{"id":79,"date":"2026-09-13T15:47:40","date_gmt":"2026-09-13T07:47:40","guid":{"rendered":"https:\/\/decagrammaton.xyz\/?p=79"},"modified":"2026-09-17T15:50:15","modified_gmt":"2026-09-17T07:50:15","slug":"07-c%e8%af%ad%e8%a8%80%e5%ad%97%e7%ac%a6%e4%b8%b2","status":"publish","type":"post","link":"https:\/\/decagrammaton.xyz\/?p=79","title":{"rendered":"07-C\u8bed\u8a00\u5b57\u7b26\u4e32"},"content":{"rendered":"\n
\n\n\n\n

\u5b9a\u4e49\u548c\u7531\u6765<\/h1>\n\n\n\n

C \u8bed\u8a00\u6ca1\u6709\u72ec\u7acb\u7684 string \u5b57\u7b26\u4e32\u7c7b\u578b\u3002C \u8bed\u8a00\u4e2d\u7684\u5b57\u7b26\u4e32\u901a\u5e38\u4f7f\u7528\u4ee5 \u2018\\0\u2019\n\u7ed3\u5c3e\u7684 char \u6570\u7ec4\u8868\u793a\u3002<\/p>\n\n\n\n

\n\n\n\n

\u4f7f\u7528\u4f8b:<\/p>\n\n\n\n

<\/a>char<\/span> a[]={<\/span>'A'<\/span>,<\/span>'B'<\/span>,<\/span>'C'<\/span>,<\/span>'D'<\/span>,<\/span>'<\/span>\\0<\/span>'<\/span>};<\/span><\/span>\n<\/a>char<\/span> b[]={<\/span>\"hello\"<\/span>};<\/span>\/\/\u4e24\u4e2a\u90fd\u662fc\u7684\u5408\u6cd5\u5199\u6cd5\uff0c\u662f\u9010\u4e2a\u8f93\u5165\u548c\u5168\u90e8\u8f93\u51652\u79cd\u5199\u6cd5,b\u7c7b\u578b\u7f16\u8bd1\u5668\u4f1a\u81ea\u5df1\u52a0\u5165\"\\0\"<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u5b57\u7b26\u4e32\u7684\u64cd\u4f5c<\/h1>\n\n\n\n
\u5b57\u7b26\u4e32\u7684\u64cd\u4f5c<\/h2>\n\n\n\n
C \u8bed\u8a00\u63d0\u4f9b\u4e86 <string.h><\/code>\n\u5934\u6587\u4ef6\uff0c\u7528\u4e8e\u8fdb\u884c\u5e38\u89c1\u7684\u5b57\u7b26\u4e32\u64cd\u4f5c\u3002<\/p>\n\n\n\n
\u4f7f\u7528\u524d\u9700\u8981\uff1a<\/p>\n\n\n\n
<\/a>#include <\/span><string.h><\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u5e38\u7528\u5b57\u7b26\u4e32\u51fd\u6570<\/h3>\n\n\n\n
\u51fd\u6570<\/th>\u4f5c\u7528<\/th><\/tr><\/thead>
strlen()<\/code><\/td>\u83b7\u53d6\u5b57\u7b26\u4e32\u957f\u5ea6<\/td><\/tr>
strcpy()<\/code><\/td>\u590d\u5236\u5b57\u7b26\u4e32<\/td><\/tr>
strcat()<\/code><\/td>\u8fde\u63a5\u4e24\u4e2a\u5b57\u7b26\u4e32<\/td><\/tr>
strcmp()<\/code><\/td>\u6bd4\u8f83\u4e24\u4e2a\u5b57\u7b26\u4e32<\/td><\/tr>
strchr()<\/code><\/td>\u67e5\u627e\u5b57\u7b26\u7b2c\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e<\/td><\/tr>
strstr()<\/code><\/td>\u67e5\u627e\u5b57\u7b26\u4e32\u7b2c\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
strlen()<\/code> \u2014\u2014\n\u83b7\u53d6\u5b57\u7b26\u4e32\u957f\u5ea6<\/h3>\n\n\n\n
<\/a>char<\/span> a[]<\/span> =<\/span> \"Hello\"<\/span>;<\/span><\/span>\n<\/a><\/span>\n<\/a>printf(<\/span>\"<\/span>%zu\\n<\/span>\"<\/span>,<\/span> strlen(<\/span>a));<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u8f93\u51fa\uff1a<\/p>\n\n\n\n
5<\/code><\/pre>\n\n\n\n
