{"id":166,"date":"2023-06-13T21:01:38","date_gmt":"2023-06-13T13:01:38","guid":{"rendered":"https:\/\/www.gzlcy.cn\/?p=166"},"modified":"2023-06-13T21:01:38","modified_gmt":"2023-06-13T13:01:38","slug":"%e5%87%bd%e6%95%b0%e6%8c%87%e9%92%88%e7%9a%84%e5%85%ad%e4%b8%aa%e9%ab%98%e7%ba%a7%e5%ba%94%e7%94%a8%e5%9c%ba%e6%99%af","status":"publish","type":"post","link":"https:\/\/www.gzlcy.cn\/?p=166","title":{"rendered":"\u51fd\u6570\u6307\u9488\u7684\u516d\u4e2a\u9ad8\u7ea7\u5e94\u7528\u573a\u666f"},"content":{"rendered":"

\u70b9<\/span><\/span><\/span>\u51fb\u4e0a\u65b9\u201c<\/span>C\u8bed\u8a00\u4e0eCPP\u7f16\u7a0b<\/strong><\/span><\/span>\u201d\uff0c\u9009\u62e9\u201c<\/span><\/span>\u5173\u6ce8\/<\/span><\/strong><\/span>\u7f6e\u9876\/\u661f\u6807\u516c\u4f17\u53f7<\/span><\/strong>\u201d<\/span><\/span>
<\/p>
\u5e72\u8d27\u798f\u5229\uff0c\u7b2c\u4e00\u65f6\u95f4\u9001\u8fbe\uff01<\/span>
<\/p>
c \u51fd\u6570\u8fd4\u56de\u6570\u7ec4_\u51fd\u6570\u8fd4\u56de\u503c\u80fd\u662f\u6570\u7ec4\u5417_\u51fd\u6570\u8fd4\u56de\u5b57\u7b26\u6570\u7ec4<\/span><\/p><\/pre>\n<\/p>\n
\u6700\u8fd1\u6709\u5c0f\u4f19\u4f34\u8bf4\u6ca1\u6709\u6536\u5230\u5f53\u5929\u7684\u6587\u7ae0\u63a8\u9001\uff0c\u8fd9\u662f\u56e0\u4e3a\u5fae\u4fe1\u6539\u4e86\u63a8\u9001\u673a\u5236\uff0c\u786e\u5b9e\u4f1a\u4e00\u90e8\u5206\u6709\u5c0f\u4f19\u4f34\u5237\u4e0d\u5230\u5f53\u5929\u7684\u6587\u7ae0\uff0c\u4e00\u4e9b\u6bd4\u8f83\u5b9e\u7528\u7684\u77e5\u8bc6\u548c\u4fe1\u606f\uff0c\u9519\u8fc7\u4e86\u5c31\u662f\u9519\u8fc7\u4e86\u3002\u6240\u4ee5\u5efa\u8bae\u5927\u5bb6\u52a0\u4e2a\u661f\u6807\u2b50\ufe0f\uff0c\u5c31\u80fd\u7b2c\u4e00\u65f6\u95f4\u6536\u5230\u63a8\u9001\u4e86\u3002<\/p>\n
\u51fd\u6570\u8fd4\u56de\u503c\u80fd\u662f\u6570\u7ec4\u5417_c \u51fd\u6570\u8fd4\u56de\u6570\u7ec4_\u51fd\u6570\u8fd4\u56de\u5b57\u7b26\u6570\u7ec4<\/p>\n
\u5c0f\u4f19\u4f34\u4eec\u5927\u5bb6\u597d\uff0c\u6211\u662f\u98de\u5b87\u3002<\/p>\n
\u51fd\u6570\u6307\u9488\u662f\u4e00\u79cd\u975e\u5e38\u5f3a\u5927\u7684\u7f16\u7a0b\u5de5\u5177\uff0c\u5b83\u53ef\u4ee5\u8ba9\u6211\u4eec\u4ee5\u66f4\u52a0\u7075\u6d3b\u7684\u65b9\u5f0f\u7f16\u5199\u7a0b\u5e8f\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u5c06\u4ecb\u7ecd 6 \u4e2a\u51fd\u6570\u6307\u9488\u7684\u9ad8\u7ea7\u5e94\u7528\u573a\u666f\uff0c\u5e76\u8d34\u51fa\u76f8\u5e94\u7684\u4ee3\u7801\u6848\u4f8b\u548c\u89e3\u91ca\u3002<\/p>\n
\u56de\u8c03\u51fd\u6570\u662f\u6307\u5728\u67d0\u4e2a\u4e8b\u4ef6\u53d1\u751f\u65f6\u88ab\u8c03\u7528\u7684\u51fd\u6570\u3002\u901a\u5e38\uff0c\u56de\u8c03\u51fd\u6570\u662f\u5728\u67d0\u4e2a\u5e93\u51fd\u6570\u6216\u6846\u67b6\u51fd\u6570\u4e2d\u6ce8\u518c\u7684\uff0c\u5f53\u67d0\u4e2a\u6761\u4ef6\u6ee1\u8db3\u65f6\uff0c\u5e93\u51fd\u6570\u6216\u6846\u67b6\u51fd\u6570\u4f1a\u8c03\u7528\u56de\u8c03\u51fd\u6570\u6765\u6267\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n
#include<\/span> <\/span><\/span><\/span><\/code>
<\/span><\/code>void<\/span> handle_event<\/span>(int<\/span> event_type, void<\/span> (*callback)(void<\/span>))<\/span><\/span><\/span><\/code>{<\/span><\/code>    printf<\/span>(\"event %d occurredn\"<\/span>, event_type);<\/span><\/code>    if<\/span> (callback)<\/span><\/code>    {<\/span><\/code>        callback();<\/span><\/code>    }<\/span><\/code>}<\/span><\/code>
