Trying to reduce a rational

Question

Hi, I am trying to reduce a rational to its lowest terms after certain arithmetic operations are performed (i.e. add two rationals, subtract two rationals, etc...). I think I have the algorithm but I cannot implement it.
It has to be a private instance method called reduce() (it should reduce the invoking object to its lowest terms). Here is a snippet of my code:
public class Rational
     //private instance variables
     private int numerator;
     private int denominator;
     int num;
     int denom;
     //Default constructor
     public Rational ()
          this(0,1);
     //Another constructor that initializes to num/1
     public Rational (int num)
          this(num,1);
     //Another constructor that initializes to num/denom
     public Rational (int num, int denom)
          this.numerator = num;
          this.denominator = denom;
     //This function will find the Greatest Common Divisor
     private void reduce()
          int tempNum = Math.abs(num);
          int tempDenom = Math.abs(denom);
          int remainder = tempNum % tempDenom;
          while (remainder != 0 )
               tempNum = tempDenom;
               tempDenom = remainder;
               remainder = tempNum % tempDenom;
               num = num / tempDenom;
               denom = denom / tempDenom;
     //This function will get the numerator for the secondRational
     public int getNumerator()
          return numerator;
     //This function will get the denominator for the secondRational
     public int getDenominator()
          return denominator;
     //Add a rational to a secondRational
     public Rational add(Rational secondRational)
          num = (numerator * secondRational.getDenominator()) +
                (denominator * secondRational.getNumerator());
          denom = (denominator * secondRational.getDenominator());
          return new Rational(num,denom);
}So, with the code that I have can I reduce the result after the add operation?

Answer 1

//Add a rational to a secondRational
public Rational add(Rational secondRational)
    num = (numerator * secondRational.getDenominator()) +
          (denominator * secondRational.getNumerator());
    denom = (denominator * secondRational.getDenominator());
    reduce();
    return new Rational(num,denom);