strlen()<\/code> \u4f1a\u4ece\u5b57\u7b26\u4e32\u5f00\u5934\u5f00\u59cb\u8ba1\u7b97\u5b57\u7b26\u6570\u91cf\uff0c\u76f4\u5230\u9047\u5230\n'\\0'<\/code> \u4e3a\u6b62\u3002<\/p>\n\n\n\n
\n
\u6ce8\u610f\uff1a'\\0'<\/code> \u4e0d\u8ba1\u7b97\u5728\u5b57\u7b26\u4e32\u957f\u5ea6\u4e2d\u3002<\/p>\n<\/blockquote>\n\n\n\n
\n\n\n\n
strcpy()<\/code> \u2014\u2014 \u590d\u5236\u5b57\u7b26\u4e32<\/h3>\n\n\n\n
<\/a>char<\/span> a[<\/span>20<\/span>];<\/span><\/span>\n<\/a>char<\/span> b[]<\/span> =<\/span> \"Hello\"<\/span>;<\/span><\/span>\n<\/a><\/span>\n<\/a>strcpy(<\/span>a,<\/span> b);<\/span><\/span>\n<\/a><\/span>\n<\/a>printf(<\/span>\"<\/span>%s\\n<\/span>\"<\/span>,<\/span> a);<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u6267\u884c\u540e\uff1a<\/p>\n\n\n\n
a = \"Hello\"<\/code><\/pre>\n\n\n\n
\u4e5f\u5c31\u662f\uff1a<\/p>\n\n\n\n
strcpy(\u76ee\u6807, \u6e90)<\/code><\/pre>\n\n\n\n
\n\n\n\n
strcat()<\/code> \u2014\u2014 \u8fde\u63a5\u5b57\u7b26\u4e32<\/h3>\n\n\n\n
<\/a>char<\/span> a[<\/span>20<\/span>]<\/span> =<\/span> \"Hello \"<\/span>;<\/span><\/span>\n<\/a>char<\/span> b[]<\/span> =<\/span> \"World\"<\/span>;<\/span><\/span>\n<\/a><\/span>\n<\/a>strcat(<\/span>a,<\/span> b);<\/span><\/span>\n<\/a><\/span>\n<\/a>printf(<\/span>\"<\/span>%s\\n<\/span>\"<\/span>,<\/span> a);<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u8f93\u51fa\uff1a<\/p>\n\n\n\n
Hello World<\/code><\/pre>\n\n\n\n
\u4e5f\u5c31\u662f\u628a b<\/code> \u8fde\u63a5\u5230 a<\/code> \u7684\u672b\u5c3e\uff1a<\/p>\n\n\n\n
a = \"Hello \" + \"World\"\n  = \"Hello World\"<\/code><\/pre>\n\n\n\n
\n
\u6ce8\u610f\uff1a\u76ee\u6807\u6570\u7ec4\u5fc5\u987b\u6709\u8db3\u591f\u7684\u7a7a\u95f4\u5b58\u653e\u8fde\u63a5\u540e\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<\/blockquote>\n\n\n\n
\n\n\n\n
strcmp()<\/code> \u2014\u2014 \u6bd4\u8f83\u5b57\u7b26\u4e32<\/h3>\n\n\n\n
<\/a>char<\/span> a[]<\/span> =<\/span> \"Hello\"<\/span>;<\/span><\/span>\n<\/a>char<\/span> b[]<\/span> =<\/span> \"Hello\"<\/span>;<\/span><\/span>\n<\/a><\/span>\n<\/a>printf(<\/span>\"<\/span>%d\\n<\/span>\"<\/span>,<\/span> strcmp(<\/span>a,<\/span> b));<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u5982\u679c\u4e24\u4e2a\u5b57\u7b26\u4e32\u5b8c\u5168\u76f8\u540c\uff1a<\/p>\n\n\n\n
0<\/code><\/pre>\n\n\n\n
strcmp()<\/code> \u7684\u8fd4\u56de\u503c\uff1a<\/p>\n\n\n\n
0     \u2192 \u4e24\u4e2a\u5b57\u7b26\u4e32\u76f8\u540c\n< 0   \u2192 s1 \u5c0f\u4e8e s2\n> 0   \u2192 s1 \u5927\u4e8e s2<\/code><\/pre>\n\n\n\n
\u6bd4\u8f83\u7684\u662f\u5b57\u7b26\u4e32\u7684\u5b57\u7b26\u987a\u5e8f\uff0c\u800c\u4e0d\u662f\u5b57\u7b26\u4e32\u957f\u5ea6\u3002<\/p>\n\n\n\n
\n\n\n\n
