{"id":111273,"date":"2026-09-30T20:41:12","date_gmt":"2026-09-30T12:41:12","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/111273.html"},"modified":"2026-09-30T20:41:12","modified_gmt":"2026-09-30T12:41:12","slug":"%e5%b8%b8%e7%94%a8%e7%9a%84%e5%ad%97%e7%ac%a6%e5%87%bd%e6%95%b0%e5%92%8c%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/111273.html","title":{"rendered":"\u5e38\u7528\u7684\u5b57\u7b26\u51fd\u6570\u548c\u5b57\u7b26\u4e32\u51fd\u6570"},"content":{"rendered":"<\/p>\n<h4>\u76ee\u5f55<\/h4>\n<ul>\n<li>\u4e00.\u4e00\u4e2a\u53c2\u6570\u7684\u5b57\u7b26\u51fd\u6570<\/li>\n<li>\n<ul>\n<li>1.\u5b57\u7b26\u5206\u7c7b\u51fd\u6570<\/li>\n<li>2.\u5b57\u7b26\u8f6c\u6362\u51fd\u6570<\/li>\n<\/ul>\n<\/li>\n<li>\u4e8c.\u4e24\u4e2a\u53c2\u6570 \u957f\u5ea6\u4e0d\u53d7\u9650\u7684\u5b57\u7b26\u4e32\u51fd\u6570<\/li>\n<li>\n<ul>\n<li>1.strcpy\u51fd\u6570<\/li>\n<li>2.strcat\u51fd\u6570<\/li>\n<li>3.strcmp\u51fd\u6570<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09.\u4e09\u4e2a\u53c2\u6570 \u957f\u5ea6\u53d7\u9650\u7684\u5b57\u7b26\u4e32\u51fd\u6570<\/li>\n<li>\n<ul>\n<li>1.strncpy\u51fd\u6570<\/li>\n<li>2.strncat\u51fd\u6570<\/li>\n<li>3.strncmp\u51fd\u6570<\/li>\n<\/ul>\n<\/li>\n<li>\u56db.\u5176\u4ed6\u5b57\u7b26\u4e32\u51fd\u6570<\/li>\n<li>\n<ul>\n<li>1.strstr\u51fd\u6570<\/li>\n<li>2.strlen\u51fd\u6570<\/li>\n<li>3.strtok\u51fd\u6570<\/li>\n<li>4.strerror\u51fd\u6570<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>\u4e00.\u4e00\u4e2a\u53c2\u6570\u7684\u5b57\u7b26\u51fd\u6570<\/h2>\n<h3>1.\u5b57\u7b26\u5206\u7c7b\u51fd\u6570<\/h3>\n<p>\u7528\u4e8e\u5224\u65ad\u5b57\u7b26\u7684\u7c7b\u578b&#xff0c;\u4e13\u95e8\u7528\u4e8e\u5b57\u7b26\u5206\u7c7b\u3002 \u9700\u5305\u542b\u5934\u6587\u4ef6 ctpye.h \u4f8b\u5982&#xff1a; isalpha&#xff1a;\u5224\u65ad\u53c2\u6570\u662f\u5426\u662f\u5b57\u6bcd isdigit &#xff1a;\u5224\u65ad\u53c2\u6570\u662f\u5426\u662f\u6570\u5b57<\/p>\n<p>\u7b26\u5408\u6761\u4ef6\u8fd4\u56de\u771f&#xff0c;\u4e0d\u7b26\u5408\u8fd4\u56de\u5047\u3002<\/p>\n<h3>2.\u5b57\u7b26\u8f6c\u6362\u51fd\u6570<\/h3>\n<p>int tolower(int c);\/\/\u5c06\u53c2\u6570\u4ece\u5927\u5199\u8f6c\u4e3a\u5c0f\u5199<br \/>\nint touppper(int c);\/\/\u5c06\u53c2\u6570\u4ece\u5c0f\u5199\u8f6c\u4e3a\u5927\u5199<\/p>\n<p>\u7528\u4e8e\u8f6c\u6362\u5927\u5c0f\u5199\u3002<\/p>\n<h2>\u4e8c.