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import java.util.Scanner;
import static java.lang.Math.*;

 
 
 public class Rational
 {
	
	private int num;
	private int den;

		
	public Rational()
	{
		num = 0;
		den = 1;	
	}
			
	public Rational( int num, int den)
	{
		this.num = num;
		this.den = den;
	}	
	
	public Rational( int wholeNumber )
	{
		Rational( wholeNumber, 1 );
	}	
			
	public String finalDisplay ()
	{
		return Integer.toString(num) + "/" + Integer.toString(den) ;
	}	
	
	
	public void setNum( int num )
	{
		this.num = num;
	}
	
	public void setDen( int den )
	{
		this.den = den;
	}
	
	public int getNum()
	{
		return num;
	}
	public int getDen()
	{
		return den;
	}
	public void scoreInput() 
	{
		Scanner keyboard = new Scanner(System.in);  
		System.out.println("Enter numerator");
		num = keyboard.nextInt();
		System.out.println ("Enter Denomenator");
		den = keyboard.nextInt();
	}

	public static Rational add( Rational a, Rational b ) {
		int den = a.den * b.den;
		int num = a.num * b.den + b.num * a.den;
		return new Rational( num, den );
	}

	public void add( Rational a ) {
		this = add( this, a );
	}
} 

Java

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import java.lang.Math.*;

public class Rational {
	private long m;
	private long n;
	
	public static void main(String args[]) {
		Rational p = new Rational(3,3);
	}
	
	public Rational() { this(0,1); }
	
	public Rational(long a) { this(a,1); }
	
	public Rational(long a, long b) {
		long gcd = this.gcd(a,b);
		
		this.m = a / gcd;
		this.n = Math.abs(b / gcd);
	}
	
	public long getDenominator() { return this.n; }
	public long getNumerator() { return this.m; }

	// Find the Greatest Common Denominator
	private long gcd(long p, long q) {
		p = Math.abs(p);
		q = Math.abs(q);
		long r = p%q;
		while (r > 0) {
			p = q;
			q = r;
			r = p%q;
		}
		return q;
	}
	
	public Rational add(Rational r) {
		long p = this.m * r.getDenominator() + this.n * r.getNumerator();
		long q = this.n * r.getDenominator();
		return new Rational(p, q);
	}
	
	public Rational subtract(Rational r) {
		long p = this.m * r.getDenominator() - this.n * r.getNumerator();
		long q = this.n * r.getDenominator();
		return new Rational(p, q);
	}
	
	public Rational multiply(Rational r) {
		long p = this.m * r.getNumerator();
		long q = this.n * r.getDenominator();
		return new Rational(p, q);
	}
	
	public Rational divide(Rational r) {
		long p = this.m * r.getDenominator();
		long q = this.n * r.getNumerator();
		return new Rational(p, q);
	}
	
	public String toString() {
		if (this.n == 1)
			return "" + this.m;
		return this.m + "/" + this.n;
	}
		
	public int compareTo(Rational r) {
		if (this.equals(r))
			return 0;
		return (this.subtract(r).getNumerator() > 0 ? 1:-1);
	}
	
	// Returns true if and only if obj are the same number or reference the same object
	public boolean equals(Object obj) {
		if (obj == null)
			return false;
		if (obj == this)
			return true;
		if (this.subtract((Rational)obj).getNumerator() == 0)
			return true;
		return false;
	}
}

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