<\/span><\/code>void<\/span> callback_function<\/span>()<\/span><\/span><\/span><\/code>{<\/span><\/code>    printf<\/span>(\"callback function calledn\"<\/span>);<\/span><\/code>}<\/span><\/code>
<\/span><\/code>int<\/span> main<\/span>()<\/span><\/span><\/span><\/code>{<\/span><\/code>    handle_event(1<\/span>, callback_function);<\/span><\/code>    handle_event(2<\/span>, NULL<\/span>);<\/span><\/code>    return<\/span> 0<\/span>;<\/span><\/code>}<\/span><\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a handle_event \u51fd\u6570\uff0c\u5b83\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff1a\u4e00\u4e2a\u4e8b\u4ef6\u7c7b\u578b\u548c\u4e00\u4e2a\u51fd\u6570\u6307\u9488\u3002\u5982\u679c\u51fd\u6570\u6307\u9488\u4e0d\u4e3a\u7a7a\uff0c\u5219\u4f1a\u8c03\u7528\u6307\u5b9a\u7684\u51fd\u6570\u3002<\/p>\n
\u5728 main \u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u5206\u522b\u8c03\u7528 handle_event \u51fd\u6570\u6765\u89e6\u53d1\u4e24\u4e2a\u4e8b\u4ef6\uff0c\u5176\u4e2d\u7b2c\u4e00\u4e2a\u4e8b\u4ef6\u6ce8\u518c\u4e86\u4e00\u4e2a\u56de\u8c03\u51fd\u6570 callback_function\uff0c\u7b2c\u4e8c\u4e2a\u4e8b\u4ef6\u6ca1\u6709\u6ce8\u518c\u56de\u8c03\u51fd\u6570\u3002<\/p>\n
\u51fd\u6570\u53c2\u6570\u5316\u662f\u6307\u901a\u8fc7\u51fd\u6570\u6307\u9488\u5c06\u51fd\u6570\u7684\u67d0\u4e9b\u884c\u4e3a\u53c2\u6570\u5316\u3002\u8fd9\u6837\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u8c03\u7528\u51fd\u6570\u65f6\u52a8\u6001\u5730\u6307\u5b9a\u51fd\u6570\u7684\u884c\u4e3a\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n
#include<\/span> <\/span><\/span><\/span><\/code>
<\/span><\/code>void<\/span> process_array<\/span>(int<\/span> *array<\/span>, size_t<\/span> size, int<\/span> (*process)(int<\/span>))<\/span><\/span><\/span><\/code>{<\/span><\/code>    for<\/span> (size_t<\/span> i = 0<\/span>; i < size; i++)<\/span><\/code>    {<\/span><\/code>        array<\/span>[i] = process(array<\/span>[i]);<\/span><\/code>    }<\/span><\/code>}<\/span><\/code>
<\/span><\/code>int<\/span> increment<\/span>(int<\/span> n)<\/span><\/span><\/span><\/code>{<\/span><\/code>    return<\/span> n + 1<\/span>;<\/span><\/code>}<\/span><\/code>
<\/span><\/code>int<\/span> main<\/span>()<\/span><\/span><\/span><\/code>{<\/span><\/code>    int<\/span> array<\/span>[] = {1<\/span>, 2<\/span>, 3<\/span>, 4<\/span>, 5<\/span>};<\/span><\/code>    size_t<\/span> size = sizeof<\/span>(array<\/span>) \/ sizeof<\/span>(int<\/span>);<\/span><\/code>    process_array(array<\/span>, size, increment);<\/span><\/code>    for<\/span> (size_t<\/span> i = 0<\/span>; i < size; i++)<\/span><\/code>    {<\/span><\/code>        printf<\/span>(\"%d \"<\/span>, array<\/span>[i]);<\/span><\/code>    }<\/span><\/code>    printf<\/span>(\"n\"<\/span>);<\/span><\/code>    return<\/span> 0<\/span>;<\/span><\/code>}<\/span><\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a process_array \u51fd\u6570\uff0c\u5b83\u63a5\u53d7\u4e09\u4e2a\u53c2\u6570\uff1a\u4e00\u4e2a\u6574\u578b\u6570\u7ec4\u3001\u6570\u7ec4\u5927\u5c0f\u548c\u4e00\u4e2a\u51fd\u6570\u6307\u9488\u3002\u51fd\u6570\u6307\u9488\u6307\u5411\u4e00\u4e2a\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u63a5\u53d7\u4e00\u4e2a\u6574\u578b\u53c2\u6570\u5e76\u8fd4\u56de\u4e00\u4e2a\u6574\u578b\u7ed3\u679c\u3002<\/p>\n
