{"id":112108,"date":"2026-10-02T18:08:51","date_gmt":"2026-10-02T10:08:51","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/112108.html"},"modified":"2026-10-02T18:08:51","modified_gmt":"2026-10-02T10:08:51","slug":"c%e5%ad%a6%e4%b9%a0%e6%97%a5%e8%ae%b0-day10%ef%bc%9a%e5%a4%9a%e6%80%81","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/112108.html","title":{"rendered":"C++\u5b66\u4e60\u65e5\u8bb0 Day10\uff1a\u591a\u6001"},"content":{"rendered":"<p>## \u4eca\u5929\u5b66\u4e86\u4ec0\u4e48<\/p>\n<p>\u4eca\u5929\u5b66\u4e60C&#043;&#043;\u7684\u591a\u6001\u3002<\/p>\n<p>## \u591a\u6001\u7684\u5206\u7c7b<\/p>\n<p>\u9759\u6001\u591a\u6001&#xff1a;\u51fd\u6570\u91cd\u8f7d\u3001\u8fd0\u7b97\u7b26\u91cd\u8f7d\u3001\u6a21\u677f&#xff0c;\u590d\u7528\u51fd\u6570\u540d&#xff1b;<\/p>\n<p>\u52a8\u6001\u591a\u6001&#xff1a;\u6d3e\u751f\u7c7b\u548c\u865a\u51fd\u6570\u5b9e\u73b0\u8fd0\u884c\u65f6\u3002<\/p>\n<p>*\u6ce8&#xff1a;\u9759\u6001\u591a\u6001\u548c\u9759\u6001\u51fd\u6570\/\u9759\u6001\u53d8\u91cf&#xff08;static&#xff09;\u6ca1\u6709\u5173\u7cfb&#xff0c;\u53ea\u662f\u76f8\u5bf9\u4e8e\u52a8\u6001\u591a\u6001\u7684\u53eb\u6cd5\u3002<\/p>\n<p>\u2460\u9759\u6001\u591a\u6001\u548c\u52a8\u6001\u591a\u6001\u7684\u533a\u522b&#xff1a;<\/p>\n<ul>\n<li>\u9759\u6001\u591a\u6001\u7684\u51fd\u6570\u5730\u5740\u65e9\u7ed1\u5b9a&#xff1a;\u7f16\u8bd1\u9636\u6bb5 \u786e\u5b9a\u51fd\u6570\u5730\u5740&#xff1b;<\/li>\n<li>\u52a8\u6001\u591a\u6001\u7684\u51fd\u6570\u5730\u5740\u665a\u7ed1\u5b9a&#xff1a;\u8fd0\u884c\u9636\u6bb5 \u786e\u5b9a\u51fd\u6570\u5730\u5740&#xff1b;<\/li>\n<\/ul>\n<p>\u2461\u52a8\u6001\u591a\u6001\u7684\u6ee1\u8db3\u6761\u4ef6&#xff1a;<\/p>\n<ul>\n<li>\u6709\u7ee7\u627f\u5173\u7cfb&#xff1b;<\/li>\n<li>\u5b50\u7c7b\u8981\u91cd\u5199\u7236\u7c7b\u7684\u865a\u51fd\u6570&#xff1b;<\/li>\n<\/ul>\n<p>\u2462\u52a8\u6001\u51fd\u6570\u7684\u4f7f\u7528&#xff1a;\u7236\u7c7b\u7684\u6307\u9488\u6216\u8005\u5f15\u7528\u8981\u6307\u5411\u5b50\u7c7b\u5bf9\u8c61&#xff1b;<\/p>\n<p>\u2463\u591a\u6001\u7684\u4f18\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u4ee3\u7801\u7ec4\u7ec7\u7ed3\u6784\u6e05\u6670&#xff0c;\u53ef\u8bfb\u6027\u5f3a&#xff1b;<\/li>\n<li>\u5229\u4e8e\u524d\u671f\u548c\u540e\u671f\u7684\u6269\u5c55\u548c\u7ef4\u62a4&#xff1b;<\/li>\n<\/ul>\n<p>## \u7eaf\u865a\u51fd\u6570\u548c\u62bd\u8c61\u7c7b<\/p>\n<p>\u7eaf\u865a\u51fd\u6570&#xff1a;\u5728\u591a\u6001\u4e2d&#xff0c;\u901a\u5e38\u7236\u7c7b\u865a\u51fd\u6570\u7528\u5904\u4e0d\u5927&#xff0c;\u4e3b\u8981\u90fd\u662f\u5b50\u7c7b\u8c03\u7528\u91cd\u5199&#xff0c;\u7531\u6b64\u53ef\u4ee5\u6539\u4e3a\u7eaf\u865a\u51fd\u6570\u3002<\/p>\n<p>\u8bed\u6cd5&#xff1a;virtual \u8fd4\u56de\u503c\u7c7b\u578b \u51fd\u6570\u540d&#xff08;\u53c2\u6570\u5217\u8868&#xff09;&#061;0&#xff1b;<\/p>\n<p>\u62bd\u8c61\u7c7b&#xff1a;\u5f53\u7c7b\u4e2d\u6709\u7eaf\u865a\u51fd\u6570&#xff0c;\u8fd9\u4e2a\u7c7b\u4e5f\u79f0\u4e3a\u62bd\u8c61\u7c7b\u3002<\/p>\n<p>\u62bd\u8c61\u7c7b\u7684\u7279\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u2460\u65e0\u6cd5\u5b9e\u4f8b\u5316\u5bf9\u8c61&#xff1b;<\/li>\n<li>\u2461\u5b50\u7c7b\u5fc5\u987b\u91cd\u5199\u62bd\u8c61\u7c7b\u4e2d\u7684\u7eaf\u865a\u51fd\u6570&#xff0c;\u5426\u5219\u4e5f\u5c5e\u4e8e\u62bd\u8c61\u7c7b\u3002<\/li>\n<\/ul>\n<p>## \u865a\u6790\u6784\u548c\u7eaf\u865a\u6790\u6784<\/p>\n<p>\u865a\u6790\u6784\u8bed\u6cd5&#xff1a;<\/p>\n<p>virtual ~ \u7c7b\u540d&#xff08;&#xff09;{}<\/p>\n<p>\u7eaf\u865a\u6790\u6784\u8bed\u6cd5&#xff1a;<\/p>\n<p>class Base{<\/p>\n<p>\u2026<\/p>\n<p>virtual ~ \u7c7b\u540d&#xff08;&#xff09;{}&#061;0&#xff1b;<\/p>\n<p>}<\/p>\n<p>\u2026<\/p>\n<p>\u7c7b\u540d::~\u7c7b\u540d&#xff08;&#xff09;{\u00a0\u2026}<\/p>\n<p>\u95ee\u9898&#xff1a;\u5728\u591a\u6001\u4f7f\u7528\u65f6&#xff0c;\u5b50\u7c7b\u4e2d\u6709\u5c5e\u6027\u5f00\u8f9f\u5230\u5806\u533a&#xff0c;\u7236\u7c7b\u6307\u9488\u5728\u91ca\u653e\u65f6\u65e0\u6cd5\u8c03\u7528\u5b50\u7c7b\u7684\u6790\u6784\u51fd\u6570&#xff0c;\u9020\u6210\u5185\u5b58\u6cc4\u6f0f&#xff1b;<\/p>\n<p>\u89e3\u51b3\u65b9\u6cd5&#xff1a;\u5c06\u7236\u7c7b\u7684\u6790\u6784\u6539\u4e3a\u865a\u6790\u6784\/\u7eaf\u865a\u6790\u6784;<\/p>\n<p>\u9a8c\u8bc1&#xff1a;<\/p>\n<p>class Animal {<br \/>\npublic:<br \/>\nAnimal()<br \/>\n{<br \/>\ncout &lt;&lt; &#034;Animal \u6784\u9020\u51fd\u6570&#034; &lt;&lt; endl;<\/p>\n<p>}<br \/>\nvirtual void speak() &#061; 0;<\/p>\n<p> ~Animal()<br \/>\n{<br \/>\ncout &lt;&lt; &#034;Animal \u865a\u6790\u6784\u51fd\u6570&#034; &lt;&lt; endl;<\/p>\n<p>}<br \/>\n};<\/p>\n<p>class Cat:public Animal {<br \/>\npublic:<\/p>\n<p>Cat(string name)<br \/>\n{<br \/>\ncout &lt;&lt; &#034;Cat \u6784\u9020\u51fd\u6570&#034; &lt;&lt; endl;<br \/>\nm_name &#061;new string(name);<br \/>\n}<\/p>\n<p>virtual void speak()<br \/>\n{<br \/>\ncout &lt;&lt;* m_name&lt;&lt;&#034;\u5c0f\u732b\u5728\u8bf4\u8bdd&#034; &lt;&lt; endl;<br \/>\n}<br \/>\n~Cat()<br \/>\n{<br \/>\nif (m_name!