From 160f1ebd9f0851db75e587b8076be426bf7e6915 Mon Sep 17 00:00:00 2001
From: Pin Lin <moneycat711@gmail.com>
Date: Wed, 6 May 2020 06:41:05 +0800
Subject: [PATCH] =?UTF-8?q?=E5=AF=A6=E4=BD=9C=E6=8C=89=E4=B8=8B=20.=20?=
 =?UTF-8?q?=E8=A6=81=E6=80=8E=E9=BA=BC=E8=99=95=E7=90=86?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 AndroidCalculator/Calculator.swift | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/AndroidCalculator/Calculator.swift b/AndroidCalculator/Calculator.swift
index 8fa20b4..0da621c 100644
--- a/AndroidCalculator/Calculator.swift
+++ b/AndroidCalculator/Calculator.swift
@@ -47,6 +47,15 @@ class Calculator {
         formula.append(formula.popLast()! + text)
       }
       
+    case ".":
+      if formula.last!.firstIndex(of: ".") != nil {
+        return
+      } else if ["+", "-", "×", "÷"].firstIndex(of: formula.last!) != nil {
+        return
+      } else {
+        formula.append(formula.popLast()! + text)
+      }
+      
     default:
       print(formula)
     }