\u5728 process_array \u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u5c06\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u4f20\u9012\u7ed9\u6307\u5b9a\u7684\u51fd\u6570\uff0c\u7136\u540e\u5c06\u51fd\u6570\u7684\u8fd4\u56de\u503c\u5b58\u50a8\u56de\u539f\u6570\u7ec4\u4e2d\u3002<\/p>\n
\u5728 main \u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a increment \u51fd\u6570\uff0c\u5b83\u5c06\u4f20\u5165\u7684\u6574\u6570\u52a0 1\u3002\u7136\u540e\uff0c\u6211\u4eec\u8c03\u7528 process_array \u51fd\u6570\u6765\u5904\u7406\u6574\u578b\u6570\u7ec4\uff0c\u5e76\u6253\u5370\u51fa\u7ed3\u679c\u3002<\/p>\n
\u6392\u5e8f\u7b97\u6cd5\u662f\u51fd\u6570\u6307\u9488\u7684\u53e6\u4e00\u4e2a\u5e38\u89c1\u5e94\u7528\u573a\u666f\u3002\u901a\u8fc7\u4f20\u9012\u4e0d\u540c\u7684\u6bd4\u8f83\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u4e0d\u540c\u7684\u6392\u5e8f\u7b97\u6cd5\u4e2d\u91cd\u7528\u76f8\u540c\u7684\u4ee3\u7801\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n
#include<\/span> <\/span><\/span><\/span><\/code>#include<\/span> <\/span><\/span><\/span><\/code>
<\/span><\/code>typedef<\/span> int<\/span> (*compare_func_t<\/span>)<\/span>(const<\/span> void<\/span> *, const<\/span> void<\/span> *)<\/span><\/span>;<\/span><\/code>
<\/span><\/code>void<\/span> sort<\/span>(int<\/span> *array<\/span>, size_t<\/span> size, compare_func_t<\/span> compare_func)<\/span><\/span><\/span><\/code>{<\/span><\/code>    qsort(array<\/span>, size, sizeof<\/span>(int<\/span>), compare_func);<\/span><\/code>}<\/span><\/code>
<\/span><\/code>int<\/span> compare_int<\/span>(const<\/span> void<\/span> *a, const<\/span> void<\/span> *b)<\/span><\/span><\/span><\/code>{<\/span><\/code>    return<\/span> (*(int<\/span>*)a - *(int<\/span>*)b);<\/span><\/code>}<\/span><\/code>
<\/span><\/code>int<\/span> compare_reverse_int<\/span>(const<\/span> void<\/span> *a, const<\/span> void<\/span> *b)<\/span><\/span><\/span><\/code>{<\/span><\/code>    return<\/span> (*(int<\/span>*)b - *(int<\/span>*)a);<\/span><\/code>}<\/span><\/code>
<\/span><\/code>int<\/span> main<\/span>()<\/span><\/span><\/span><\/code>{<\/span><\/code>    int<\/span> array<\/span>[] = {3<\/span>, 1<\/span>, 4<\/span>, 1<\/span>, 5<\/span>, 9<\/span>, 2<\/span>, 6<\/span>, 5<\/span>, 3<\/span>, 5<\/span>};<\/span><\/code>    size_t<\/span> size = sizeof<\/span>(array<\/span>) \/ sizeof<\/span>(int<\/span>);<\/span><\/code>    sort(array<\/span>, size, compare_int);<\/span><\/code>    for<\/span> (size_t<\/span> i = 0<\/span>; i < size; i++)<\/span><\/code>    {<\/span><\/code>        printf<\/span>(\"%d \"<\/span>, array<\/span>[i]);<\/span><\/code>    }<\/span><\/code>    printf<\/span>(\"n\"<\/span>);<\/span><\/code>    sort(array<\/span>, size, compare_reverse_int);<\/span><\/code>    for<\/span> (size_t<\/span> i = 0<\/span>; i < size; i++)<\/span><\/code>    {<\/span><\/code>        printf<\/span>(\"%d \"<\/span>, array<\/span>[i]);<\/span><\/code>    }<\/span><\/code>    printf<\/span>(\"n\"<\/span>);<\/span><\/code>    return<\/span> 0<\/span>;<\/span><\/code>}<\/span><\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a sort \u51fd\u6570\uff0c\u5b83\u63a5\u53d7\u4e09\u4e2a\u53c2\u6570\uff1a\u4e00\u4e2a\u6574\u578b\u6570\u7ec4\u3001\u6570\u7ec4\u5927\u5c0f\u548c\u4e00\u4e2a\u6bd4\u8f83\u51fd\u6570\u6307\u9488\u3002<\/p>\n
