How to execute multiplications and/or divisions in the right order?

Question

I am doing a simple calculator, but when performing the multiplication and division, my code doesn\'t make them a priority over plus and minus. When doing -> 2 + 2 * 4, res

Answer 1

First you have to search in the array to see if there is a ÷ or × sign.

Than you can just sum or subtract.

mutating func calculateTotal() -> Double {
  var total: Double = 0
  for (i, stringNumber) in stringNumbers.enumerated() {
    if let number = Double(stringNumber) {
      switch operators[i] {
      case "÷":
        total /= number
      case "×":
        total *= number
      default:
        break
      }
      //Remove the number from the array and make another for loop with the sum and subtract operations.

    }
  }
  clear()
  return total
}

This will work if you are not using complex numbers.