{"id":43995,"date":"2025-06-16T14:28:24","date_gmt":"2025-06-16T06:28:24","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/43995.html"},"modified":"2025-06-16T14:28:24","modified_gmt":"2025-06-16T06:28:24","slug":"40-c-%e8%af%ad%e8%a8%80%e6%97%a5%e6%9c%9f%e4%b8%8e%e6%97%b6%e9%97%b4%e5%87%bd%e6%95%b0%e8%af%a6%e8%a7%a3%ef%bc%9atime%e3%80%81ctime%e3%80%81difftime%e3%80%81clock%ef%bc%88%e5%90%ab-utc-%e6%9c%ac","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/43995.html","title":{"rendered":"40 C \u8bed\u8a00\u65e5\u671f\u4e0e\u65f6\u95f4\u51fd\u6570\u8be6\u89e3\uff1atime\u3001ctime\u3001difftime\u3001clock\uff08\u542b UTC\/\u672c\u5730\u65f6\u95f4\u8f6c\u6362\uff09"},"content":{"rendered":"<h2>1\u00a0UTC \u65f6\u95f4\u4e0e\u672c\u5730\u65f6\u95f4<\/h2>\n<h3>1.1\u00a0UTC \u65f6\u95f4<\/h3>\n<ul>\n<li>\u5b9a\u4e49&#xff1a;<span style=\"color:#fe2c24\">UTC&#xff08;Coordinated Universal Time&#xff0c;\u534f\u8c03\u4e16\u754c\u65f6&#xff09;\u662f\u5168\u7403\u7edf\u4e00\u7684\u65f6\u95f4\u6807\u51c6<\/span><span style=\"color:null\">&#xff0c;\u4ee5\u539f\u5b50\u949f\u7684\u9ad8\u7cbe\u5ea6\u8ba1\u65f6\u4e3a\u57fa\u7840&#xff0c;\u72ec\u7acb\u4e8e\u5730\u7403\u81ea\u8f6c\u3002<\/span><\/li>\n<li>\u7279\u70b9&#xff1a;\n<ul>\n<li><span style=\"color:#fe2c24\">\u4e0d\u53d7\u5730\u7406\u4f4d\u7f6e\u6216\u65f6\u533a\u5f71\u54cd&#xff0c;\u662f\u5168\u7403\u5404\u65f6\u533a\u7edf\u4e00\u53c2\u8003\u7684\u65f6\u95f4\u57fa\u51c6<\/span>\u3002<\/li>\n<li>\u901a\u8fc7\u5f15\u5165\u95f0\u79d2&#xff08;\u6bcf\u5e74\u6700\u591a\u589e\u52a0\u6216\u51cf\u5c11 1 \u79d2&#xff09;\u8fdb\u884c\u8c03\u6574&#xff0c;\u4ee5\u8865\u507f\u5730\u7403\u81ea\u8f6c\u901f\u5ea6\u7684\u5fae\u5c0f\u53d8\u5316\u3002<\/li>\n<li>\u786e\u4fdd\u4e0e\u57fa\u4e8e\u5730\u7403\u81ea\u8f6c\u7684\u5929\u6587\u65f6\u95f4&#xff08;UT1&#xff09;\u4e4b\u95f4\u7684\u504f\u5dee\u4e0d\u8d85\u8fc7 0.9 \u79d2\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u793a\u4f8b&#xff1a;2025-05-20\u00a017:20:00 UTC \u8868\u793a\u5168\u7403\u7edf\u4e00\u7684\u65f6\u95f4\u70b9\u3002<\/li>\n<\/ul>\n<h3>1.2 \u672c\u5730\u65f6\u95f4<\/h3>\n<ul>\n<li>\u5b9a\u4e49&#xff1a;<span style=\"color:#fe2c24\">\u672c\u5730\u65f6\u95f4&#xff08;Local Time&#xff09;\u00a0<\/span><span style=\"color:#fe2c24\">\u662f\u6307\u5c06\u534f\u8c03\u4e16\u754c\u65f6&#xff08;UTC&#xff09;\u6839\u636e\u6240\u5728\u65f6\u533a\u7684\u504f\u79fb\u91cf\u8fdb\u884c\u8c03\u6574\u540e\u7684\u65f6\u95f4<\/span><span style=\"color:null\">&#xff0c;\u7528\u4e8e\u6ee1\u8db3\u65e5\u5e38\u751f\u6d3b\u4e2d\u5bf9\u65f6\u95f4\u663e\u793a\u548c\u4f7f\u7528\u7684\u9700\u6c42\u3002<\/span><\/li>\n<li>\u65f6\u533a&#xff08;Time Zone&#xff09;&#xff1a;\n<ul>\n<li><span style=\"color:#fe2c24\">\u5168\u7403\u88ab\u5212\u5206\u4e3a\u00a024 \u4e2a\u4e3b\u8981\u65f6\u533a&#xff0c;\u76f8\u90bb\u65f6\u533a\u4e4b\u95f4\u901a\u5e38\u76f8\u5dee\u00a01 \u5c0f\u65f6<\/span>\u3002<\/li>\n<li><span style=\"color:#fe2c24\">\u90e8\u5206\u56fd\u5bb6\u6216\u5730\u533a\u91c7\u7528\u00a030 \u5206\u949f\u6216 45 \u5206\u949f\u00a0\u7684\u975e\u6574\u70b9\u65f6\u533a\u504f\u79fb&#xff0c;\u5982\u5370\u5ea6&#xff08;UTC&#043;5:30&#xff09;\u3001\u5c3c\u6cca\u5c14&#xff08;UTC&#043;5:45&#xff09;<\/span>\u3002<\/li>\n<li><span style=\"color:#fe2c24\">\u65f6\u533a\u901a\u5e38\u4ee5\u00a0UTC&#043;X\u00a0\u6216\u00a0UTC\u2212X\u00a0\u7684\u5f62\u5f0f\u8868\u793a&#xff1a;<\/span>\n<ul>\n<li><span style=\"color:#fe2c24\">UTC&#043;8&#xff08;\u5982\u5317\u4eac\u65f6\u95f4&#xff09;\u8868\u793a\u6bd4 UTC \u5feb 8 \u5c0f\u65f6<\/span>\u3002<\/li>\n<li><span style=\"color:#fe2c24\">UTC\u22125&#xff08;\u5982\u7f8e\u56fd\u4e1c\u90e8\u6807\u51c6\u65f6\u95f4&#xff09;\u8868\u793a\u6bd4 UTC \u6162 5 \u5c0f\u65f6<\/span>\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u590f\u4ee4\u65f6&#xff08;Daylight Saving Time, DST&#xff09;&#xff1a;\n<ul>\n<li><span style=\"color:#fe2c24\">\u67d0\u4e9b\u5730\u533a\u5728\u590f\u5b63\u5b9e\u884c\u590f\u4ee4\u65f6&#xff0c;\u901a\u5e38\u5c06\u65f6\u95f4\u63d0\u524d 1 \u5c0f\u65f6&#xff08;\u628a\u949f\u8868\u7684\u65f6\u95f4\u4ece\u5f53\u524d\u65f6\u95f4\u5411\u540e\u8c03\u5feb 1 \u5c0f\u65f6&#xff09;&#xff0c;\u4ee5\u66f4\u597d\u5730\u5229\u7528\u81ea\u7136\u5149\u7167&#xff0c;\u8282\u7ea6\u80fd\u6e90<\/span>\u3002<\/li>\n<li>\u590f\u4ee4\u65f6\u7684\u5f00\u59cb\u4e0e\u7ed3\u675f\u65f6\u95f4\u56e0\u56fd\u5bb6\u548c\u5730\u533a\u800c\u5f02&#xff0c;\u53ef\u80fd\u5bfc\u81f4\u672c\u5730\u65f6\u95f4\u4e0e UTC \u7684\u504f\u79fb\u5728\u4e00\u5e74\u4e2d\u53d1\u751f\u4e34\u65f6\u53d8\u5316\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u793a\u4f8b&#xff1a;\u5047\u8bbe\u5f53\u524d UTC \u65f6\u95f4\u4e3a&#xff1a;2025-05-20\u00a012:00:00\n<ul>\n<li>\u5317\u4eac&#xff08;UTC&#043;8&#xff09;\u00a0\u7684\u672c\u5730\u65f6\u95f4\u4e3a&#xff1a;2025-05-20\u00a020:00:00<\/li>\n<li>\u7ebd\u7ea6&#xff08;UTC\u22125&#xff0c;\u975e\u590f\u4ee4\u65f6\u671f\u95f4&#xff09;\u00a0\u7684\u672c\u5730\u65f6\u95f4\u4e3a&#xff1a;2025-05-20\u00a007:00:00<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>1.3\u00a0UTC \u4e0e\u672c\u5730\u65f6\u95f4\u7684\u8f6c\u6362<\/h3>\n<ul>\n<li>\u8f6c\u6362\u516c\u5f0f&#xff1a;\n<ul>\n<li><span style=\"color:#fe2c24\">\u672c\u5730\u65f6\u95f4 &#061; UTC \u65f6\u95f4 &#043; \u65f6\u533a\u504f\u79fb\u91cf<\/span><span style=\"color:null\">&#xff08;\u9700\u8003\u8651\u662f\u5426\u542f\u7528\u590f\u4ee4\u65f6&#xff09;<\/span><\/li>\n<li><span style=\"color:#fe2c24\">UTC \u65f6\u95f4 &#061; \u672c\u5730\u65f6\u95f4 &#8211; \u65f6\u533a\u504f\u79fb\u91cf<\/span><span style=\"color:null\">&#xff08;\u9700\u8003\u8651\u662f\u5426\u542f\u7528\u590f\u4ee4\u65f6&#xff09;<\/span><\/li>\n<\/ul>\n<\/li>\n<li>\u793a\u4f8b&#xff1a;\n<ul>\n<li>\u82e5\u5317\u4eac\u65f6\u95f4&#xff08;UTC&#043;8&#xff0c;\u975e\u590f\u4ee4\u65f6&#xff09;\u4e3a 2025-05-20\u00a010:00:00&#xff0c;\u5219\u5bf9\u5e94\u7684 UTC \u65f6\u95f4\u4e3a&#xff1a;\n<ul>\n<li>UTC \u65f6\u95f4 &#061; 10:00 &#8211; 8 &#061; 02:00&#xff0c;\u5373 2025-05-20 02:00:00<\/li>\n<\/ul>\n<\/li>\n<li>\u82e5 UTC \u65f6\u95f4\u4e3a 2025-05-20 12:00:00&#xff0c;\u5219\u7ebd\u7ea6\u65f6\u95f4&#xff08;UTC-5&#xff0c;\u975e\u590f\u4ee4\u65f6&#xff09;\u4e3a&#xff1a;\n<ul>\n<li>\u672c\u5730\u65f6\u95f4 &#061; 12:00 &#043; (-5) &#061; 07:00&#xff0c;\u5373 2025-05-20 07:00:00<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>1.4 \u65f6\u95f4\u6233<\/h3>\n<ul>\n<li>\u5b9a\u4e49&#xff1a;<span style=\"color:#fe2c24\">\u65f6\u95f4\u6233&#xff08;Timestamp&#xff09;\u901a\u5e38\u8868\u793a\u81ea\u00a01970 \u5e74 1 \u6708 1 \u65e5 00:00:00 UTC&#xff08;\u79f0\u4e3a Unix \u7eaa\u5143&#xff09;\u4ee5\u6765\u7ecf\u8fc7\u7684\u79d2\u6570<\/span>\u3002<\/li>\n<li>\u7279\u70b9&#xff1a;\n<ul>\n<li><span style=\"color:#fe2c24\">\u662f UTC \u65f6\u95f4\u7684\u4e00\u79cd\u6570\u503c\u5316\u8868\u793a\u5f62\u5f0f&#xff0c;\u4e0d\u4f9d\u8d56\u4e8e\u4efb\u4f55\u65f6\u533a<\/span>\u3002<\/li>\n<li>\u4fbf\u4e8e\u7a0b\u5e8f\u8fdb\u884c\u65f6\u95f4\u7684\u6bd4\u8f83\u3001\u5b58\u50a8\u548c\u8ba1\u7b97\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h2 style=\"background-color:transparent\">2 time() \u51fd\u6570<\/h2>\n<h3>2.1 \u51fd\u6570\u539f\u578b<\/h3>\n<p>#include &lt;time.h&gt;  \/\/ \u5fc5\u987b\u5305\u542b\u6b64\u5934\u6587\u4ef6\u624d\u80fd\u4f7f\u7528 time() \u51fd\u6570<\/p>\n<p>time_t time(time_t *timer); <\/p>\n<h3>2.2 \u529f\u80fd\u8bf4\u660e<\/h3>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span style=\"color:#fe2c24\">time() \u51fd\u6570\u7528\u4e8e\u83b7\u53d6\u5f53\u524d\u7684\u65e5\u5386\u65f6\u95f4&#xff08;\u5373\u4ece 1970 \u5e74 1 \u6708 1 \u65e5 00:00:00 UTC \u5f00\u59cb\u7ecf\u8fc7\u7684\u79d2\u6570&#xff0c;\u4e0d\u5305\u62ec\u95f0\u79d2&#xff09;&#xff0c;\u5e76\u5c06\u5176\u4f5c\u4e3a time_t \u7c7b\u578b\u7684\u503c\u8fd4\u56de<\/span>\u3002<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span style=\"color:#fe2c24\">time_t \u7c7b\u578b\u901a\u5e38\u662f\u4e00\u4e2a\u957f\u6574\u578b&#xff08;\u5982 long \u6216 long long&#xff09;&#xff0c;\u7528\u4e8e\u8868\u793a\u65f6\u95f4\u6233&#xff08;\u79d2\u6570&#xff09;<\/span>\u3002\u5728 printf \u4e2d\u8f93\u51fa\u65f6&#xff0c;\u5e38\u7528 %ld \u6216 %lld \u4f5c\u4e3a\u5360\u4f4d\u7b26&#xff0c;\u5177\u4f53\u53d6\u51b3\u4e8e\u5e73\u53f0\u3002\u6700\u5e38\u7528\u5199\u6cd5&#xff08;\u642d\u914d\u5f3a\u5236\u8f6c\u6362&#xff09;&#xff1a;<span style=\"color:#1c7331\">printf(&#034;%ld&#034;, (long)now)\u00a0<\/span>\u3002<\/p>\n<ul>\n<li>\u53c2\u6570&#xff1a;\n<ul>\n<li><span style=\"color:#fe2c24\">timer&#xff1a;\u4e00\u4e2a\u6307\u5411 time_t \u7c7b\u578b\u53d8\u91cf\u7684\u6307\u9488<\/span><span style=\"color:null\">\u3002<\/span>\n<ul>\n<li><span style=\"color:#fe2c24\">\u5982\u679c\u8be5\u53c2\u6570\u4e0d\u4e3a NULL&#xff0c;\u5219\u5f53\u524d\u65f6\u95f4\u4e5f\u4f1a\u88ab\u5b58\u50a8\u5230\u8be5\u6307\u9488\u6307\u5411\u7684\u53d8\u91cf\u4e2d<\/span><span style=\"color:null\">&#xff1b;<\/span><\/li>\n<li><span style=\"color:#fe2c24\">\u82e5\u4e3a