\u6bd4\u8f83\u51fd\u6570\u6307\u9488\u6307\u5411\u4e00\u4e2a\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u63a5\u53d7\u4e24\u4e2a\u6307\u5411\u5e38\u91cf void \u7c7b\u578b\u7684\u6307\u9488\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u6574\u578b\u7ed3\u679c\u3002<\/p>\n
\u5728 sort \u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u6807\u51c6\u5e93\u51fd\u6570 qsort \u6765\u5bf9\u6574\u578b\u6570\u7ec4\u8fdb\u884c\u6392\u5e8f\uff0c\u5176\u4e2d\u6bd4\u8f83\u51fd\u6570\u6307\u9488\u7531\u8c03\u7528\u8005\u4f20\u9012\u3002<\/p>\n
\u5728 main \u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e24\u4e2a\u6bd4\u8f83\u51fd\u6570 compare_int \u548c compare_reverse_int\uff0c\u5206\u522b\u7528\u4e8e\u5347\u5e8f\u548c\u964d\u5e8f\u6392\u5e8f\u3002\u7136\u540e\uff0c\u6211\u4eec\u8c03\u7528 sort \u51fd\u6570\u6765\u5bf9\u6574\u578b\u6570\u7ec4\u8fdb\u884c\u6392\u5e8f\uff0c\u5e76\u6253\u5370\u51fa\u7ed3\u679c\u3002<\/p>\n
\u51fd\u6570\u6307\u9488\u6570\u7ec4\u662f\u6307\u4e00\u4e2a\u6570\u7ec4\uff0c\u5176\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u90fd\u662f\u4e00\u4e2a\u51fd\u6570\u6307\u9488\u3002\u8fd9\u79cd\u6570\u7ec4\u53ef\u4ee5\u7528\u4e8e\u5b9e\u73b0\u4e00\u4e2a\u5206\u6d3e\u8868\uff0c\u6839\u636e\u8f93\u5165\u53c2\u6570\u7684\u4e0d\u540c\uff0c\u52a8\u6001\u5730\u8c03\u7528\u4e0d\u540c\u7684\u51fd\u6570\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n
#include<\/span> <\/span><\/span><\/span><\/code>
<\/span><\/code>void<\/span> add<\/span>(int<\/span> a, int<\/span> b)<\/span><\/span><\/span><\/code>{<\/span><\/code>    printf<\/span>(\"%d + %d = %dn\"<\/span>, a, b, a + b);<\/span><\/code>}<\/span><\/code>
<\/span><\/code>void<\/span> subtract<\/span>(int<\/span> a, int<\/span> b)<\/span><\/span><\/span><\/code>{<\/span><\/code>    printf<\/span>(\"%d - %d = %dn\"<\/span>, a, b, a - b);<\/span><\/code>}<\/span><\/code>
<\/span><\/code>void<\/span> multiply<\/span>(int<\/span> a, int<\/span> b)<\/span><\/span><\/span><\/code>{<\/span><\/code>    printf<\/span>(\"%d * %d = %dn\"<\/span>, a, b, a * b);<\/span><\/code>}<\/span><\/code>
<\/span><\/code>void<\/span> divide<\/span>(int<\/span> a, int<\/span> b)<\/span><\/span><\/span><\/code>{<\/span><\/code>    if<\/span> (b == 0<\/span>)<\/span><\/code>    {<\/span><\/code>        printf<\/span>(\"cannot divide by zeron\"<\/span>);<\/span><\/code>    }<\/span><\/code>    else<\/span><\/span><\/code>    {<\/span><\/code>        printf<\/span>(\"%d \/ %d = %dn\"<\/span>, a, b, a \/ b);<\/span><\/code>    }<\/span><\/code>}<\/span><\/code>
<\/span><\/code>typedef<\/span> void<\/span> (*operation_func_t<\/span>)<\/span>(int<\/span>, int<\/span>)<\/span><\/span>;<\/span><\/code>