\u4e24\u4e2a\u53c2\u6570 \u957f\u5ea6\u4e0d\u53d7\u9650\u7684\u5b57\u7b26\u4e32\u51fd\u6570<\/h2>\n<h3>1.strcpy\u51fd\u6570<\/h3>\n<p>char* strcpy(char* destination,const char* source);<br \/>\nchar arr1[] &#061; &#034;abc&#034;;<br \/>\nchar arr2[10] &#061; {0};<br \/>\nstrcpy(arr2,arr1);<\/p>\n<p>strcpy\u7528\u4e8e\u62f7\u8d1d\u5b57\u7b26\u4e32&#xff0c;\u5c06 arr1(source) \u7684\u5b57\u7b26\u4e32\u62f7\u5165 arr2(destination)\u3002<\/p>\n<p>\u6ce8\u610f&#xff1a; \u6e90\u5b57\u7b26\u4e32\u5fc5\u987b\u4ee5 \u2018\\\\0\u2019 \u7ed3\u5c3e\u3002 \u4f1a\u5c06\u6e90\u5b57\u7b26\u4e32\u7684 \u2018\\\\0\u2019 \u62f7\u5165\u76ee\u6807\u7a7a\u95f4\u3002 \u76ee\u6807\u7a7a\u95f4\u5fc5\u987b\u8db3\u591f\u5927 \u786e\u4fdd\u80fd\u653e\u5165\u62f7\u8d1d\u7684\u5b57\u7b26\u4e32\u3002 \u76ee\u6807\u7a7a\u95f4\u5fc5\u987b\u53ef\u4fee\u6539\u3002<\/p>\n<p>const char* destination&#xff1b;\/\/error \u76ee\u6807\u7a7a\u95f4\u6b64\u65f6\u4e0d\u80fd\u4fee\u6539<br \/>\nchar* p &#061; &#034;abcd&#034;;\/\/error \u5e38\u91cf\u5b57\u7b26\u4e32\u4e0d\u80fd\u88ab\u4fee\u6539 p\u4e3a\u6307\u9488 \u6307\u5411\u9996\u5b57\u7b26\u7684\u5730\u5740<br \/>\nchar* p[10] &#061; &#034;abcd&#034;;\/\/\u6b64\u65f6 p\u4e3a\u6570\u7ec4\u540d \u6570\u7ec4\u4e2d\u5b58\u653e\u5b57\u7b26\u4e32 \u53ef\u4fee\u6539 <\/p>\n<p>\u6a21\u62df\u5b9e\u73b0&#xff1a;<\/p>\n<p><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">my_strcpy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> dest<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> src<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">assert<\/span><span class=\"token punctuation\">(<\/span>dest <span class=\"token operator\">&amp;&amp;<\/span> src<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u786e\u4fdd\u4e24\u4e2a\u6307\u9488\u975e\u7a7a<\/span><br \/>\n    <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> res <span class=\"token operator\">&#061;<\/span> dest<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>dest<span class=\"token operator\">&#043;&#043;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">*<\/span>src<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token comment\">\/\/\u540e&#043;&#043;\u5148\u7528\u518d\u52a0<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span>     <span class=\"token comment\">\/\/\u901a\u8fc7\u8d4b\u503c\u62f7\u8d1d\u6570\u636e \u5c06&#039;\\\\0&#039;\u8d4b\u503c\u7ed9dest\u540e\u8868\u8fbe\u5f0f\u4e3a 0&#xff0c;while\u7ec8\u6b62\u5faa\u73af<\/span><br \/>\n        <span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u7a7a\u8bed\u53e5<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> res<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u8fd4\u56de\u76ee\u6807\u7a7a\u95f4\u7684\u8d77\u59cb\u5730\u5740<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>2.strcat\u51fd\u6570<\/h3>\n<p>\u548cstrcpy\u51fd\u6570\u5f88\u50cf&#xff0c;strcpy\u4ece\u5f00\u5934\u8986\u76d6\u5230\u2019\\\\0\u2019\u7ed3\u675f&#xff0c;strcat\u4ece\u7ed3\u5c3e\u2019\\\\0\u2019\u5f00\u59cb\u8986\u76d6 \u76f4\u5230\u6574\u4e2a\u6e90\u5b57\u7b26\u4e32\u8ffd\u52a0\u5b8c\u6210\u3002 strcpy \u662f\u66ff\u6362&#xff0c;strcat \u662f\u8ffd\u52a0\u3002<\/p>\n<p>\u6ce8\u610f&#xff1a; \u6e90\u5b57\u7b26\u4e32\u5fc5\u987b\u4ee5 \u2018\\\\0\u2019 \u7ed3\u5c3e\u3002 \u4ece\u76ee\u6807\u5b57\u7b26\u4e32\u7684 \u2018\\\\0\u2019 \u5f00\u59cb\u8ffd\u52a0 \u2018\\\\0\u2019\u88ab\u8986\u76d6&#xff0c;\u5c06\u6e90\u5b57\u7b26\u4e32\u6574\u4f53\u62f7\u5165\u5305\u62ec\u2019\\\\0\u2019\u3002 \u76ee\u6807\u7a7a\u95f4\u5fc5\u987b\u8db3\u591f\u5927 \u786e\u4fdd\u80fd\u653e\u5165\u6e90\u5b57\u7b26\u4e32\u3002 \u76ee\u6807\u7a7a\u95f4\u5fc5\u987b\u53ef\u4fee\u6539\u3002<\/p>\n<p>\u6a21\u62df\u5b9e\u73b0&#xff1a;<\/p>\n<p><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">my_strcat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> dest<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> src<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">assert<\/span><span class=\"token punctuation\">(<\/span>dest <span class=\"token operator\">&amp;&amp;<\/span> src<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u786e\u4fdd\u4e24\u4e2a\u6307\u9488\u975e\u7a7a<\/span><br \/>\n    <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> res <span class=\"token operator\">&#061;<\/span> dest<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>dest<span class=\"token punctuation\">)<\/span><span class=\"token comment\">\/\/\u627e\u5230&#039;\\\\0&#039; \u4e0d\u7528\u518d\u52a0\u4e86<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        dest<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>dest<span class=\"token operator\">&#043;&#043;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">*<\/span>src<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token comment\">\/\/dest\u4ece&#039;\\\\0&#039;\u5f00\u59cb \u901a\u8fc7\u8d4b\u503c\u62f7\u8d1d\u6570\u636e<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u7a7a\u8bed\u53e5<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> res<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u8fd4\u56de\u76ee\u6807\u7a7a\u95f4\u7684\u8d77\u59cb\u5730\u5740<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>strcat\u51fd\u6570\u7684\u6a21\u62df\u5b9e\u73b0 \u76f8\u6bd4 strcpy \u53ea\u591a\u4e86\u4e00\u4e2a\u627e\u2019\\\\0\u2019\u7684while\u5faa\u73af\u3002<\/p>\n<h3>3.strcmp\u51fd\u6570<\/h3>\n<p>\u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u7684\u5927\u5c0f\u3002<\/p>\n<p>int strcmp(const char* str1, const char* str2);<br \/>\nint res &#061; strcmp(&#034;abc&#034;,&#034;abcd&#034;);\/\/&lt;0<\/p>\n<p>\u4ece\u5de6\u5230\u53f3\u6bd4\u8f83\u5b57\u7b26\u7684ASCII\u7801\u5927\u5c0f&#xff0c; \u5b57\u7b26\u76f8\u540c\u5219\u6bd4\u8f83\u4e0b\u4e00\u4e2a\u5b57\u7b26&#xff0c;\u76f4\u5230\u5f97\u51fa\u7ed3\u679c&#xff0c;ASCII\u7801\u503c\u5c0f \u5219\u5c0f&#xff0c;\u8fd4\u56de\u503c\u5c0f\u4e8e0&#xff0c;ASCII\u7801\u503c\u5927&#xff0c;\u8fd4\u56de\u503c\u5927\u4e8e0\u3002\u5982\u679c\u5b8c\u5168\u76f8\u540c\u8fd4\u56de 0\u3002&#039;\\\\0\u2019\u4e5f\u53c2\u4e0e\u6bd4\u8f83 \u5176ASCII\u7801\u503c\u4e3a 0\u3002<\/p>\n<p>if(&#034;abc&#034; &lt; &#034;abcd&#034;)\/\/error<br \/>\n&#8230;<\/p>\n<p>\u76f4\u63a5\u8ba9\u4e24\u4e2a\u5b57\u7b26\u6bd4\u8f83&#xff0c;\u6bd4\u8f83\u7684\u662f\u4e24\u4e2a\u5b57\u7b26\u4e32\u9996\u5b57\u7b26\u7684\u5730\u5740 \u800c\u4e0d\u662f\u5b57\u7b26\u4e32\u7684\u5185\u5bb9\u3002<\/p>\n<p>\u6a21\u62df\u5b9e\u73b0&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">my_strcmp<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> str1<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> str2<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">assert<\/span><span class=\"token punctuation\">(<\/span>str1 <span class=\"token operator\">&amp;&amp;<\/span> str2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>str1 <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">*<\/span>str2<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>str1 <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token comment\">\/\/\u4e24\u4e2a\u5b57\u7b26\u4e32\u5747\u4e3a&#039;\\\\0&#039;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u76f8\u7b49<\/span><br \/>\n        str1<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        str2<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">*<\/span>str1 <span class=\"token operator\">&#8211;<\/span> <span class=\"token operator\">*<\/span>str2<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u5982\u679cstr1&gt;str2 \u8fd4\u56de\u503c&gt;0<\/span><br \/>\n    <span class=\"token comment\">\/\/\u5982\u679cstr1&lt;str2 \u8fd4\u56de\u503c&lt;0<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h2>\u4e09.\u4e09\u4e2a\u53c2\u6570 \u957f\u5ea6\u53d7\u9650\u7684\u5b57\u7b26\u4e32\u51fd\u6570<\/h2>\n<h3>1.strncpy\u51fd\u6570<\/h3>\n<p>char arr1[] &#061; &#034;abc&#034;;<br \/>\nchar arr2[10] &#061; &#034;xxxxxxx&#034;;<br \/>\n\/\/strcpy(arr2,arr1);abc\\\\0xxx<br \/>\n\/\/strncpy(arr2,arr1,3);abcxxxx  (\u53ea\u8986\u76d6\u524d3\u4f4d \u6ca1\u6709&#039;\\\\0&#039;)<br \/>\nstrncpy(arr2,arr1,5);\/\/abc\\\\0\\\\0xx  (\u4f4d\u6570\u4e0d\u591f\u8865&#039;\\\\0&#039;)<\/p>\n<p>\u53ef\u4ee5\u81ea\u884c\u51b3\u5b9a\u62f7\u8d1d\u7684\u4e2a\u6570\u3002<\/p>\n<h3>2.strncat\u51fd\u6570<\/h3>\n<p>char arr1[] &#061; &#034;abc&#034;;<br \/>\nchar arr2[10] &#061; &#034;qq\\\\0xxxxxxx&#034;;<br \/>\nstrncat(arr2,arr1,2);\/\/qqab\\\\0xxxxxxx<\/p>\n<p>\u53ef\u4ee5\u81ea\u884c\u51b3\u5b9a\u8ffd\u52a0\u7684\u4e2a\u6570\u3002\u8986\u76d6\u2019\\\\0\u2019&#xff0c;\u8ffd\u52a0\u5b8c\u6210\u540e\u518d\u52a0\u56de\u4e00\u4e2a\u2019\\\\0\u2019\u3002<\/p>\n<h3>3.strncmp\u51fd\u6570<\/h3>\n<p>char str1[] &#061; &#034;abc&#034;;<br \/>\nchar str2[] &#061; &#034;abe&#034;;<br \/>\nstrncmp(str1, str2, 2);\/\/0 \u76f8\u7b49<\/p>\n<p>\u53ef\u4ee5\u81ea\u884c\u51b3\u5b9a\u6bd4\u8f83\u7684\u5b57\u7b26\u6570\u3002<\/p>\n<h2>\u56db.\u5176\u4ed6\u5b57\u7b26\u4e32\u51fd\u6570<\/h2>\n<h3>1.strstr\u51fd\u6570<\/h3>\n<p>string string \u5728\u5b57\u7b26\u4e32\u4e2d\u627e\u5b57\u7b26\u4e32&#xff08;\u5b50\u5b57\u7b26\u4e32&#xff09;\u3002<\/p>\n<p>char* strstr(const char* str1, const char* str2);<\/p>\n<p>\u5728str1\u4e2d\u627estr2\u662f\u5426\u5b58\u5728&#xff0c;\u5982\u679c\u5b58\u5728 \u8fd4\u56destr1\u4e2d str2\u9996\u5b57\u7b26\u51fa\u73b0\u7684\u5730\u5740&#xff0c;\u627e\u4e0d\u5230\u5219\u8fd4\u56deNULL\u3002<\/p>\n<p>\u6a21\u62df\u5b9e\u73b0&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">my_strstr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> str1<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> str2<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> s1 <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> s2 <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> cur <span class=\"token operator\">&#061;<\/span> str1<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>cur<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        s1 <span class=\"token operator\">&#061;<\/span> cur<span class=\"token punctuation\">;<\/span><br \/>\n        s2 <span class=\"token operator\">&#061;<\/span> str2<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>s1 <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token operator\">*<\/span>s2 <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token operator\">*<\/span>s1<span class=\"token operator\">!&#061;<\/span><span class=\"token char\">&#039;\\\\0&#039;<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token operator\">*<\/span>s2<span class=\"token operator\">!