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acegreen/Factorial!

Created September 20, 2016 22:55
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  1. acegreen created this gist Sep 20, 2016.
    24 changes: 24 additions & 0 deletions Factorial!
    View file
    Original file line number Diff line number Diff line change
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    // Mark: - Factorial!

    // Iterative
    func factorialIterative(of number: Int) -> Int {

    var factorial: Int = 1

    for i in 2...number {
    factorial *= i
    }

    return factorial
    }

    print("factorial Iterative", factorialIterative(of: 5))

    // Recursive
    func factorialRecursive(of number: Int) -> Int {
    guard number > 1 else { return 1 }

    return number * factorialRecursive(of: number - 1)
    }

    print("factorial recursive", factorialRecursive(of: 5))