From baf036d9b52dd582665c1d996ed331946407a804 Mon Sep 17 00:00:00 2001
From: huihut <huihut@outlook.com>
Date: Wed, 2 May 2018 11:35:32 +0800
Subject: [PATCH] =?UTF-8?q?=E4=B8=BA=E5=8A=A8=E6=80=81=E5=A4=9A=E6=80=81?=
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---
 README.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/README.md b/README.md
index 6a388f6..961a89a 100644
--- a/README.md
+++ b/README.md
@@ -515,6 +515,7 @@ public:
     {
         ...
     }
+    virtual ~Shape();
 };
 class Circle : public Shape     // 圆形类
 {
@@ -534,6 +535,10 @@ int main()
     Shape * shape2 = new Rect(5.0, 6.0);
     shape1->calcArea();         // 调用圆形类里面的方法
     shape2->calcArea();         // 调用矩形类里面的方法
+    delete shape1;
+    shape1 = nullptr;
+    delete shape2;
+    shape2 = nullptr;
     return 0;
 }
 ```