&#061;<\/span><span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token comment\">\/\/\u627e\u5230\u5b57\u7b26 \u4e14\u672a\u7ed3\u675f<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            s1<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            s2<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>s2 <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token comment\">\/\/str2\u5df2\u88ab\u627e\u5230<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> cur<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u8fd4\u56de\u8d77\u59cb\u5730\u5740<\/span><\/p>\n<p>        cur<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u5982\u679c *s1&#061;&#061;&#039;\\\\0&#039;\u5927\u5faa\u73af\u7ed3\u675f&#xff0c;*s2&#061;&#061;&#039;\\\\0&#039; \u5df2\u627e\u5230<\/span><br \/>\n        <span class=\"token comment\">\/\/*s1!&#061;*s2 \u672a\u627e\u5230&#xff0c;cur&#043;1 \u7ee7\u7eed\u627e \u76f4\u5230\u627e\u5230\u6216\u8005\u627e\u4e0d\u5230<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>2.strlen\u51fd\u6570<\/h3>\n<p>size_t strlen(const char*str);<\/p>\n<p>\u7528\u4e8e\u83b7\u53d6\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u3002 \u68c0\u6d4b \u2018\\\\0\u2019 \u524d\u7684\u5b57\u7b26\u4e2a\u6570\u3002 \u6ce8\u610f&#xff1a; \u53c2\u6570\u6307\u5411\u7684\u5b57\u7b26\u4e32\u5fc5\u987b\u5305\u542b \u2018\\\\0\u2019 \u3002 \u9700\u5305\u542b\u5934\u6587\u4ef6 &lt;string.h&gt; \u3002 \u8fd4\u56de\u503c\u7c7b\u578b\u4e3a size_t (\u65e0\u7b26\u53f7)\u3002<\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;ab&#034;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;abcd&#034;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;1&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">else<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;0&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8868\u9762\u770b 2 &#8211; 4 &#061; -2&#xff0c;\u6253\u5370\u7ed3\u679c\u5e94\u4e3a 0&#xff0c;\u4f46\u5b9e\u9645\u6253\u5370\u7ed3\u679c\u4e3a 1\u3002\u56e0\u4e3a\u8be5\u51fd\u6570\u7684\u8fd4\u56de\u503c\u7c7b\u578b\u4e3a size_t \u65e0\u7b26\u53f7&#xff0c;-2\u7684\u8865\u7801\u4f1a\u88ab\u5f53\u505a\u4e00\u4e2a\u975e\u5e38\u5927\u7684\u6b63\u6570\u8f93\u51fa&#xff0c;\u56e0\u6b64\u6253\u5370 1\u3002<\/p>\n<h3>3.strtok\u51fd\u6570<\/h3>\n<p>char* strtok(char*str, const char* sep);<\/p>\n<p>\u56e0\u4e3a\u5b57\u7b26\u4e32\u5185\u5bb9\u4f1a\u88abstrtok\u51fd\u6570\u6539\u53d8&#xff0c;\u5b57\u7b26\u4e32\u4e00\u822c\u90fd\u662f\u526f\u672c \u4e14\u53ef\u4ee5\u4fee\u6539\u3002<\/p>\n<p>char str[] &#061; &#034;abc&#064;cde.qwe&#034;;<br \/>\nchar temp[20] &#061; {0};<br \/>\nstrcpy(temp, str);<\/p>\n<p>sep\u6307\u5411\u4e00\u4e2a\u5b57\u7b26\u4e32&#xff0c;\u8fd9\u4e2a\u5b57\u7b26\u4e32\u662f\u5206\u5272\u7b26&#xff08;\u5b57\u7b26&#xff09;\u7684\u96c6\u5408\u3002 str\u6307\u5411\u7684\u5b57\u7b26\u4e32 \u5305\u542bsep\u6307\u5411\u7684\u5b57\u7b26\u4e32\u4e2d\u7684\u5206\u9694\u7b26&#xff0c;\u8fd9\u4e2a\u5206\u9694\u7b26\u8bb0\u4e3a\u6807\u8bb0\u3002<\/p>\n<p>const char* sep &#061; &#034;&#064;.