//
//	P.87
//

class Fraction
{
	private int nume, deno;
	public Fraction()	{ nume=0; deno=1; }
	public Fraction(int n, int d) {	nume=n; deno=d; }
	public void set(int n, int d) {	nume=n; deno=d; }
	public Fraction add(Fraction x)
	{
		Fraction ans = new Fraction();
		int d = deno*x.deno;
		int n = nume*x.deno + deno*x.nume;
		ans.set(n, d);
		return ans;
	}
	public Fraction mul(Fraction x)
	{
		Fraction ans = new Fraction();
		int n = nume * x.nume;
		int d = deno * x.deno;
		ans.set(n, d);
		return ans;
	}
	public void writeOut() { System.out.print(nume+"/"+deno); }

	// driver, or client code in main
	public static void main(String[] args)
	{
		// p.88
		Fraction x = new Fraction(1, 2);	// x=1/2
		Fraction y = new Fraction(3, 4);
		Fraction z = new Fraction();

		z = x.add(y);
		// Q: output x?
		x.writeOut();
		System.out.println();
		y.writeOut();
		System.out.println();
		z.writeOut();
		System.out.println("\n\nDone.\n\n");
	}
}