// code examples from Scala by Example, chapter 4, 
// factorial and sqrt are in separate sets of files

def scale = 5

def pi = 3.141592653589793

def square(x: Double) = x * x

def sumOfSquares(x: Double, y: Double) = square(x) + square(y)

def loop: Int = loop

def first(x: Int, y: Int) = x

def constOne(x: Int, y: => Int) = 1

def abs(x: Double) = if (x >= 0) x else x

def gcd(a: Int, b: Int): Int = if (b == 0) a else gcd(b, a % b)