From 6fff73b8b6c7f64c11f4275cedfd54bcffa2b6e5 Mon Sep 17 00:00:00 2001
From: Pin Lin <moneycat711@gmail.com>
Date: Wed, 6 May 2020 09:43:57 +0800
Subject: [PATCH] =?UTF-8?q?=E6=94=B9=E5=90=8D=E6=88=90=20tempFormula=20?=
 =?UTF-8?q?=E6=AF=94=E8=BC=83=E7=9F=AD?=
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---
 AndroidCalculator/Calculator.swift | 55 +++++++++++++++---------------
 1 file changed, 27 insertions(+), 28 deletions(-)

diff --git a/AndroidCalculator/Calculator.swift b/AndroidCalculator/Calculator.swift
index d3783fe..5db5ed1 100644
--- a/AndroidCalculator/Calculator.swift
+++ b/AndroidCalculator/Calculator.swift
@@ -27,55 +27,54 @@ class Calculator {
         return ""
       }
       
-      var calculatingFormula = formula
-      if ["+", "-", "×", "÷"].firstIndex(of: calculatingFormula.last!) != nil {
-        calculatingFormula.removeLast()
+      var tempFormula = formula
+      if ["+", "-", "×", "÷"].firstIndex(of: tempFormula.last!) != nil {
+        tempFormula.removeLast()
       }
       
       while true {
-        let indexOf乘號 = calculatingFormula.firstIndex(of: "×")
-        let indexOf除號 = calculatingFormula.firstIndex(of: "÷")
+        let indexOf乘號 = tempFormula.firstIndex(of: "×")
+        let indexOf除號 = tempFormula.firstIndex(of: "÷")
         
         if indexOf乘號 == nil && indexOf除號 == nil {
           break
         }
         if indexOf乘號 != nil && (indexOf除號 == nil || indexOf乘號! < indexOf除號!) {
-          let number1 = Double(calculatingFormula[indexOf乘號! - 1])!
-          let number2 = Double(calculatingFormula[indexOf乘號! + 1])!
-          calculatingFormula[indexOf乘號! - 1] = String(number1 * number2)
-          calculatingFormula.remove(at: indexOf乘號! + 1)
-          calculatingFormula.remove(at: indexOf乘號!)
+          let number1 = Double(tempFormula[indexOf乘號! - 1])!
+          let number2 = Double(tempFormula[indexOf乘號! + 1])!
+          tempFormula[indexOf乘號! - 1] = String(number1 * number2)
+          tempFormula.remove(at: indexOf乘號! + 1)
+          tempFormula.remove(at: indexOf乘號!)
         }
         if indexOf除號 != nil && (indexOf乘號 == nil || indexOf除號! < indexOf乘號!) {
-          let number1 = Double(calculatingFormula[indexOf除號! - 1])!
-          let number2 = Double(calculatingFormula[indexOf除號! + 1])!
-          calculatingFormula[indexOf除號! - 1] = String(number1 / number2)
-          calculatingFormula.remove(at: indexOf除號! + 1)
-          calculatingFormula.remove(at: indexOf除號!)
+          let number1 = Double(tempFormula[indexOf除號! - 1])!
+          let number2 = Double(tempFormula[indexOf除號! + 1])!
+          tempFormula[indexOf除號! - 1] = String(number1 / number2)
+          tempFormula.remove(at: indexOf除號! + 1)
+          tempFormula.remove(at: indexOf除號!)
           
         }
       }
-      while calculatingFormula.count > 1 {
-        let number1 = Double(calculatingFormula[0])!
-        let number2 = Double(calculatingFormula[2])!
-        if calculatingFormula[1] == "+" {
-          calculatingFormula[0] = String(number1 + number2)
+      while tempFormula.count > 1 {
+        let number1 = Double(tempFormula[0])!
+        let number2 = Double(tempFormula[2])!
+        if tempFormula[1] == "+" {
+          tempFormula[0] = String(number1 + number2)
         } else {
-          calculatingFormula[0] = String(number1 - number2)
+          tempFormula[0] = String(number1 - number2)
         }
-        calculatingFormula.remove(at: 2)
-        calculatingFormula.remove(at: 1)
+        tempFormula.remove(at: 2)
+        tempFormula.remove(at: 1)
       }
       
-      if Double(calculatingFormula.last!)!.truncatingRemainder(dividingBy: 1) == 0 {
-        var number = calculatingFormula.popLast()!
+      if Double(tempFormula.last!)!.truncatingRemainder(dividingBy: 1) == 0 {
+        var number = tempFormula.popLast()!
         number.removeLast()
         number.removeLast()
-        calculatingFormula.append(number)
+        tempFormula.append(number)
       }
       
-      print(calculatingFormula)
-      return calculatingFormula.last!
+      return tempFormula.last!
     }
   }