<\/span><\/code>int<\/span> main<\/span>()<\/span><\/span><\/span><\/code>{<\/span><\/code>    operation_func_t<\/span> operations[] = {add, subtract, multiply, divide};<\/span><\/code>    size_t<\/span> num_operations = sizeof<\/span>(operations) \/ sizeof<\/span>(operation_func_t<\/span>);<\/span><\/code>    int<\/span> a = 10<\/span>, b = 5<\/span>;<\/span><\/code>    for<\/span> (size_t<\/span> i = 0<\/span>; i < num_operations;i++)<\/span><\/code>    {<\/span><\/code>      operations[i](a,b);<\/span><\/code>    }<\/span><\/code>    return<\/span> 0<\/span>;<\/span><\/code>}<\/span><\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u56db\u4e2a\u51fd\u6570 add\u3001subtract\u3001multiply \u548c divide\uff0c\u5206\u522b\u5bf9\u4e24\u4e2a\u6574\u6570\u8fdb\u884c\u52a0\u3001\u51cf\u3001\u4e58\u548c\u9664\u64cd\u4f5c\u3002<\/p>\n
\u7136\u540e\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u51fd\u6570\u6307\u9488\u7c7b\u578b operation_func_t\uff0c\u5b83\u6307\u5411\u4e00\u4e2a\u63a5\u53d7\u4e24\u4e2a\u6574\u578b\u53c2\u6570\u5e76\u6ca1\u6709\u8fd4\u56de\u503c\u7684\u51fd\u6570\u3002<\/p>\n
\u63a5\u7740\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u51fd\u6570\u6307\u9488\u6570\u7ec4 operations\uff0c\u5176\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u90fd\u662f\u4e00\u4e2a operation_func_t \u7c7b\u578b\u7684\u51fd\u6570\u6307\u9488\uff0c\u5206\u522b\u6307\u5411 add\u3001subtract\u3001multiply \u548c divide \u51fd\u6570\u3002<\/p>\n
\u5728 main \u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528 for \u5faa\u73af\u904d\u5386 operations \u6570\u7ec4\uff0c\u5e76\u4f9d\u6b21\u8c03\u7528\u6bcf\u4e2a\u51fd\u6570\u6307\u9488\u6240\u6307\u5411\u7684\u51fd\u6570\u3002\u5728\u6bcf\u6b21\u8c03\u7528\u51fd\u6570\u4e4b\u524d\uff0c\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u9700\u8981\u8bbe\u7f6e a \u548c b \u7684\u503c\u3002\u8fd9\u6837\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u52a8\u6001\u5730\u9009\u62e9\u8981\u6267\u884c\u7684\u64cd\u4f5c\u3002<\/p>\n
\u56de\u6eaf\u6cd5\u662f\u4e00\u79cd\u6c42\u89e3\u4e00\u4e9b\u7ec4\u5408\u4f18\u5316\u95ee\u9898\u7684\u7b97\u6cd5\uff0c\u5b83\u901a\u5e38\u4f7f\u7528\u9012\u5f52\u6765\u5b9e\u73b0\u3002\u51fd\u6570\u6307\u9488\u53ef\u4ee5\u7528\u4e8e\u5b9e\u73b0\u56de\u6eaf\u6cd5\u7b97\u6cd5\u7684\u4e00\u4e9b\u5173\u952e\u90e8\u5206\u3002<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528\u56de\u6eaf\u6cd5\u6765\u8ba1\u7b97\u6392\u5217\u7684\u793a\u4f8b\uff1a<\/p>\n
#include<\/span> <\/span><\/span><\/span><\/code>#include<\/span> <\/span><\/span><\/span><\/code>
<\/span><\/code>typedef<\/span> void<\/span> (*callback_func_t<\/span>)<\/span>(const<\/span> int<\/span> *, size_t<\/span>)<\/span><\/span>;<\/span><\/code>
<\/span><\/code>void<\/span> swap<\/span>(int<\/span> *a, int<\/span> *b)<\/span><\/span><\/span><\/code>{<\/span><\/code>    int<\/span> tmp = *a;<\/span><\/code>    *a = *b;<\/span><\/code>    *b = tmp;<\/span><\/code>}<\/span><\/code>
<\/span><\/code>void<\/span> permute<\/span>(int<\/span> *nums, size_t<\/span> len, size_t<\/span> depth, callback_func_t<\/span> callback)<\/span> <\/span>{<\/span><\/code>    if<\/span> (depth == len)<\/span><\/code>    {<\/span><\/code>        callback(nums, len);<\/span><\/code>        return<\/span>;<\/span><\/code>    }<\/span><\/code>    for<\/span> (size_t<\/span> i = depth; i < len; i++)<\/span><\/code>    {<\/span><\/code>        swap(&nums[depth], &nums[i]);<\/span><\/code>        permute(nums, len, depth + 1<\/span>, callback);<\/span><\/code>        swap(&nums[depth], &nums[i]);<\/span><\/code>    }<\/span><\/code>}<\/span><\/code>