NULL \u6216 0&#xff0c;\u5219\u4ec5\u8fd4\u56de\u65f6\u95f4\u503c<\/span>\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\n<ul>\n<li><span style=\"color:#fe2c24\">\u6210\u529f\u65f6\u8fd4\u56de\u5f53\u524d\u7684\u65f6\u95f4\u503c&#xff08;\u4ee5\u79d2\u4e3a\u5355\u4f4d\u7684 time_t \u7c7b\u578b&#xff09;<\/span>\u3002<\/li>\n<li><span style=\"color:#fe2c24\">\u5982\u679c\u5931\u8d25&#xff08;\u4f8b\u5982\u7cfb\u7edf\u65e0\u6cd5\u83b7\u53d6\u5f53\u524d\u65f6\u95f4&#xff09;&#xff0c;\u8fd4\u56de (time_t)(-1)<\/span>\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>2.3 \u6ce8\u610f\u4e8b\u9879<\/h3>\n<li>\u7cbe\u5ea6\u9650\u5236&#xff1a;<span style=\"color:#be191c\">time() \u7684\u7cbe\u5ea6\u662f\u79d2\u7ea7&#xff0c;\u4e0d\u80fd\u83b7\u53d6\u6beb\u79d2\u6216\u5fae\u79d2\u7ea7\u522b\u7684\u65f6\u95f4<\/span>\u3002<\/li>\n<li>\u7b49\u4ef7\u7528\u6cd5&#xff1a;<span style=\"color:#be191c\">time(0) \u548c time(NULL) \u5b8c\u5168\u7b49\u4ef7&#xff0c;\u5747\u7528\u4e8e\u83b7\u53d6\u5f53\u524d\u65f6\u95f4\u6233\u800c\u4e0d\u5b58\u50a8\u7ed3\u679c<\/span>\u3002<\/li>\n<li>\u8de8\u5e73\u53f0\u517c\u5bb9\u6027&#xff1a;<span style=\"color:#be191c\">time() \u662f\u6807\u51c6 C \u5e93\u51fd\u6570&#xff0c;\u5728\u6240\u6709\u652f\u6301 C \u6807\u51c6\u5e93\u7684\u5e73\u53f0\u4e0a\u90fd\u53ef\u7528<\/span>\u3002<\/li>\n<li>\u907f\u514d\u9891\u7e41\u8c03\u7528&#xff1a;<span style=\"color:#be191c\">\u867d\u7136\u6027\u80fd\u901a\u5e38\u4e0d\u662f\u95ee\u9898&#xff0c;\u4f46\u5728\u9ad8\u5e76\u53d1\u6216\u5b9e\u65f6\u7cfb\u7edf\u4e2d\u5e94\u8c28\u614e\u4f7f\u7528<\/span>\u3002<\/li>\n<li>\u9519\u8bef\u5904\u7406&#xff1a;<span style=\"color:#be191c\">\u867d\u7136\u5f88\u5c11\u53d1\u751f\u9519\u8bef&#xff0c;\u4f46\u5efa\u8bae\u68c0\u67e5\u8fd4\u56de\u503c\u662f\u5426\u4e3a (time_t)-1<\/span>\u3002<\/li>\n<h3>2.4 \u5e94\u7528\u573a\u666f<\/h3>\n<li>\u8bb0\u5f55\u65e5\u5fd7\u65f6\u95f4\u6233&#xff1a;\u7528\u4e8e\u751f\u6210\u5e26\u6709\u65f6\u95f4\u4fe1\u606f\u7684\u65e5\u5fd7\u5185\u5bb9\u3002<\/li>\n<li>\u7a0b\u5e8f\u8fd0\u884c\u8ba1\u65f6&#xff1a;\u53ef\u4ee5\u7ed3\u5408\u4e24\u6b21\u8c03\u7528 time() \u6765\u8ba1\u7b97\u7a0b\u5e8f\u6267\u884c\u65f6\u95f4&#xff08;\u9002\u7528\u4e8e\u79d2\u7ea7\u7cbe\u5ea6&#xff09;\u3002<\/li>\n<li>\u8d85\u65f6\u5224\u65ad&#xff1a;\u7528\u4e8e\u5224\u65ad\u67d0\u4e2a\u64cd\u4f5c\u662f\u5426\u5728\u89c4\u5b9a\u65f6\u95f4\u5185\u5b8c\u6210\u3002<\/li>\n<li>\u6587\u4ef6\/\u6570\u636e\u6709\u6548\u671f\u63a7\u5236&#xff1a;\u5982\u751f\u6210\u5e26\u6709\u65f6\u6548\u6027\u7684\u7f13\u5b58\u6587\u4ef6\u6216\u4ee4\u724c\u3002<\/li>\n<li>\u7528\u6237\u754c\u9762\u663e\u793a\u65f6\u95f4&#xff1a;\u5728 GUI \u6216 CLI \u4e2d\u663e\u793a\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4\u3002<\/li>\n<li>\u751f\u6210\u552f\u4e00\u6807\u8bc6\u7b26&#xff1a;\u57fa\u4e8e\u65f6\u95f4\u6233\u751f\u6210\u7b80\u5355\u7684\u552f\u4e00 ID&#xff08;\u6ce8\u610f\u91cd\u590d\u98ce\u9669&#xff09;\u3002<\/li>\n<h3 style=\"background-color:transparent\">2.5 \u793a\u4f8b\u7a0b\u5e8f<\/h3>\n<p>#include &lt;stdio.h&gt;<br \/>\n#include &lt;time.h&gt; \/\/ \u5fc5\u987b\u5305\u542b\u6b64\u5934\u6587\u4ef6\u624d\u80fd\u4f7f\u7528 time() \u51fd\u6570<\/p>\n<p>int main()<br \/>\n{<br \/>\n    time_t current_time; \/\/ \u58f0\u660e\u4e00\u4e2a time_t \u7c7b\u578b\u7684\u53d8\u91cf\u6765\u5b58\u50a8\u5f53\u524d\u65f6\u95f4\u6233<\/p>\n<p>    \/\/ \u60c5\u51b5 1&#xff1a;\u53c2\u6570\u4e3a NULL&#xff0c;\u4ec5\u8fd4\u56de\u5f53\u524d\u65f6\u95f4\u503c<br \/>\n    time_t returned_time &#061; time(NULL);<br \/>\n    \/\/ \u53ef\u9009\u7684\u68c0\u67e5\u8fd4\u56de\u503c<br \/>\n    if (returned_time &#061;&#061; (time_t)-1)<br \/>\n    {<br \/>\n        printf(&#034;\u65e0\u6cd5\u83b7\u53d6\u5f53\u524d\u65f6\u95f4&#xff08;\u53c2\u6570\u4e3a NULL \u7684\u60c5\u51b5&#xff09;\u3002\\\\n&#034;);<br \/>\n    }<br \/>\n    else<br \/>\n    {<br \/>\n        printf(&#034;\u60c5\u51b51&#xff08;\u53c2\u6570\u4e3a NULL&#xff09;&#xff1a;\u5f53\u524d\u65f6\u95f4\u6233&#xff1a;%ld\\\\n&#034;, (long)returned_time);<br \/>\n    }<\/p>\n<p>    \/\/ \u60c5\u51b5 2&#xff1a;\u53c2\u6570\u4e3a 0&#xff0c;\u4ec5\u8fd4\u56de\u5f53\u524d\u65f6\u95f4\u503c<br \/>\n    printf(&#034;\u60c5\u51b52&#xff08;\u53c2\u6570\u4e3a 0&#xff09;&#xff1a;\u5f53\u524d\u65f6\u95f4\u6233&#xff1a;%ld\\\\n&#034;, (long)time(0));<\/p>\n<p>    \/\/ \u60c5\u51b5 3&#xff1a;\u53c2\u6570\u4e3a\u975e NULL&#xff0c;\u5f53\u524d\u65f6\u95f4\u4f1a\u88ab\u5b58\u50a8\u5230\u6307\u9488\u6307\u5411\u7684\u53d8\u91cf\u4e2d<br \/>\n    time(&amp;current_time); \/\/ \u4f20\u5165\u53d8\u91cf\u7684\u5730\u5740&#xff0c;\u5c06\u5f53\u524d\u65f6\u95f4\u6233\u5b58\u50a8\u5230\u8be5\u53d8\u91cf\u4e2d<br \/>\n    \/\/ \u4e00\u822c\u4e0d\u68c0\u67e5\u8fd4\u56de\u503c&#xff0c;\u76f4\u63a5\u4f7f\u7528<br \/>\n    printf(&#034;\u60c5\u51b53&#xff08;\u53c2\u6570\u4e3a\u975e NULL&#xff09;&#xff1a;\u5f53\u524d\u65f6\u95f4\u6233&#xff1a;%ld\\\\n&#034;, (long)current_time);<\/p>\n<p>    return 0;<br \/>\n} <\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u7a0b\u5e8f\u5728 VS Code \u4e2d\u7684\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\u6240\u793a&#xff1a;<\/p>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"128\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250616062823-684fb9876e728.png\" width=\"550\" \/><\/p>\n<hr \/>\n<h2>3 ctime() \u51fd\u6570<\/h2>\n<h3>3.1 \u51fd\u6570\u539f\u578b<\/h3>\n<p>#include &lt;time.h&gt;  \/\/ \u5fc5\u987b\u5305\u542b\u6b64\u5934\u6587\u4ef6\u624d\u80fd\u4f7f\u7528 ctime() \u51fd\u6570<\/p>\n<p>char *ctime(const time_t *timer); <\/p>\n<h3>3.2 \u529f\u80fd\u8bf4\u660e<\/h3>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span style=\"color:#fe2c24\">ctime() \u51fd\u6570\u7528\u4e8e\u5c06 time_t \u7c7b\u578b\u8868\u793a\u7684\u65f6\u95f4\u503c&#xff08;\u5373\u65f6\u95f4\u6233&#xff09;\u8f6c\u6362\u4e3a\u4e00\u4e2a\u53ef\u8bfb\u6027\u826f\u597d\u7684\u5b57\u7b26\u4e32\u5f62\u5f0f&#xff0c;\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u8868\u793a\u672c\u5730\u65f6\u95f4\u7684\u5b57\u7b26\u4e32<\/span>\u3002<\/p>\n<ul>\n<li>\u53c2\u6570&#xff1a;\n<ul>\n<li><span style=\"color:#fe2c24\">timer&#xff1a;\u6307\u5411\u4e00\u4e2a time_t \u7c7b\u578b\u53d8\u91cf\u7684\u6307\u9488&#xff0c;\u8868\u793a\u8981\u8f6c\u6362\u7684\u65f6\u95f4\u503c<\/span>\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\n<ul>\n<li><span style=\"color:#fe2c24\">\u6210\u529f\u65f6\u8fd4\u56de\u4e00\u4e2a\u6307\u5411\u9759\u6001\u5b57\u7b26\u6570\u7ec4\u7684\u6307\u9488&#xff0c;\u8be5\u6570\u7ec4\u4e2d\u4fdd\u5b58\u4e86\u683c\u5f0f\u5316\u540e\u7684\u65f6\u95f4\u5b57\u7b26\u4e32<\/span>&#xff1b;<\/li>\n<li><span style=\"color:#fe2c24\">\u5982\u679c\u5931\u8d25&#xff08;\u5982\u4f20\u5165\u7684 timer \u4e3a NULL \u6216\u7cfb\u7edf\u5185\u90e8\u9519\u8bef&#xff09;&#xff0c;\u5219\u8fd4\u56de NULL<\/span>\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>3.3 \u6ce8\u610f\u4e8b\u9879<\/h3>\n<li>\u81ea\u52a8\u6362\u884c\u7b26&#xff1a;<span style=\"color:#be191c\">\u8fd4\u56de\u7684\u5b57\u7b26\u4e32\u672b\u5c3e\u5305\u542b\u4e00\u4e2a \\\\n \u6362\u884c\u7b26<\/span>\u3002<\/li>\n<li>\u7ed3\u679c\u4e0d\u53ef\u4fee\u6539&#xff1a;<span style=\"color:#be191c\">\u8fd4\u56de\u7684\u5b57\u7b26\u4e32\u662f\u53ea\u8bfb\u7684&#xff0c;\u4e0d\u5e94\u5c1d\u8bd5\u4fee\u6539\u5176\u5185\u5bb9<\/span>\u3002<\/li>\n<li>\u4f9d\u8d56\u7cfb\u7edf\u672c\u5730\u65f6\u533a&#xff1a;<span style=\"color:#be191c\">ctime() \u8fd4\u56de\u7684\u662f\u672c\u5730\u65f6\u95f4&#xff0c;\u53d7\u64cd\u4f5c\u7cfb\u7edf\u65f6\u533a\u8bbe\u7f6e\u5f71\u54cd<\/span>\u3002<\/li>\n<li>\u8fd4\u56de\u503c\u9700\u68c0\u67e5&#xff1a;<span style=\"color:#be191c\">\u867d\u7136\u5f88\u5c11\u5931\u8d25&#xff0c;\u4f46\u5e94\u68c0\u67e5\u662f\u5426\u4e3a NULL<\/span>\u3002<\/li>\n<h3>3.4 \u5e94\u7528\u573a\u666f<\/h3>\n<li>\u6253\u5370\u5f53\u524d\u65f6\u95f4&#xff1a;\u5feb\u901f\u8f93\u51fa\u7a0b\u5e8f\u8fd0\u884c\u65f6\u7684\u5f53\u524d\u65f6\u95f4\u3002<\/li>\n<li>\u65e5\u5fd7\u8bb0\u5f55&#xff1a;\u5728\u65e5\u5fd7\u4fe1\u606f\u524d\u52a0\u4e0a\u53ef\u8bfb\u7684\u65f6\u95f4\u6233\u3002<\/li>\n<li>\u8c03\u8bd5\u8f85\u52a9&#xff1a;\u5728\u8c03\u8bd5\u8fc7\u7a0b\u4e2d\u67e5\u770b\u5f53\u524d\u65f6\u95f4\u3002<\/li>\n<li>\u7b80\u5355\u65f6\u95f4\u663e\u793a&#xff1a;\u9002\u7528\u4e8e\u4e0d\u9700\u8981\u81ea\u5b9a\u4e49\u683c\u5f0f\u7684\u754c\u9762\u6216\u63a7\u5236\u53f0\u8f93\u51fa\u3002<\/li>\n<h3 style=\"background-color:transparent\">3.5 \u793a\u4f8b\u7a0b\u5e8f<\/h3>\n<p>#include &lt;stdio.h&gt;<br \/>\n#include &lt;time.h&gt; \/\/ \u5fc5\u987b\u5305\u542b\u6b64\u5934\u6587\u4ef6\u624d\u80fd\u4f7f\u7528 time() \u548c ctime() \u51fd\u6570<\/p>\n<p>int main()<br \/>\n{<br \/>\n    time_t current_time; \/\/ \u58f0\u660e\u4e00\u4e2a time_t \u7c7b\u578b\u7684\u53d8\u91cf\u6765\u5b58\u50a8\u5f53\u524d\u65f6\u95f4\u6233<\/p>\n<p>    \/\/ \u60c5\u51b5 1&#xff1a;\u53c2\u6570\u4e3a