&#061;NULL)<br \/>\n{<br \/>\ncout &lt;&lt; &#034;Cat \u6790\u6784\u51fd\u6570&#034; &lt;&lt; endl;<br \/>\ndelete m_name;<br \/>\nm_name &#061; NULL;<br \/>\n}<br \/>\n}<\/p>\n<p>string* m_name;<br \/>\n};<\/p>\n<p>void test()<br \/>\n{<br \/>\nAnimal* an &#061; new Cat(&#034;Tom&#034;);<br \/>\nan-&gt;speak();<br \/>\ndelete an;<br \/>\n}<\/p>\n<p>\u8fd0\u884c\u53d1\u73b0&#xff0c;\u6253\u5370\u7ed3\u679c\u6ca1\u6709cat\u7684\u6790\u6784\u51fd\u6570&#xff0c;\u5728speak&#xff08;&#xff09;\u5904\u4e0b\u65ad\u70b9&#xff0c;\u8fdb\u5165\u8c03\u8bd5&#xff0c;\u53d1\u73b0\u5728\u6267\u884c\u5b8cspeak\u51fd\u6570\u4ee5\u540e&#xff0c;\u76f4\u63a5\u8fdb\u5165\u4e86Animal\u7684\u6790\u6784\u51fd\u6570&#xff0c;\u5e76\u6ca1\u6709\u8fdb\u5165Cat\u7684\u6790\u6784\u51fd\u6570&#xff0c;\u6240\u4ee5\u5bfc\u81f4cat\u7c7b\u7684m_name\u6307\u9488\u65e0\u6cd5\u91ca\u653e\u3002\u5c06\u7236\u7c7b\u7684\u6790\u6784\u6539\u4e3a\u865a\u6790\u6784&#xff0c;\u91cd\u590d\u8c03\u8bd5\u6b65\u9aa4&#xff0c;\u53d1\u73b0\u8fd9\u4e00\u6b21\u8fdb\u5165\u4e86cat\u7684\u6790\u6784\u51fd\u6570&#xff0c;\u9a8c\u8bc1\u6210\u529f\u3002<\/p>\n<p>\u865a\u6790\u6784\u548c\u7eaf\u865a\u6790\u6784\u7684\u5171\u6027&#xff1a;<\/p>\n<ul>\n<li>\u53ef\u4ee5\u89e3\u51b3\u7236\u7c7b\u6307\u9488\u91ca\u653e\u5b50\u7c7b\u5bf9\u8c61&#xff1b;<\/li>\n<li>\u90fd\u9700\u8981\u6709\u5177\u4f53\u7684\u51fd\u6570\u5b9e\u73b0&#xff1b;<\/li>\n<\/ul>\n<p>\u533a\u522b&#xff1a;\u7eaf\u865a\u6790\u6784\u7684\u7c7b\u5c5e\u4e8e\u62bd\u8c61\u7c7b&#xff0c;\u65e0\u6cd5\u5b9e\u4f8b\u5316\u5bf9\u8c61\u3002<\/p>\n<p>*\u6ce8&#xff1a;\u5982\u679c\u5b50\u7c7b\u4e2d\u6ca1\u6709\u5806\u533a\u6570\u636e\u53ef\u4ee5\u4e0d\u5199\u865a\u6790\u6784\/\u7eaf\u865a\u6790\u6784\u3002<\/p>\n<p>## \u7ec3\u4e60<\/p>\n<p>1.\u5229\u7528\u591a\u6001\u5b9e\u73b0\u8ba1\u7b97\u5668&#xff1a;<\/p>\n<p>#include&lt;iostream&gt;<br \/>\nusing namespace std;<\/p>\n<p>class calculator {<br \/>\npublic:<br \/>\nvirtual int getResult()<br \/>\n{<br \/>\nreturn 0;<br \/>\n}<\/p>\n<p>int num1;<br \/>\nint num2;<br \/>\n};<\/p>\n<p>class Addcalculator:public calculator {<br \/>\npublic:<br \/>\nint getResult()<br \/>\n{<br \/>\nreturn num1 &#043; num2;<br \/>\n}<br \/>\n};<\/p>\n<p>class Subcalculator :public calculator {<br \/>\npublic:<br \/>\nint getResult()<br \/>\n{<br \/>\nreturn num1 &#8211; num2;<br \/>\n}<br \/>\n};<\/p>\n<p>class Mulcalculator :public calculator {<br \/>\npublic:<br \/>\nint getResult()<br \/>\n{<br \/>\nreturn num1 * num2;<br \/>\n}<br \/>\n};<\/p>\n<p>void test()<br \/>\n{<br \/>\ncalculator* cal &#061; new Addcalculator;<br \/>\ncal-&gt;num1 &#061; 10;<br \/>\ncal-&gt;num2 &#061; 10;<br \/>\ncal-&gt;getResult();<br \/>\ncout &lt;&lt; cal-&gt;num1 &lt;&lt; &#034; &#043; &#034; &lt;&lt; cal-&gt;num2 &lt;&lt; &#034; &#061; &#034; &lt;&lt; cal-&gt;getResult() &lt;&lt; endl;<br \/>\ndelete cal;<\/p>\n<p> cal &#061; new Subcalculator;<br \/>\ncal-&gt;num1 &#061; 10;<br \/>\ncal-&gt;num2 &#061; 10;<br \/>\ncout &lt;&lt; cal-&gt;num1 &lt;&lt; &#034; &#8211; &#034; &lt;&lt; cal-&gt;num2 &lt;&lt; &#034; &#061; &#034; &lt;&lt; cal-&gt;getResult() &lt;&lt; endl;<br \/>\ndelete cal;<\/p>\n<p> cal &#061; new Mulcalculator;<br \/>\ncal-&gt;num1 &#061; 10;<br \/>\ncal-&gt;num2 &#061; 10;<br \/>\ncout &lt;&lt; cal-&gt;num1 &lt;&lt; &#034; * &#034; &lt;&lt; cal-&gt;num2 &lt;&lt; &#034; &#061; &#034; &lt;&lt; cal-&gt;getResult() &lt;&lt; endl;<br \/>\ndelete cal;<br \/>\n}<\/p>\n<p>int main()<br \/>\n{<br \/>\ntest();<br \/>\nreturn 0;<br \/>\n}<\/p>\n<p>## \u8865\u5145<\/p>\n<p>\u865a\u51fd\u6570\u8c03\u7528\u94fe&#xff1a;<\/p>\n<p>Animal *p&#061;new Dog();<\/p>\n<p>p-&gt;speak();<\/p>\n<p>\u987a\u5e8f&#xff1a;<\/p>\n<p>1.p\u662f\u7236\u7c7b\u6307\u9488&#xff0c;\u6307\u5411Dog\u7c7b\u7684\u5bf9\u8c61&#xff1b;<\/p>\n<p>2.Dog\u5bf9\u8c61\u5185\u90e8\u6709_vfptr&#xff08;virtual function pointer&#xff0c;\u865a\u51fd\u6570\u6307\u9488&#xff09;&#xff1b;<\/p>\n<p>3._vfptr\u6307\u5411Dog\u7c7b\u7684\u865a\u51fd\u6570\u8868&#xff1b;<\/p>\n<p>4.\u865a\u51fd\u6570\u8868\u4e2d[0]\u662fDog::speak&#xff1b;<\/p>\n<p>5.\u6700\u7ec8\u6267\u884cDog::speak\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>## \u4eca\u5929\u5b66\u4e86\u4ec0\u4e48\u4eca\u5929\u5b66\u4e60C\u7684\u591a\u6001\u3002## \u591a\u6001\u7684\u5206\u7c7b\u9759\u6001\u591a\u6001&#xff1a;\u51fd\u6570\u91cd\u8f7d\u3001\u8fd0\u7b97\u7b26\u91cd\u8f7d\u3001\u6a21\u677f&#xff0c;\u590d\u7528\u51fd\u6570\u540d&#xff1b;\u52a8\u6001\u591a\u6001&#xff1a;\u6d3e\u751f\u7c7b\u548c\u865a\u51fd\u6570\u5b9e\u73b0\u8fd0\u884c\u65f6\u3002*\u6ce8&#xff1a;\u9759\u6001\u591a\u6001\u548c\u9759\u6001\u51fd\u6570\/\u9759\u6001\u53d8\u91cf&#xff08;static&#xff09;\u6ca1\u6709\u5173\u7cfb&#xff0c;\u53ea\u662f\u76f8\u5bf9\u4e8e\u52a8\u6001\u591a\u6001\u7684\u53eb\u6cd5\u3002\u2460\u9759\u6001\u591a\u6001\u548c\u52a8\u6001\u591a\u6001\u7684\u533a\u522b&#xff1a;\u9759\u6001\u591a\u6001\u7684\u51fd\u6570\u5730\u5740\u65e9\u7ed1\u5b9a&#xff1a;\u7f16\u8bd1\u9636\u6bb5 \u786e\u5b9a\u51fd\u6570\u5730\u5740&#xff1b;\u52a8\u6001\u591a\u6001\u7684\u51fd\u6570\u5730\u5740\u665a\u7ed1\u5b9a<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[55,371,190],"topic":[],"class_list":["post-112108","post","type-post","status-publish","format-standard","hentry","category-server","tag-c","tag-371","tag-190"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C++\u5b66\u4e60\u65e5\u8bb0 Day10\uff1a\u591a\u6001 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/112108.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta 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