&#034;;\/\/\u4e24\u4e2a\u5206\u9694\u7b26&#xff08;\u6807\u8bb0&#xff09;&#039;&#064;&#039; \u548c &#039;.&#039;<\/p>\n<p>strtok\u51fd\u6570\u4f1a\u627e\u5230\u8fd9\u4e2a\u6807\u8bb0&#xff0c;\u5c06\u5176\u53d8\u4e3a\u2019\\\\0\u2019&#xff0c;\u5e76\u8fd4\u56de\u6307\u5411\u8fd9\u4e2a\u6807\u8bb0\u7684\u6307\u9488\u3002<\/p>\n<p>char* p &#061; strtok(temp, sep);\/\/\u8fd4\u56de\u7b2c\u4e00\u4e2a\u6807\u8bb0\u7684\u5730\u5740 \u8d4b\u7ed9p<br \/>\np &#061; strtok(NULL,sep);\/\/\u67e5\u627e\u4e0b\u4e00\u4e2a\u6807\u8bb0<\/p>\n<p>\u5982\u679c str !&#061; NULL &#xff0c;\u51fd\u6570\u5c06\u627e\u5230\u5b57\u7b26\u4e32\u7684\u7b2c\u4e00\u4e2a\u6807\u8bb0&#xff0c;\u5e76\u4fdd\u5b58\u5b83\u7684\u4f4d\u7f6e&#xff08;\u5730\u5740&#xff09;\u3002 \u5982\u679c str &#061;&#061; NULL&#xff0c;\u51fd\u6570\u5c06\u4ece\u88ab\u4fdd\u5b58\u7684\u4f4d\u7f6e\u5f00\u59cb&#xff0c;\u67e5\u627e\u4e0b\u4e00\u4e2a\u6807\u8bb0\u3002 \u5982\u679c\u6807\u8bb0\u88ab\u627e\u5b8c&#xff0c;\u8fd4\u56deNULL\u3002<\/p>\n<p>\u4e5f\u53ef\u4ee5\u5982\u4e0b\u7f16\u5199\u7a0b\u5e8f&#xff1a;<\/p>\n<p>char* p &#061; NULL;\/\/\u5b9a\u4e49\u4e00\u4e2a\u6307\u9488\u5e76\u7f6e\u4e8eNULL \u9632\u6b62\u91ce\u6307\u9488\u51fa\u73b0<br \/>\nfor(p &#061; strtok(temp, sep); p!&#061;NULL; p &#061; strtok(NULL, sep))<br \/>\n{<br \/>\n    printf(&#034;%s &#034;,p);\/\/\u6253\u5370\u7ed3\u679c<br \/>\n}<br \/>\n\/\/&#034;abc\\\\0cde\\\\0qwe&#034;<\/p>\n<p>strtok\u51fd\u6570\u4ece\u88ab\u4fdd\u5b58\u4f4d\u7f6e\u5f00\u59cb\u627e\u4e0b\u4e00\u4e2a\u6807\u8bb0&#xff0c;\u8fd0\u7528\u4e86static\u3002<\/p>\n<h3>4.strerror\u51fd\u6570<\/h3>\n<p>\u5728C\u8bed\u8a00\u4e2d&#xff0c;\u5e93\u51fd\u6570\u8c03\u7528\u5931\u8d25\u4f1a\u8bb0\u5f55\u9519\u8bef\u7801&#xff0c;\u9519\u8bef\u7801\u5b58\u653e\u5728\u5168\u5c40\u53d8\u91cferrno\u4e2d\u3002 \u5728\u5934\u6587\u4ef6 errno.h \u4e2d\u6709\u8bf4\u660e\u3002<\/p>\n<p>char* strerror(int errnum);<\/p>\n<p>\u51fd\u6570\u53ef\u4ee5\u628a\u53c2\u6570\u90e8\u5206\u9519\u8bef\u7801 \u5bf9\u5e94\u7684\u5b57\u7b26\u4e32\u4fe1\u606f\u7684\u5730\u5740\u8fd4\u56de\u6765\u3002 \u6bcf\u4e00\u4e2a\u6570\u5b57&#xff08;\u9519\u8bef\u7801&#xff09;\u5bf9\u5e94\u4e86\u4e00\u6761\u9519\u8bef\u4fe1\u606f&#xff0c;\u8fd9\u4e2a\u4fe1\u606f\u4e5f\u662f\u5b57\u7b26\u4e32&#xff0c;\u5177\u6709\u5730\u5740\u3002<\/p>\n<p>\u6ca1\u6709\u9519\u8bef\u65f6 errno\u4e3a 0&#xff0c;\u6709\u9519\u8bef\u65f6 errno\u5b58\u653e\u9519\u8bef\u76f8\u5173\u7684\u9519\u8bef\u7801&#xff0c; \u4f7f\u7528strerror\u51fd\u6570\u5c06\u5177\u4f53\u7684\u9519\u8bef\u4fe1\u606f\u5730\u5740\u5e26\u56de \u7528printf\u51fd\u6570\u6253\u5370\u5c55\u73b0\u3002<\/p>\n<p>char* p &#061; strerror(1);<br \/>\nprintf(&#034;%s&#034;, p);<\/p>\n<p>perror(&#034;hello&#034;);\/\/ hello: &#8230;(\u9519\u8bef\u4fe1\u606f)<\/p>\n<p>perror \u76f8\u5f53\u4e8e printf &#043; strerror&#xff0c;\u81ea\u5b9a\u4e49\u4fe1\u606f&#xff1a;xxxxx(\u9519\u8bef\u4fe1\u606f)\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u76ee\u5f55\u4e00.\u4e00\u4e2a\u53c2\u6570\u7684\u5b57\u7b26\u51fd\u65701.\u5b57\u7b26\u5206\u7c7b\u51fd\u65702.\u5b57\u7b26\u8f6c\u6362\u51fd\u6570\u4e8c.\u4e24\u4e2a\u53c2\u6570 \u957f\u5ea6\u4e0d\u53d7\u9650\u7684\u5b57\u7b26\u4e32\u51fd\u65701.strcpy\u51fd\u65702.strcat\u51fd\u65703.strcmp\u51fd\u6570\u4e09.\u4e09\u4e2a\u53c2\u6570 \u957f\u5ea6\u53d7\u9650\u7684\u5b57\u7b26\u4e32\u51fd\u65701.strncpy\u51fd\u65702.strncat\u51fd\u65703.strncmp\u51fd\u6570\u56db.\u5176\u4ed6\u5b57\u7b26\u4e32\u51fd\u65701.strstr\u51fd\u65702.strlen\u51fd\u65703.strtok\u51fd\u65704.strerror\u51fd\u6570\u4e00.\u4e00\u4e2a\u53c2\u6570\u7684\u5b57\u7b26\u51fd\u6570<br \/>\n1.\u5b57\u7b26\u5206\u7c7b\u51fd\u6570<br \/>\n\u7528\u4e8e\u5224\u65ad\u5b57\u7b26\u7684\u7c7b\u578b&#xff0c;\u4e13\u95e8\u7528\u4e8e\u5b57\u7b26\u5206\u7c7b\u3002 \u9700\u5305\u542b\u5934\u6587\u4ef6 ctpye<\/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":[174],"topic":[],"class_list":["post-111273","post","type-post","status-publish","format-standard","hentry","category-server","tag-c"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5e38\u7528\u7684\u5b57\u7b26\u51fd\u6570\u548c\u5b57\u7b26\u4e32\u51fd\u6570 - \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\/111273.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5e38\u7528\u7684\u5b57\u7b26\u51fd\u6570\u548c\u5b57\u7b26\u4e32\u51fd\u6570 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u76ee\u5f55\u4e00.\u4e00\u4e2a\u53c2\u6570\u7684\u5b57\u7b26\u51fd\u65701.\u5b57\u7b26\u5206\u7c7b\u51fd\u65702.\u5b57\u7b26\u8f6c\u6362\u51fd\u6570\u4e8c.\u4e24\u4e2a\u53c2\u6570 \u957f\u5ea6\u4e0d\u53d7\u9650\u7684\u5b57\u7b26\u4e32\u51fd\u65701.strcpy\u51fd\u65702.strcat\u51fd\u65703.strcmp\u51fd\u6570\u4e09.\u4e09\u4e2a\u53c2\u6570 \u957f\u5ea6\u53d7\u9650\u7684\u5b57\u7b26\u4e32\u51fd\u65701.strncpy\u51fd\u65702.strncat\u51fd\u65703.strncmp\u51fd\u6570\u56db.\u5176\u4ed6\u5b57\u7b26\u4e32\u51fd\u65701.strstr\u51fd\u65702.strlen\u51fd\u65703.strtok\u51fd\u65704.strerror\u51fd\u6570\u4e00.\u4e00\u4e2a\u53c2\u6570\u7684\u5b57\u7b26\u51fd\u6570 1.\u5b57\u7b26\u5206\u7c7b\u51fd\u6570 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