C# (CSharp) NumberTools.factorial примеры использования

Пример #1

        public void factorial_of_5_returns_120()
        {
            long result = NumberTools.factorial(5);

            Assert.AreEqual(120, result);
        }

Пример #2

        public void factorial_of_15_returns_1307674368000()
        {
            long result = NumberTools.factorial(15);

            Assert.AreEqual(1307674368000, result);
        }