NULL&#xff0c;\u4ec5\u8fd4\u56de\u5f53\u524d\u65f6\u95f4\u503c<br \/>\n    time_t returned_time &#061; time(NULL);<br \/>\n    \/\/ \u53ef\u9009\u7684\u68c0\u67e5\u8fd4\u56de\u503c<br \/>\n    if (returned_time &#061;&#061; (time_t)-1)<br \/>\n    {<br \/>\n        printf(&#034;\u65e0\u6cd5\u83b7\u53d6\u5f53\u524d\u65f6\u95f4&#xff08;\u53c2\u6570\u4e3a NULL \u7684\u60c5\u51b5&#xff09;\u3002\\\\n&#034;);<br \/>\n    }<br \/>\n    else<br \/>\n    {<br \/>\n        printf(&#034;\u60c5\u51b51&#xff08;\u53c2\u6570\u4e3a NULL&#xff09;&#xff1a;\u5f53\u524d\u65f6\u95f4\u6233&#xff1a;%ld\\\\n&#034;, (long)returned_time);<br \/>\n        \/\/ \u4f7f\u7528 ctime \u8f93\u51fa\u53ef\u8bfb\u65f6\u95f4\u5b57\u7b26\u4e32<br \/>\n        printf(&#034;\u60c5\u51b51 \u5bf9\u5e94\u7684\u672c\u5730\u65f6\u95f4&#xff1a;%s&#034;, ctime(&amp;returned_time)); \/\/ \u4e0d\u9700\u8981\u6362\u884c\u7b26&#xff0c;ctime() \u51fd\u6570\u4f1a\u81ea\u52a8\u6dfb\u52a0<br \/>\n    }<\/p>\n<p>    \/\/ \u60c5\u51b5 2&#xff1a;\u53c2\u6570\u4e3a\u975e NULL&#xff0c;\u5f53\u524d\u65f6\u95f4\u4f1a\u88ab\u5b58\u50a8\u5230\u6307\u9488\u6307\u5411\u7684\u53d8\u91cf\u4e2d<br \/>\n    time(&amp;current_time); \/\/ \u4f20\u5165\u53d8\u91cf\u7684\u5730\u5740&#xff0c;\u5c06\u5f53\u524d\u65f6\u95f4\u6233\u5b58\u50a8\u5230\u8be5\u53d8\u91cf\u4e2d<br \/>\n    printf(&#034;\u60c5\u51b52&#xff08;\u53c2\u6570\u4e3a\u975e NULL&#xff09;&#xff1a;\u5f53\u524d\u65f6\u95f4\u6233&#xff1a;%ld\\\\n&#034;, (long)current_time);<br \/>\n    \/\/ \u4f7f\u7528 ctime \u8f93\u51fa\u53ef\u8bfb\u65f6\u95f4\u5b57\u7b26\u4e32<br \/>\n    printf(&#034;\u60c5\u51b52 \u5bf9\u5e94\u7684\u672c\u5730\u65f6\u95f4&#xff1a;%s&#034;, ctime(&amp;current_time)); \/\/ \u4e0d\u9700\u8981\u6362\u884c\u7b26&#xff0c;ctime() \u51fd\u6570\u4f1a\u81ea\u52a8\u6dfb\u52a0<\/p>\n<p>    return 0;<br \/>\n} <\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u7a0b\u5e8f\u5728 VS Code \u4e2d\u7684\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\u6240\u793a&#xff1a;<\/p>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"163\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250616062823-684fb9877d90f.png\" width=\"550\" \/><\/p>\n<ul><\/ul>\n<hr \/>\n<h2>4 difftime() \u51fd\u6570<\/h2>\n<h3>4.1 \u51fd\u6570\u539f\u578b<\/h3>\n<p>#include &lt;time.h&gt;  \/\/ \u5fc5\u987b\u5305\u542b\u6b64\u5934\u6587\u4ef6\u624d\u80fd\u4f7f\u7528 difftime() \u51fd\u6570<\/p>\n<p>double difftime(time_t time2, time_t time1); <\/p>\n<h3>4.2 \u529f\u80fd\u8bf4\u660e<\/h3>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span style=\"color:#fe2c24\">difftime() \u51fd\u6570\u7528\u4e8e\u8ba1\u7b97\u4e24\u4e2a\u65f6\u95f4\u70b9\u4e4b\u95f4\u7684\u65f6\u95f4\u5dee&#xff08;\u4ee5\u79d2\u4e3a\u5355\u4f4d&#xff09;\u3002\u8fd9\u4e24\u4e2a\u65f6\u95f4\u70b9\u901a\u5e38\u662f\u7531 time() \u51fd\u6570\u83b7\u53d6\u7684 time_t \u7c7b\u578b\u7684\u65f6\u95f4\u6233<\/span>\u3002<\/p>\n<ul>\n<li>\u53c2\u6570&#xff1a;\n<ul>\n<li><span style=\"color:#fe2c24\">time2&#xff1a;\u7ed3\u675f\u65f6\u95f4&#xff0c;\u4e00\u4e2a\u00a0time_t\u00a0\u7c7b\u578b\u503c<\/span>\u3002<\/li>\n<li><span style=\"color:#fe2c24\">time1&#xff1a;\u5f00\u59cb\u65f6\u95f4&#xff0c;\u4e00\u4e2a\u00a0time_t\u00a0\u7c7b\u578b\u503c<\/span>\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\n<ul>\n<li><span style=\"color:#fe2c24\">\u8fd4\u56de\u00a0time2 &#8211; time1\u00a0\u7684\u5dee\u503c&#xff0c;\u7ed3\u679c\u4ee5\u00a0double\u00a0\u7c7b\u578b\u8868\u793a&#xff0c;\u5355\u4f4d\u4e3a\u79d2<\/span>&#xff1b;<\/li>\n<li><span style=\"color:#fe2c24\">\u5982\u679c\u00a0time2\u00a0\u6bd4\u00a0time1\u00a0\u5c0f&#xff08;\u5373\u7ed3\u675f\u65f6\u95f4\u65e9\u4e8e\u5f00\u59cb\u65f6\u95f4&#xff09;&#xff0c;\u5219\u8fd4\u56de\u8d1f\u6570<\/span>\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>4.3 \u6ce8\u610f\u4e8b\u9879<\/h3>\n<li>\u8fd4\u56de\u503c\u4e3a double&#xff1a;<span style=\"color:#be191c\">\u53ef\u4ee5\u8868\u793a\u975e\u6574\u6570\u79d2\u7684\u65f6\u95f4\u5dee&#xff08;\u5982\u67d0\u4e9b\u7cfb\u7edf\u652f\u6301\u66f4\u9ad8\u7cbe\u5ea6\u65f6\u95f4&#xff09;&#xff0c;\u9002\u5408\u66f4\u7cbe\u786e\u7684\u8ba1\u65f6<\/span>\u3002<\/li>\n<li>\u987a\u5e8f\u5f71\u54cd\u7ed3\u679c&#xff1a;<span style=\"color:#be191c\">difftime(time2, time1) \u8868\u793a\u4ece time1 \u5230 time2 \u7684\u65f6\u95f4\u5dee&#xff0c;\u6ce8\u610f\u53c2\u6570\u987a\u5e8f<\/span>\u3002<\/li>\n<li>\u5e38\u7528\u4e8e\u6027\u80fd\u6d4b\u8bd5&#xff1a;<span