func numberArray(num1: Double, num2: Double) -> (Double, Double, Double, Double) {
var add = 0.0, subtract = 0.0, multiply = 0.0, divide = 0.0
add = num1 + num2
subtract = num1 - num2
multiply = num1 * num2
if num2 == 0 {
divide = 0
} else {
divide = (num1 / num2)
}
return (add, subtract, multiply, divide)
}
numberArray(6, 2)