Factorial in Scala

Example for versions Simply Scala

This examples shows how to define ! as a method applied to Int. 

def factorial(n: Int): BigInt = 
    if (n == 0) 1 
           else factorial(n - 1) * n
class Factorizer(n: Int) {
    def ! = factorial(n)
}
implicit def int2fact(n: Int) = new Factorizer(n);	

for {i <- List.range(0, 17)} 
    println(i + "! = " + (i!))