style=\"color:#be191c\">\u9002\u7528\u4e8e\u7c97\u7565\u6d4b\u91cf\u4ee3\u7801\u6267\u884c\u65f6\u95f4&#xff08;\u5982\u79d2\u7ea7\u6216\u4e9a\u79d2\u7ea7&#xff09;<\/span>\u3002<\/li>\n<li>\u53ef\u4ee5\u8de8\u65f6\u533a\u6bd4\u8f83&#xff1a;<span style=\"color:#be191c\">\u65f6\u95f4\u6233\u672c\u8d28\u4e0a\u662f UTC \u65f6\u95f4&#xff0c;\u4e0d\u53d7\u672c\u5730\u65f6\u533a\u5f71\u54cd&#xff0c;\u56e0\u6b64\u9002\u5408\u7528\u4e8e\u8de8\u65f6\u533a\u7684\u65f6\u95f4\u5dee\u8ba1\u7b97<\/span>\u3002<\/li>\n<h3>4.4 \u5e94\u7528\u573a\u666f<\/h3>\n<li>\u7a0b\u5e8f\u8fd0\u884c\u65f6\u95f4\u7edf\u8ba1&#xff1a;\u8bb0\u5f55\u67d0\u6bb5\u4ee3\u7801\u6267\u884c\u524d\u540e\u7684\u65f6\u95f4\u6233&#xff0c;\u5e76\u8ba1\u7b97\u8017\u65f6\u3002<\/li>\n<li>\u8d85\u65f6\u63a7\u5236&#xff1a;\u5224\u65ad\u67d0\u4e2a\u64cd\u4f5c\u662f\u5426\u5728\u89c4\u5b9a\u65f6\u95f4\u5185\u5b8c\u6210\u3002<\/li>\n<li>\u7528\u6237\u884c\u4e3a\u5206\u6790&#xff1a;\u8bb0\u5f55\u7528\u6237\u64cd\u4f5c\u4e4b\u95f4\u7684\u95f4\u9694\u65f6\u95f4\u3002<\/li>\n<li>\u65e5\u5fd7\u8bb0\u5f55&#xff1a;\u8f93\u51fa\u4e8b\u4ef6\u53d1\u751f\u7684\u65f6\u95f4\u95f4\u9694&#xff0c;\u4fbf\u4e8e\u540e\u7eed\u5206\u6790\u3002<\/li>\n<li>\u5b9a\u65f6\u4efb\u52a1\u8c03\u5ea6&#xff1a;\u7528\u4e8e\u5224\u65ad\u662f\u5426\u6ee1\u8db3\u89e6\u53d1\u6761\u4ef6\u3002<\/li>\n<h3>4.5 \u793a\u4f8b\u7a0b\u5e8f<\/h3>\n<p>#include &lt;stdio.h&gt;<br \/>\n#include &lt;time.h&gt; \/\/ \u5fc5\u987b\u5305\u542b\u6b64\u5934\u6587\u4ef6\u624d\u80fd\u4f7f\u7528 time() \u548c difftime() \u51fd\u6570<\/p>\n<p>int main()<br \/>\n{<br \/>\n    time_t start_time, end_time; \/\/ \u5b9a\u4e49\u4e24\u4e2a time_t \u53d8\u91cf\u7528\u4e8e\u4fdd\u5b58\u65f6\u95f4\u6233<\/p>\n<p>    printf(&#034;\u7a0b\u5e8f\u5f00\u59cb\u8ba1\u65f6&#8230;\\\\n&#034;);<br \/>\n    start_time &#061; time(NULL); \/\/ \u83b7\u53d6\u5f00\u59cb\u65f6\u95f4<\/p>\n<p>    \/\/ \u6a21\u62df\u8017\u65f6\u64cd\u4f5c&#xff08;\u901a\u8fc7\u5faa\u73af\u5ef6\u65f6&#xff09;<br \/>\n    for (unsigned long long i &#061; 0; i &lt; 10000000000LL; &#043;&#043;i)<br \/>\n        ; \/\/ \u7b80\u5355\u5ef6\u8fdf<\/p>\n<p>    end_time &#061; time(NULL); \/\/ \u83b7\u53d6\u7ed3\u675f\u65f6\u95f4<\/p>\n<p>    \/\/ \u4f7f\u7528 difftime \u8ba1\u7b97\u65f6\u95f4\u5dee<br \/>\n    double elapsed_seconds &#061; difftime(end_time, start_time);<\/p>\n<p>    printf(&#034;\u7a0b\u5e8f\u7ed3\u675f\u8ba1\u65f6\u3002\\\\n&#034;);<br \/>\n    printf(&#034;\u7ecf\u8fc7\u7684\u65f6\u95f4&#xff1a;%lf \u79d2\\\\n&#034;, elapsed_seconds);<\/p>\n<p>    return 0;<br \/>\n} <\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u7a0b\u5e8f\u5728 VS Code \u4e2d\u7684\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\u6240\u793a&#xff1a;<\/p>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"141\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250616062823-684fb9878eff4.png\" width=\"550\" \/><\/p>\n<hr \/>\n<h2>5 clock() \u51fd\u6570<\/h2>\n<h3>5.1 \u51fd\u6570\u539f\u578b<\/h3>\n<p>#include &lt;time.h&gt;  \/\/ \u5fc5\u987b\u5305\u542b\u6b64\u5934\u6587\u4ef6\u624d\u80fd\u4f7f\u7528 clock() \u51fd\u6570<\/p>\n<p>clock_t clock(void); <\/p>\n<h3>5.2 \u529f\u80fd\u8bf4\u660e<\/h3>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span style=\"color:#fe2c24\">clock() \u51fd\u6570\u8fd4\u56de\u81ea\u7a0b\u5e8f\u542f\u52a8\u4ee5\u6765&#xff08;\u6216\u7a0b\u5e8f\u8fdb\u5165\u5f53\u524d\u72b6\u6001\u4ee5\u6765&#xff09;\u7684\u5904\u7406\u5668\u65f6\u95f4&#xff08;CPU \u65f6\u95f4&#xff09;&#xff0c;\u5355\u4f4d\u901a\u5e38\u662f \u201c\u65f6\u949f\u6ef4\u7b54\u201d&#xff08;clock ticks&#xff09;<\/span><span style=\"color:null\">\u3002\u8be5\u65f6\u95f4\u4ee5 clock_t \u7c7b\u578b\u8868\u793a&#xff0c;\u901a\u5e38\u7528\u4e8e\u6d4b\u91cf\u4e00\u6bb5\u4ee3\u7801\u7684 CPU \u6267\u884c\u65f6\u95f4\u3002<\/span><\/p>\n<ul>\n<li>\u8fd4\u56de\u503c&#xff1a;\n<ul>\n<li><span style=\"color:#fe2c24\">\u8fd4\u56de\u5f53\u524d\u8fdb\u7a0b\u4f7f\u7528\u7684\u5904\u7406\u5668\u65f6\u95f4&#xff08;CPU \u65f6\u95f4&#xff09;&#xff0c;\u5355\u4f4d\u4e3a CLOCKS_PER_SEC&#xff08;\u6bcf\u79d2\u7684\u65f6\u949f\u6ef4\u7b54\u6570&#xff09;&#xff0c;\u800c\u4e0d\u662f\u79d2\u6570<\/span>&#xff1b;\n<ul>\n<li>\u793a\u4f8b&#xff1a;\u5982\u679c CLOCKS_PER_SEC \u662f 1000000&#xff0c;\u5219 clock() \u8fd4\u56de\u7684\u503c\u9664\u4ee5 1000000 \u53ef\u4ee5\u5f97\u5230\u79d2\u6570\u3002<\/li>\n<li>\u56e0\u6b64&#xff0c;<span style=\"color:#fe2c24\">clock() \u8fd4\u56de\u7684\u6ef4\u7b54\u6570\u9664\u4ee5 CLOCKS_PER_SEC \u53ef\u4ee5\u5f97\u5230\u4ee5\u79d2\u4e3a\u5355\u4f4d\u7684 CPU \u65f6\u95f4<\/span>\u3002<\/li>\n<\/ul>\n<\/li>\n<li><span style=\"color:#fe2c24\">\u8fd4\u56de (clock_t)(-1)&#xff08;\u901a\u5e38\u662f -1&#xff09;&#xff0c;\u5e76\u53ef\u80fd\u8bbe\u7f6e errno&#xff08;\u4f46\u6807\u51c6\u672a\u660e\u786e\u8981\u6c42\u8bbe\u7f6e errno&#xff0c;\u5177\u4f53\u884c\u4e3a\u4f9d\u8d56\u5b9e\u73b0&#xff09;<\/span>\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>5.3 \u6ce8\u610f\u4e8b\u9879<\/h3>\n<li>\u4ec5\u9650\u4e8e\u5f53\u524d\u8fdb\u7a0b&#xff1a;<span style=\"color:#be191c\">\u53ea\u80fd\u7528\u4e8e\u6d4b\u91cf\u5f53\u524d\u8fdb\u7a0b\u5185\u7684 CPU \u4f7f\u7528\u60c5\u51b5<\/span>\u3002<\/li>\n<li>\u7cbe\u5ea6\u95ee\u9898&#xff1a;<span style=\"color:#be191c\">\u5728\u67d0\u4e9b\u7cfb\u7edf\u4e0a&#xff0c;CLOCKS_PER_SEC \u7684\u503c\u53ef\u80fd\u8f83\u4f4e&#xff08;\u5982 100&#xff09;&#xff0c;\u5bfc\u81f4 clock() \u7684\u5206\u8fa8\u7387\u4e0d\u9ad8&#xff0c;\u9002\u5408\u7c97\u7565\u4f30\u8ba1\u800c\u975e\u9ad8\u7cbe\u5ea6\u8ba1\u65f6<\/span>\u3002<\/li>\n<li>\u5e73\u53f0\u5dee\u5f02\u6027&#xff1a;<span style=\"color:#be191c\">\u4e0d\u540c\u64cd\u4f5c\u7cfb\u7edf\u5b9e\u73b0\u53ef\u80fd\u6709\u6240\u4e0d\u540c&#xff0c;\u5c24\u5176\u6ce8\u610f CLOCKS_PER_SEC \u7684\u503c<\/span>\u3002<\/li>\n<li>\u8fd4\u56de\u7c7b\u578b&#xff1a;<span style=\"color:#be191c\">\u8fd4\u56de\u7c7b\u578b\u662f clock_t&#xff0c;\u9700\u6839\u636e\u5177\u4f53\u5e73\u53f0\u5c06\u5176\u8f6c\u6362\u4e3a\u79d2&#xff08;\u9664\u4ee5 CLOCKS_PER_SEC&#xff09;\u6216\u5176\u4ed6\u65f6\u95f4\u5355\u4f4d\u8fdb\u884c\u89e3\u91ca<\/span>\u3002<\/li>\n<h3>5.4 \u5e94\u7528\u573a\u666f<\/h3>\n<li>\u6027\u80fd\u5206\u6790&#xff1a;\u8bc4\u4f30\u7279\u5b9a\u7b97\u6cd5\u6216\u4ee3\u7801\u6bb5\u7684\u6267\u884c\u6548\u7387\u3002<\/li>\n<li>\u8c03\u8bd5\u8f85\u52a9&#xff1a;\u5e2e\u52a9\u5f00\u53d1\u8005\u4e86\u89e3\u67d0\u90e8\u5206\u4ee3\u7801\u662f\u5426\u8017\u65f6\u8fc7\u957f\u3002<\/li>\n<li>\u8d44\u6e90\u76d1\u63a7&#xff1a;\u76d1\u6d4b\u7a0b\u5e8f\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u5bf9 CPU \u8d44\u6e90\u7684\u5360\u7528\u60c5\u51b5\u3002<\/li>\n<li>\u6d4b\u8bd5\u5de5\u5177\u5f00\u53d1&#xff1a;\u6784\u5efa\u81ea\u52a8\u5316\u6d4b\u8bd5\u6846\u67b6\u4e2d\u7684\u4e00\u90e8\u5206&#xff0c;\u7528\u4e8e\u5ea6\u91cf\u6d4b\u8bd5\u6848\u4f8b\u7684\u6267\u884c\u901f\u5ea6\u3002<\/li>\n<h3>5.5 \u793a\u4f8b\u7a0b\u5e8f<\/h3>\n<p>#include &lt;stdio.h&gt;<br \/>\n#include &lt;time.h&gt; \/\/ \u5fc5\u987b\u5305\u542b\u6b64\u5934\u6587\u4ef6\u624d\u80fd\u4f7f\u7528 clock() \u51fd\u6570<\/p>\n<p>int main()<br \/>\n{<br \/>\n    \/\/ \u8bb0\u5f55\u5f00\u59cb\u65f6\u95f4<br \/>\n    clock_t start_time &#061; clock();<\/p>\n<p>    \/\/ \u6a21\u62df\u4e00\u4e2a\u8017\u65f6\u7684\u64cd\u4f5c<br \/>\n    for (unsigned long long i &#061; 0; i &lt; 10000000000LL; &#043;&#043;i)<br \/>\n        ; \/\/ \u7b80\u5355\u5ef6\u8fdf<\/p>\n<p>    \/\/ \u8bb0\u5f55\u7ed3\u675f\u65f6\u95f4<br \/>\n    clock_t end_time &#061; clock();<\/p>\n<p>    \/\/ \u8ba1\u7b97\u6d88\u8017\u7684 CPU \u65f6\u95f4&#xff0c;\u5e76\u5c06\u5176\u8f6c\u6362\u4e3a\u79d2(\u9664\u4ee5 CLOCKS_PER_SEC)<br \/>\n    double cpu_time_used &#061; ((double)(end_time &#8211; start_time)) \/ CLOCKS_PER_SEC;<\/p>\n<p>    printf(&#034;\u6a21\u62df\u64cd\u4f5c\u6d88\u8017\u7684 CPU \u65f6\u95f4: %lf \u79d2\\\\n&#034;, cpu_time_used);<\/p>\n<p>    return 0;<br \/>\n} <\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u7a0b\u5e8f\u5728 VS Code \u4e2d\u7684\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\u6240\u793a&#xff1a;<\/p>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"87\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250616062823-684fb9879ca19.png\" width=\"550\" \/><\/p>\n<hr \/>\n<h2>6\u00a0\u65e5\u671f\u4e0e\u65f6\u95f4\u51fd\u6570\u603b\u7ed3<\/h2>\n<table>\n<tr>\u51fd\u6570\u540d\u529f\u80fd\u53c2\u6570\u8fd4\u56de\u503c<\/tr>\n<tbody>\n<tr>\n<td style=\"text-align:center\"><span style=\"color:#fe2c24\">time<\/span><\/td>\n<td><span style=\"color:#fe2c24\">\u83b7\u53d6\u5f53\u524d\u65f6\u95f4\u6233&#xff08;\u81ea 1970-01-01 00:00:00 UTC \u8d77\u7ecf\u8fc7\u7684\u79d2\u6570&#xff09;<\/span><\/td>\n<td>time_t *timer&#xff1a;\u53ef\u4e3a NULL&#xff0c;\u7528\u4e8e\u63a5\u6536\u65f6\u95f4\u6233<\/td>\n<td>\u6210\u529f\u8fd4\u56de\u65f6\u95f4\u6233&#xff08;time_t \u7c7b\u578b&#xff09;&#xff0c;\u5931\u8d25\u8fd4\u56de (time_t)-1<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:center\"><span