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\r\n#include <iostream>\r\nusing namespace std;\r\n\/\/\u57fa\u7c7b\uff1a\u4e3a\u4e86\u80fd\u591f\u88ab\u88c5\u9970\uff0c\u8fd9\u4e2a\u5fc5\u987b\u662f\u4e2a\u80fd\u591f\u88ab\u7ee7\u627f\u7684\u7c7b\r\nclass B\r\n{\r\npublic:\r\n B(char n): c(n) {}\r\n B(): c('X') {}\r\n ~B() {}\r\n \/\/\u53ef\u4ee5\u88ab\u6269\u5145\u529f\u80fd\u7684\u65b9\u6cd5\uff0c\u9700\u8981\u591a\u6001\u7279\u6027\uff0c\u4ee5\u4fbf\u5b50\u7c7b\u8fdb\u884c\u6269\u5145\r\n \/\/\u76ee\u524d\u7684\u529f\u80fd\u5c31\u662f\u663e\u793a\u4e00\u4e2a\u5b57\u7b26\uff0c\u8fd9\u4e2a\u5b57\u7b26\u662f\u7528\u8fd9\u4e2a\u57fa\u7c7b\u5305\u88f9\u7684\r\n virtual void display() { cout << c ; }\r\nprivate:\r\n char c;\r\n};\r\n\r\n\/\/\u62bd\u8c61\u88c5\u9970\u5668\uff1a\u5f00\u59cb\u8fdb\u884c\u529f\u80fd\u6269\u5145\u7684\u6846\u67b6\uff0c\u7ee7\u627f\u57fa\u7c7b\u5e76\u4e14\u5305\u88f9\u57fa\u7c7b\r\nclass A : public B\r\n{\r\npublic:\r\n A(B &t): b(t) {}\r\n ~A() {}\r\n \/\/\u8986\u76d6\u57fa\u7c7b\u7684\u529f\u80fd\uff0c\u4f46\u662f\uff0c\u5475\u5475\uff0c\u5b9e\u9645\u4e0a\u53ea\u662f\u628a\u63a7\u5236\u4f20\u9012\u5230\u88ab\u5305\u88f9\u7684\u57fa\u7c7b\r\n \/\/\u53ef\u522b\u5fd8\u4e86\uff0c\u8fd9\u65f6\u7684b\u53ef\u662f\u57fa\u7c7b\u5f15\u7528\uff0c\u8fd9\u662f\u6709\u591a\u6001\u673a\u5236\u7684\u8c03\u7528\r\n void display() { b.display(); }\r\nprivate:\r\n B &b;\r\n};\r\n\r\n\/\/\u771f\u6b63\u7684\u88c5\u9970\u529f\u80fd\uff0c\u6269\u5145\u5b9e\u9645\u529f\u80fd\uff0c\u591a\u663e\u793a\u4e00\u4e2a\u5b57\u7b26\uff0c\u5c31\u662f\u90a3\u4e2an,\u5b83\u4f1a\u91cd\u65b0\u5305\u88f9\u8fd9\u4e2a\u5b57\u7b26\r\nclass C : public A\r\n{\r\npublic:\r\n C(B &t, char n): A(t) , c(n) {};\r\n ~C(){}\r\n void display()\r\n {\r\n cout << c;\r\n \/\/\u975e\u5e38\u5173\u952e\u7684\u4e00\u6b65\uff0c\u5c06\u63a7\u5236\u8f6c\u53d1\u7ed9\u4e0a\u4e00\u5c42\u7ee7\u627f\u7684\u540c\u540d\u51fd\u6570\uff0c\r\n \/\/\u56e0\u4e3a\u662f\u76f4\u63a5\u5728\u5185\u90e8\u53d1\u8d77\u8c03\u7528\uff0c\u8fd9\u4e2a\u53ef\u6ca1\u6709\u591a\u6001\r\n A::display();\r\n } \r\nprivate:\r\n char c; \r\n}; \r\n\r\nint main() \r\n{\r\n B *p_obj = new B('A'); \/\/\u539f\u59cb\u4ee3\u7801\uff0c\u4e0d\u4fee\u6539\r\n p_obj = new C(*p_obj, 'B'); \/\/\u589e\u52a0\u7684\u4ee3\u7801\r\n p_obj = new C(*p_obj, 'C'); \/\/\u589e\u52a0\u7684\u4ee3\u7801\r\n \/\/\u539f\u672c\u7684\u7a0b\u5e8f\u529f\u80fd\uff0c\u5c31\u662f\u663e\u793a\u4e00\u4e2aA\u3002\r\n \/\/\u73b0\u5728\u589e\u52a0\u4e86\u4e24\u5c42\u5305\u88f9\uff0c\u5c31\u53ef\u4ee5\u591a\u663e\u793a\u4e24\u4e2a\u5b57\u6bcd\u54af\r\n p_obj->display(); \/\/\u539f\u59cb\u4ee3\u7801\uff0c\u4e0d\u4fee\u6539\r\n cout << endl;\r\n}\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"\u8fd9\u91cc\u8981\u8bf4\u7684\u662f\u8fd9\u4e2a\u53eb\u505a\u201c\u88c5\u9970\u5668\u201d\u7684\u8bbe\u8ba1\u6a21\u5f0f\u7684\u6700\u6700\u7b80\u5355\u7684C++\u5b9e\u73b0\u3002 \u88c5\u9970\u5668\u6a21\u5f0f\u5b9e\u9645 … \u7ee7\u7eed\u9605\u8bfb