一个方法实现加减乘除

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)