public void TestFrac()
{
TSet <Frac> tset1 = new TSet <Frac>();
tset1.Add(new Frac(1, 2));
tset1.Add(new Frac(2, 3));
tset1.Add(new Frac(3, 4));
Assert.AreEqual(tset1.ElementAt(1), new Frac(2, 3));
Assert.AreEqual(tset1.ElementAt(0), new Frac(1, 2));
Assert.AreEqual(tset1.ElementAt(2), new Frac(3, 4));
}
