package exp5;

public class RationalNumber
{
   private int numerator,denominator;

   public RationalNumber(int numer, int denom)
   {
     if (denom ==0)
        denom = 1;

     if (denom <0)
     {
       numer =numer* -1;
       numer =denom* -1;
     }

     numerator = numer;
     denominator = denom;
     reduce();
   }

   public int getNumerator()
   {
     return numerator;
   }
     
   public int getDenominator()
   {
    return denominator;
   }
   
   public RationalNumber reciprocal()
   {
    return new RationalNumber(denominator,numerator);
   }
    
   public RationalNumber add(RationalNumber op2)
   {
     int commonDenominator = denominator * op2.getDenominator();
     int numerator1 = numerator * op2.getDenominator();
     int numerator2 = op2.getNumerator() * denominator;
     int sum = numerator1 + numerator2;

     return new RationalNumber(sum,commonDenominator);
   }

   public RationalNumber subtract(RationalNumber op2)
   {
     int commonDenominator = denominator * op2.getDenominator();
     int numerator1 = numerator * op2.getDenominator();
     int numerator2 = op2.getNumerator() * denominator;
     int difference = numerator1 -numerator2;

     return new RationalNumber(difference,commonDenominator);
   }

   public RationalNumber multiply(RationalNumber op2)
   {
     int numer = numerator *op2.getNumerator();
     int denom = denominator * op2.getDenominator();

     return new RationalNumber(numer,denom);
   }
   
   public RationalNumber divide(RationalNumber op2)
   {
      return multiply(op2.reciprocal());
   }

   public boolean isLike(RationalNumber op2)
   {
      return (numerator ==op2.getNumerator() &&
              denominator == op2.getDenominator() );
   }

   public String toString()
   {
      String result;
      if(numerator ==0)
        result = "0";
      else 
        if (denominator == 1)
	   result = numerator + "";
	else
          result= numerator + "/"+denominator;
	 return result;
   }

   private void reduce()
   {
      if (numerator !=0)
      {
         int common = gcd(Math.abs(numerator),denominator);

	 numerator = numerator/common;
	 denominator = denominator/common;
      }
   }

   private int gcd(int num1,int num2)
   {
      while (num1 !=num2)
      if (num1>num2)
      num1=num1 - num2;
      else 
      num2 = num2 - num1;

     return num1;
   }
}