From 4bbf187cd28f860917ab1c6227b32fdebec37d3d Mon Sep 17 00:00:00 2001
From: Pin Lin <moneycat711@gmail.com>
Date: Wed, 6 May 2020 06:33:39 +0800
Subject: [PATCH] =?UTF-8?q?=E5=AF=A6=E4=BD=9C=E6=8C=89=E4=B8=8B=200=20?=
 =?UTF-8?q?=E4=BB=A5=E5=A4=96=E7=9A=84=E6=95=B8=E5=AD=97=E8=A6=81=E6=80=8E?=
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---
 AndroidCalculator/Calculator.swift | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/AndroidCalculator/Calculator.swift b/AndroidCalculator/Calculator.swift
index a9c6f6b..8fa20b4 100644
--- a/AndroidCalculator/Calculator.swift
+++ b/AndroidCalculator/Calculator.swift
@@ -37,8 +37,18 @@ class Calculator {
         formula.append(formula.popLast()! + text)
       }
       
+    case "1", "2", "3", "4", "5", "6", "7", "8", "9":
+      if formula.last == "0" {
+        formula.removeLast()
+        formula.append(text)
+      } else if ["+", "-", "×", "÷"].firstIndex(of: formula.last!) != nil {
+        formula.append(text)
+      } else {
+        formula.append(formula.popLast()! + text)
+      }
+      
     default:
-      formula.append(text)
+      print(formula)
     }
   }
 }