Factorial

Implement factorial function

Test:

        [TestMethod]
        public void TestFactorial()
        {
            int result = Factorial.Calc(3);
            Assert.AreEqual(6, result);

            int result1 = Factorial.Calc(5);
            Assert.AreEqual(120, result1);
        }




Solution:

    public class Factorial
    {
        public static int Calc(int number)
        {
            if (number > 0)
            {
                return number*Calc(number - 1);
            }
            return 1;
        }
    }

Comments

  1. UnknownJanuary 21, 2014 at 11:20 AM

    for number >= 13 your function will return an incorrect value.
    However one could say that this factorial is by mod 2^32, then while loop is preferable, because of stackoverflow.

    public int factorial(int n){
    int res = n--;
    while(n > 1){
    res *= n--;
    }
    return res;
    }

    ReplyDelete

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