public void TestFactorialNegative()
{
var a = new LongInteger("-453453456366656456");
a.Factorial();
Assert.AreEqual("-453453456366656456", a.ToString());
}
public void TestFactorial()
{
var a = new LongInteger("9");
var c = a.Factorial();
Assert.AreEqual("9", a.ToString());
Assert.AreEqual("362880", c.ToString());
a = new LongInteger("100");
c = a.Factorial();
Assert.AreEqual("100", a.ToString());
Assert.AreEqual("93326215443944152681699238856266700490715968264381621468592963895217599993229915608941463976156518286253697920827223758251185210916864000000000000000000000000", c.ToString());
a = new LongInteger("0");
c = a.Factorial();
Assert.AreEqual("0", a.ToString());
Assert.AreEqual("1", c.ToString());
}
