public static void Main(String[] args)
{
Rat r1 = new Rat(3, 4);
Rat r2 = new Rat(5, 6);
Console.WriteLine(r1 + " + " + r2 + " = " + (r1 + r2));
Console.WriteLine(r1 + " == " + r2 + " = " + (r1 == r2));
Console.WriteLine(r1 + " != " + r2 + " = " + (r1 != r2));
Console.WriteLine("Hash of " + r1 + " = " + r1.GetHashCode());
Console.WriteLine(r1 + " + " + 7 + " = " + (r1 + 7));
}
public void TestMethod2()
{
try
{
Rat r = new Rat(1, 0);
Assert.Fail();
}
catch (ArgumentException)
{
}
}
public void TestMethod3()
{
Rat r = new Rat(1, 0);
}
public void TestMethod1()
{
Rat r = new Rat(3, 6);
Assert.AreEqual("1/2", r.ToString());
}
// Note how this method defines a new operator. Also note
// the use of the checked block. Without it, the
// arithmetic overflows within would be ignored.
/// <summary>
/// Returns the sum of r1 and r2.
/// </summary>
/// <exception cref="System.OverflowException">When arithmetic overflow</exception>
public static Rat operator +(Rat r1, Rat r2)
{
Debug.Assert(r1.RI());
Debug.Assert(r2.RI());
checked
{
Rat result = new Rat(r1.num * r2.den + r1.den * r2.num,
r1.den * r2.den);
Debug.Assert(result.RI());
Debug.Assert(r1.RI());
Debug.Assert(r2.RI());
return result;
}
}
