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// Lab09bvst.java
// The Rational Class Program II
// This is the student, starting version of the Lab09b assignment.


import java.util.Scanner;


public class RationalLabC
{
	private static int num1, den1;   // numerator and denominator of the 1st rational number
	private static int num2, den2;   // numerator and denominator of the 2nd rational number

	public static void main (String args[])
	{
		enterData();

		Rational r1 = new Rational(num1,den1);
		Rational r2 = new Rational(num2,den2);
		Rational r3 = new Rational();


      r3.multiply(r1,r2);
		System.out.println("\n\n" + r1.getOriginal() + " * " + r2.getOriginal() + "  =  " + r3.getReduced());
		r3.divide(r1,r2);
      System.out.println("\n" + r1.getOriginal() + " / " + r2.getOriginal() + "  =  " + r3.getReduced());

//		100 Point Version Only
//		r3.add(r1,r2);
//		System.out.println("\n" + r1.getOriginal() + " + " + r2.getOriginal() + "  =  " + r3.getReduced());
//		r3.subtract(r1,r2);
//		System.out.println("\n" + r1.getOriginal() + " - " + r2.getOriginal() + "  =  " + r3.getReduced());
		System.out.println();
	}

	public static void enterData()
	{
		Scanner input = new Scanner(System.in);
		System.out.print("\nEnter the 1st numerator ----> ");
		num1 = input.nextInt();
		System.out.print("\nEnter the 1st denominator --> ");
		den1 = input.nextInt();
		System.out.print("\nEnter the 2nd numerator ----> ");
		num2 = input.nextInt();
		System.out.print("\nEnter the 2nd denominator --> ");
		den2 = input.nextInt();
	}
}


class Rational
{
	private int firstNum;	   // entered numerator
	private int firstDen;	   // entered denominator
	private int reducedNum;		// reduced numerator
	private int reducedDen;		// reduced denominator
   private int gcf;
   public Rational()
   {
      firstNum=0;
      firstDen=0;
   }
   public Rational(int x,int y)
   {
      firstNum=x;
      firstDen=y;
   }
   public void multiply(Rational x, Rational y)
   {
   firstNum = x.firstNum*y.firstNum;
   firstDen = x.firstDen*y.firstDen;
   reduce();
   }
   public void divide(Rational x, Rational y)
   {
   firstNum = x.firstNum*y.firstDen;
   firstDen = x.firstDen*y.firstNum;
   }
	public String getOriginal()
   {
   return String.valueOf(firstNum) + "/" + String.valueOf(firstDen);
   }
   private void reduce()
   {
   getGCF(firstNum, firstDen);
   firstNum/=gcf;
   firstDen/=gcf;
   }

   public String getReduced()
   {
   getGCF(firstNum,firstDen);
   return String.valueOf(firstNum/gcf)+"/"+String.valueOf(firstDen/gcf);
   }

	public void getGCF(int n1,int n2)
	{
		int rem = 0;
		do
		{
			rem = n1 % n2;
			if (rem == 0)
				gcf = n2;
			else
			{
				n1 = n2;
				n2 = rem;
			}
		}
		while (rem != 0);
	}


}