<\/span><\/code>void<\/span> print_array<\/span>(const<\/span> int<\/span> *arr, size_t<\/span> len)<\/span><\/span><\/span><\/code>{<\/span><\/code>    for<\/span> (size_t<\/span> i = 0<\/span>; i < len; i++) <\/span><\/code>    { <\/span><\/code>      printf<\/span>(\"%d \"<\/span>, arr[i]); }<\/span><\/code>      printf<\/span>(\"n\"<\/span>); <\/span><\/code>  }<\/span><\/code>}<\/span><\/code>
<\/span><\/code>int<\/span> main<\/span>()<\/span><\/span><\/span><\/code>{<\/span><\/code>  int<\/span> nums[] = {1<\/span>, 2<\/span>, 3<\/span>};<\/span><\/code>  permute(nums, sizeof<\/span>(nums) \/ sizeof<\/span>(int<\/span>), 0<\/span>, print_array); <\/span><\/code>  return<\/span> 0<\/span>;<\/span><\/code>}<\/span><\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u51fd\u6570 permute\uff0c\u7528\u4e8e\u8ba1\u7b97\u7ed9\u5b9a\u6570\u7ec4\u7684\u6392\u5217\u3002<\/p>\n
\u5728 permute \u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u9012\u5f52\u6765\u751f\u6210\u6240\u6709\u53ef\u80fd\u7684\u6392\u5217\uff0c\u5e76\u4f7f\u7528\u51fd\u6570\u6307\u9488 callback \u6765\u6307\u5b9a\u6bcf\u5f53\u6211\u4eec\u751f\u6210\u4e00\u4e2a\u6392\u5217\u65f6\u5e94\u8be5\u8c03\u7528\u7684\u51fd\u6570\u3002<\/p>\n
\u5728\u672c\u4f8b\u4e2d\uff0c\u6211\u4eec\u5c06 print_array \u51fd\u6570\u4f5c\u4e3a\u56de\u8c03\u51fd\u6570\u4f20\u9012\u7ed9\u4e86 permute \u51fd\u6570\u3002\u8fd9\u610f\u5473\u7740\u6bcf\u5f53 permute \u51fd\u6570\u751f\u6210\u4e00\u4e2a\u6392\u5217\u65f6\uff0c\u5b83\u90fd\u4f1a\u8c03\u7528 print_array \u51fd\u6570\u6765\u6253\u5370\u8fd9\u4e2a\u6392\u5217\u3002<\/p>\n
\u5728 main \u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5305\u542b\u4e09\u4e2a\u6574\u6570\u7684\u6570\u7ec4 nums\uff0c\u5e76\u4f7f\u7528 permute \u51fd\u6570\u6765\u8ba1\u7b97\u8fd9\u4e2a\u6570\u7ec4\u7684\u6240\u6709\u6392\u5217\u3002\u5728\u6bcf\u6b21\u751f\u6210\u4e00\u4e2a\u6392\u5217\u65f6\uff0cpermute \u51fd\u6570\u90fd\u4f1a\u8c03\u7528 print_array \u51fd\u6570\u6765\u6253\u5370\u8fd9\u4e2a\u6392\u5217\u3002<\/p>\n
\u591a\u6001\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\u7684\u4e00\u4e2a\u91cd\u8981\u6982\u5ff5\uff0c\u5b83\u5141\u8bb8\u6211\u4eec\u5728\u4e0d\u77e5\u9053\u5bf9\u8c61\u7c7b\u578b\u7684\u60c5\u51b5\u4e0b\u8c03\u7528\u76f8\u5e94\u7684\u51fd\u6570\u3002\u867d\u7136 C \u8bed\u8a00\u4e0d\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u8bed\u8a00\uff0c\u4f46\u6211\u4eec\u4ecd\u7136\u53ef\u4ee5\u4f7f\u7528\u51fd\u6570\u6307\u9488\u6765\u5b9e\u73b0\u591a\u6001\u3002<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528\u51fd\u6570\u6307\u9488\u5b9e\u73b0\u591a\u6001\u7684\u793a\u4f8b\uff1a<\/p>\n
#include<\/span> <\/span><\/span><\/span><\/code>#include<\/span> <\/span><\/span><\/span><\/code>
<\/span><\/code>typedef<\/span> struct<\/span> shape<\/span><\/span><\/span><\/code>{<\/span><\/code>    void<\/span> (*draw)(struct shape *);<\/span><\/code>} shape_t<\/span>;<\/span><\/code>