style=\"color:#fe2c24\">ctime<\/span><\/td>\n<td><span style=\"color:#fe2c24\">\u5c06\u65f6\u95f4\u6233\u8f6c\u6362\u4e3a\u53ef\u8bfb\u7684\u672c\u5730\u65f6\u95f4\u5b57\u7b26\u4e32&#xff08;\u683c\u5f0f\u56fa\u5b9a&#xff0c;\u5e26\u6362\u884c\u7b26&#xff09;<\/span><\/td>\n<td>const time_t *timer&#xff1a;\u6307\u5411\u65f6\u95f4\u6233\u7684\u6307\u9488<\/td>\n<td>\u6210\u529f\u8fd4\u56de\u6307\u5411\u9759\u6001\u5b57\u7b26\u4e32\u7684\u6307\u9488&#xff0c;\u5931\u8d25\u8fd4\u56de NULL<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:center\"><span style=\"color:#fe2c24\">difftime<\/span><\/td>\n<td><span style=\"color:#fe2c24\">\u8ba1\u7b97\u4e24\u4e2a\u65f6\u95f4\u70b9\u4e4b\u95f4\u7684\u65f6\u95f4\u5dee&#xff08;\u4ee5\u79d2\u4e3a\u5355\u4f4d&#xff09;<\/span><\/td>\n<td>time_t time2, time_t time1&#xff1a;\u4e24\u4e2a\u65f6\u95f4\u70b9<\/td>\n<td>\u8fd4\u56de time2 &#8211; time1 \u7684\u5dee\u503c&#xff08;double \u7c7b\u578b&#xff0c;\u5355\u4f4d\u4e3a\u79d2&#xff09;<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:center\"><span style=\"color:#fe2c24\">clock<\/span><\/td>\n<td><span style=\"color:#fe2c24\">\u83b7\u53d6\u5f53\u524d\u8fdb\u7a0b\u4f7f\u7528\u7684 CPU \u65f6\u95f4&#xff08;\u4ece\u7a0b\u5e8f\u542f\u52a8\u5f00\u59cb\u8ba1\u7b97&#xff09;<\/span><\/td>\n<td>\u65e0\u53c2\u6570<\/td>\n<td>\u6210\u529f\u8fd4\u56de CPU \u4f7f\u7528\u65f6\u95f4&#xff08;\u4ee5\u65f6\u949f\u5468\u671f\u4e3a\u5355\u4f4d&#xff09;&#xff0c;\u5931\u8d25\u8fd4\u56de (clock_t)-1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8865\u5145\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>time_t \u7c7b\u578b&#xff1a;<span style=\"color:#be191c\">\u901a\u5e38\u4e3a\u957f\u6574\u578b&#xff08;\u5982 long \u6216 long long&#xff09;&#xff0c;\u7528\u4e8e\u8868\u793a\u81ea Unix \u7eaa\u5143&#xff08;1970-01-01 00:00:00 UTC&#xff09;\u4ee5\u6765\u7ecf\u8fc7\u7684\u79d2\u6570&#xff0c;\u5373\u65f6\u95f4\u6233<\/span>\u3002<\/li>\n<li>ctime() \u7684\u7ebf\u7a0b\u5b89\u5168\u6027<span style=\"color:#be191c\">&#xff1a;<\/span><span style=\"color:#be191c\">\u8be5\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u6307\u5411\u5185\u90e8\u9759\u6001\u7f13\u51b2\u533a\u7684\u6307\u9488&#xff0c;\u5185\u5bb9\u5728\u6bcf\u6b21\u8c03\u7528\u65f6\u4f1a\u88ab\u8986\u76d6<\/span>\u3002<\/li>\n<li>difftime() \u7684\u4f18\u52bf&#xff1a;<span style=\"color:#be191c\">\u8be5\u51fd\u6570\u57fa\u4e8e\u6807\u51c6 C \u5b9a\u4e49&#xff0c;\u80fd\u591f\u51c6\u786e\u8ba1\u7b97\u4e24\u4e2a\u65f6\u95f4\u70b9\u4e4b\u95f4\u7684\u5dee\u503c&#xff0c;\u5355\u4f4d\u4e3a\u79d2&#xff08;\u652f\u6301\u5c0f\u6570&#xff09;&#xff0c;\u9002\u7528\u4e8e\u8de8\u5e73\u53f0\u3001\u8de8\u65f6\u533a\u7684\u65f6\u95f4\u5dee\u6bd4\u8f83&#xff0c;\u662f\u63a8\u8350\u7684\u6807\u51c6\u65b9\u6cd5<\/span>\u3002<\/li>\n<li>clock() \u7684\u5c40\u9650\u6027&#xff1a;<span style=\"color:#be191c\">\u5b83\u8fd4\u56de\u7684\u662f\u7a0b\u5e8f\u6240\u5360\u7528\u7684 CPU \u65f6\u95f4&#xff0c;\u800c\u975e\u771f\u5b9e\u4e16\u754c\u65f6\u95f4&#xff08;wall-clock time&#xff09;&#xff0c;\u56e0\u6b64\u4e0d\u9002\u5408\u7528\u4e8e\u6d4b\u91cf I\/O \u64cd\u4f5c\u3001\u7761\u7720\u6216\u7b49\u5f85\u5916\u90e8\u4e8b\u4ef6\u7684\u65f6\u95f4<\/span>\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb1.1k\u6b21\uff0c\u70b9\u8d5e18\u6b21\uff0c\u6536\u85cf8\u6b21\u3002\u672c\u6587\u8be6\u89e3 C \u8bed\u8a00\u4e2d\u5904\u7406\u65e5\u671f\u4e0e\u65f6\u95f4\u7684\u56db\u5927\u6838\u5fc3\u51fd\u6570\uff1atime() \u83b7\u53d6\u65f6\u95f4\u6233\uff0cctime() \u8f6c\u65f6\u95f4\u6233\u4e3a\u53ef\u8bfb\u65f6\u95f4\uff0cdifftime() \u8ba1\u7b97\u65f6\u95f4\u5dee\uff0cclock() \u6d4b CPU \u65f6\u95f4\u3002\u901a\u8fc7\u793a\u4f8b\u4ee3\u7801\uff0c\u6e05\u6670\u5c55\u793a\u5404\u51fd\u6570\u7528\u6cd5\u53ca\u6ce8\u610f\u4e8b\u9879\uff0c\u52a9\u529b\u5f00\u53d1\u8005\u9ad8\u6548\u5904\u7406\u65f6\u95f4\u76f8\u5173\u4efb\u52a1\u3002_\u5b8c\u5584\u51fd\u6570time2sec\u7684\u5b9a\u4e49,\u4f7f\u5f97\u7a0b\u5e8f\u6b63\u786e\u8fd0\u884c:<\/p>\n","protected":false},"author":2,"featured_media":43991,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[4068,4067,4073,4071,4072,4070,4069,4074],"topic":[],"class_list":["post-43995","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-c-","tag-c---","tag-clock","tag-ctime","tag-difftime","tag-time","tag-4069","tag-4074"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>40 C 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