);

    // Printing out the fraction objects
    System.out.print("\nFraction f1 = ");		  // OKAY
    f1.show();

    // uses toString explicitly
    System.out.print("\nFraction f2 = " + f2.toString()); // BETTER

    // uses toString implicitly
    System.out.print("\nFraction f2 = " + f2);		  // BEST

    System.out.println("\nCalling f1.set(11,14)");
    if (f1.set(11,14) == false)
	System.out.println("** set attempt failed");
    System.out.println("\nCalling f2.set(4,0)");
    if (!f2.set(4,0))
	System.out.println("** set attempt failed");

    System.out.print("\nFraction f1 = ");
    f1.show();
    System.out.print("\nFraction f2 = ");
    f2.show();

    System.out.println("\nDecimal value of f1 = " + f1.decimal());
    System.out.println("Decimal value of f2 = " + f2.decimal());
  }  

}