<\/span><\/code>typedef<\/span> struct<\/span> circle<\/span><\/span><\/span><\/code>{<\/span><\/code>    shape_t<\/span> shape;<\/span><\/code>    int<\/span> x;<\/span><\/code>    int<\/span> y;<\/span><\/code>    int<\/span> r;<\/span><\/code>} circle_t<\/span>;<\/span><\/code>
<\/span><\/code>typedef<\/span> struct<\/span> rectangle<\/span><\/span><\/span><\/code>{<\/span><\/code>    shape_t<\/span> shape;<\/span><\/code>    int<\/span> x;<\/span><\/code>    int<\/span> y;<\/span><\/code>    int<\/span> w;<\/span><\/code>    int<\/span> h;<\/span><\/code>} rectangle_t<\/span>;<\/span><\/code>
<\/span><\/code>void<\/span> circle_draw<\/span>(shape_t<\/span> *shape)<\/span><\/span><\/span><\/code>{<\/span><\/code>    circle_t<\/span> *circle = (circle_t<\/span> *)shape;<\/span><\/code>    printf<\/span>(\"Drawing a circle at (%d, %d) with radius %d.n\"<\/span>, circle->x, circle->y, circle->r);<\/span><\/code>}<\/span><\/code>
<\/span><\/code>void<\/span> rectangle_draw<\/span>(shape_t<\/span> *shape)<\/span><\/span><\/span><\/code>{<\/span><\/code>    rectangle_t<\/span> *rectangle = (rectangle_t<\/span> *)shape;<\/span><\/code>    printf<\/span>(\"Drawing a rectangle at (%d, %d) with width %d and height %d.n\"<\/span>, rectangle->x, rectangle->y, rectangle->w, rectangle->h);<\/span><\/code>}<\/span><\/code>
<\/span><\/code>int<\/span> main<\/span>()<\/span><\/span><\/span><\/code>{<\/span><\/code>    circle_t<\/span> circle =<\/span><\/code>    {<\/span><\/code>        .shape = {circle_draw},<\/span><\/code>        .x = 10<\/span>,<\/span><\/code>        .y = 20<\/span>,<\/span><\/code>        .r = 5<\/span>,<\/span><\/code>    };<\/span><\/code>    rectangle_t<\/span> rectangle =<\/span><\/code>    {<\/span><\/code>        .shape = {rectangle_draw},<\/span><\/code>        .x = 30<\/span>,<\/span><\/code>        .y = 40<\/span>,<\/span><\/code>        .w = 15<\/span>,<\/span><\/code>        .h = 20<\/span>,<\/span><\/code>    };<\/span><\/code>    shape_t<\/span> *shapes[] = {(shape_t<\/span> *)&circle, (shape_t<\/span> *)&rectangle};<\/span><\/code>    for<\/span> (size_t<\/span> i = 0<\/span>; i < sizeof<\/span>(shapes) \/ sizeof<\/span>(shape_t<\/span> *); i++)<\/span><\/code>    {<\/span><\/code>        shapes[i]->draw(shapes[i]); <\/span><\/code>     }<\/span><\/code>     return<\/span> 0<\/span>;<\/span><\/code>  }<\/span><\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a shape \u7ed3\u6784\u4f53\uff0c\u5b83\u6709\u4e00\u4e2a\u51fd\u6570\u6307\u9488 draw\uff0c\u7528\u4e8e\u7ed8\u5236\u8be5\u5f62\u72b6\u3002<\/p>\n
\u6211\u4eec\u8fd8\u5b9a\u4e49\u4e86\u4e24\u4e2a\u5f62\u72b6\uff1acircle \u548c rectangle\uff0c\u5b83\u4eec\u5206\u522b\u5305\u542b\u5b83\u4eec\u81ea\u5df1\u7684\u5c5e\u6027\u548c\u4e00\u4e2a\u6307\u5411 shape \u7ed3\u6784\u4f53\u7684\u6307\u9488\u3002\u6bcf\u4e2a\u5f62\u72b6\u90fd\u5b9a\u4e49\u4e86\u81ea\u5df1\u7684 draw \u51fd\u6570\uff0c\u7528\u4e8e\u7ed8\u5236\u8be5\u5f62\u72b6\u3002<\/p>\n
\u5728 main \u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a shape_t \u7c7b\u578b\u7684\u6570\u7ec4\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u4e2a circle \u548c\u4e00\u4e2a rectangle\u3002\u6211\u4eec\u4f7f\u7528\u4e00\u4e2a\u5faa\u73af\u6765\u904d\u5386\u8fd9\u4e2a\u6570\u7ec4\uff0c\u5e76\u4f7f\u7528\u6bcf\u4e2a\u5f62\u72b6\u7684 draw \u51fd\u6570\u6765\u7ed8\u5236\u8be5\u5f62\u72b6\u3002<\/p>\n
\u6ce8\u610f\uff0c\u5c3d\u7ba1 shapes \u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u7c7b\u578b\u4e3a shape_t *\uff0c\u4f46\u6211\u4eec\u4ecd\u7136\u53ef\u4ee5\u8c03\u7528\u6bcf\u4e2a\u5143\u7d20\u7684 draw \u51fd\u6570\uff0c\u56e0\u4e3a circle \u548c rectangle \u90fd\u662f\u4ece shape_t \u6d3e\u751f\u51fa\u6765\u7684\uff0c\u5b83\u4eec\u90fd\u5305\u542b\u4e00\u4e2a draw \u51fd\u6570\u6307\u9488\u3002<\/p>\n
\u8fd9\u4e2a\u4f8b\u5b50\u6f14\u793a\u4e86\u5982\u4f55\u4f7f\u7528\u51fd\u6570\u6307\u9488\u6765\u5b9e\u73b0\u591a\u6001\u3002\u5c3d\u7ba1 C \u8bed\u8a00\u4e0d\u652f\u6301\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\uff0c\u4f46\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u7ed3\u6784\u4f53\u548c\u51fd\u6570\u6307\u9488\u6765\u5b9e\u73b0\u7c7b\u4f3c\u7684\u6982\u5ff5\u3002<\/p>\n
\u603b\u7ed3<\/p>\n
\u51fd\u6570\u6307\u9488\u662f\u4e00\u79cd\u5f3a\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u7528\u4e8e\u5b9e\u73b0\u8bb8\u591a\u4e0d\u540c\u7684\u7f16\u7a0b\u6a21\u5f0f\u548c\u7b97\u6cd5\u3002<\/p>\n
\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u4ecb\u7ecd\u4e86\u51fd\u6570\u6307\u9488\u7684\u57fa\u672c\u6982\u5ff5\u548c\u8bed\u6cd5\uff0c\u5e76\u63d0\u4f9b\u4e86\u4e00\u4e9b\u9ad8\u7ea7\u5e94\u7528\u573a\u666f\u7684\u4ee3\u7801\u793a\u4f8b\uff0c\u5305\u62ec\u56de\u8c03\u51fd\u6570\u3001\u51fd\u6570\u6307\u9488\u6570\u7ec4\u3001\u51fd\u6570\u6307\u9488\u4f5c\u4e3a\u53c2\u6570\u3001\u51fd\u6570\u6307\u9488\u4e0e\u9012\u5f52\u3001\u51fd\u6570\u6307\u9488\u4e0e\u591a\u6001\u7b49\u3002<\/p>\n
\u4f7f\u7528\u51fd\u6570\u6307\u9488\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u7f16\u5199\u66f4\u52a0\u7075\u6d3b\u548c\u901a\u7528\u7684\u4ee3\u7801\uff0c\u5e76\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u91cd\u7528\u6027\u548c\u53ef\u6269\u5c55\u6027\u3002<\/p>\n
\u539f\u6587\uff1a<\/p>\n","protected":false},"excerpt":{"rendered":"
\u51fd\u6570\u6307\u9488\u662f\u4e00\u79cd\u975e\u5e38\u5f3a\u5927\u7684\u7f16\u7a0b\u5de5\u5177\uff0c\u5b83\u53ef\u4ee5\u8ba9\u6211\u4eec\u4ee5\u66f4\u52a0\u7075\u6d3b\u7684\u65b9\u5f0f\u7f16\u5199\u7a0b\u5e8f\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u5c06\u4ecb\u7ecd 6 \u4e2a\u51fd\u6570\u6307\u9488<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[264,265,266,262,263],"_links":{"self":[{"href":"https:\/\/www.gzlcy.cn\/index.php?rest_route=\/wp\/v2\/posts\/166"}],"collection":[{"href":"https:\/\/www.gzlcy.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gzlcy.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gzlcy.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gzlcy.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=166"}],"version-history":[{"count":0,"href":"https:\/\/www.gzlcy.cn\/index.php?rest_route=\/wp\/v2\/posts\/166\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.gzlcy.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=166"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gzlcy.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=166"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gzlcy.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=166"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}