strchr()<\/code> \u2014\u2014 \u67e5\u627e\u5b57\u7b26<\/h3>\n\n\n\n
<\/a>char<\/span> a[]<\/span> =<\/span> \"Hello\"<\/span>;<\/span><\/span>\n<\/a><\/span>\n<\/a>char<\/span> *<\/span>p =<\/span> strchr(<\/span>a,<\/span> 'l'<\/span>);<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
strchr()<\/code>\n\u4f1a\u8fd4\u56de\u4e00\u4e2a\u6307\u9488\uff0c\u6307\u5411\u5b57\u7b26\u4e32\u4e2d\u7b2c\u4e00\u6b21\u51fa\u73b0\u8be5\u5b57\u7b26\u7684\u4f4d\u7f6e<\/strong>\u3002<\/p>\n\n\n\n
\u4f8b\u5982\uff1a<\/p>\n\n\n\n
Hello\n  \u2191\n  \u7b2c\u4e00\u6b21\u51fa\u73b0 'l'<\/code><\/pre>\n\n\n\n
\n\n\n\n
strstr()<\/code> \u2014\u2014 \u67e5\u627e\u5b57\u7b26\u4e32<\/h3>\n\n\n\n
<\/a>char<\/span> a[]<\/span> =<\/span> \"Hello World\"<\/span>;<\/span><\/span>\n<\/a><\/span>\n<\/a>char<\/span> *<\/span>p =<\/span> strstr(<\/span>a,<\/span> \"World\"<\/span>);<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
strstr()<\/code>\n\u4f1a\u8fd4\u56de\u4e00\u4e2a\u6307\u9488\uff0c\u6307\u5411\u5b57\u7b26\u4e32\u4e2d\u7b2c\u4e00\u6b21\u51fa\u73b0\u76ee\u6807\u5b57\u7b26\u4e32\u7684\u4f4d\u7f6e<\/strong>\u3002<\/p>\n\n\n\n
Hello World\n      \u2191\n    World<\/code><\/pre>\n\n\n\n
\n\n\n\n
\u5c0f\u7ed3<\/h2>\n\n\n\n
\u6700\u5e38\u7528\u7684\u51e0\u4e2a\u5b57\u7b26\u4e32\u51fd\u6570\uff1a<\/p>\n\n\n\n
strlen()  \u2192 \u83b7\u53d6\u957f\u5ea6\nstrcpy()  \u2192 \u590d\u5236\nstrcat()  \u2192 \u8fde\u63a5\nstrcmp()  \u2192 \u6bd4\u8f83\nstrchr()  \u2192 \u67e5\u627e\u5b57\u7b26\nstrstr()  \u2192 \u67e5\u627e\u5b57\u7b26\u4e32<\/code><\/pre>\n\n\n\n
\u8fd9\u4e9b\u51fd\u6570\u90fd\u6765\u81ea\uff1a<\/p>\n\n\n\n
<\/a>#include <\/span><string.h><\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\n
\u6ce8\u610f\uff0c\u5b57\u7b26\u4e32\u7ed3\u5c3e\u7684 \u2018\\0\u2019 \u4e0d\u4f1a\u88ab strlen() \u8ba1\u7b97\u3002<\/p>\n<\/div>\n\n\n\n
\u4f7f\u7528\u4f8b:<\/p>\n\n\n\n
<\/a>#include <\/span><stdio.h><\/span><\/span>\n<\/a>#include <\/span><string.h><\/span><\/span>\n<\/a> <\/span>\n<\/a>int<\/span> main ()<\/span><\/span>\n<\/a>{<\/span><\/span>\n<\/a>   char<\/span> str1[<\/span>14<\/span>]<\/span> =<\/span> \"hello,\"<\/span>;<\/span><\/span>\n<\/a>   char<\/span> str2[<\/span>14<\/span>]<\/span> =<\/span> \"world\"<\/span>;<\/span><\/span>\n<\/a>   char<\/span> str3[<\/span>14<\/span>];<\/span><\/span>\n<\/a>   int<\/span>  len ;<\/span><\/span>\n<\/a> <\/span>\n<\/a>   \/* \u590d\u5236 str1 \u5230 str3 *\/<\/span><\/span>\n<\/a>   strcpy(<\/span>str3,<\/span> str1);<\/span><\/span>\n<\/a>   printf(<\/span>\"strcpy( str3, str1) :  <\/span>%s\\n<\/span>\"<\/span>,<\/span> str3 );<\/span><\/span>\n<\/a> <\/span>\n<\/a>   \/* \u8fde\u63a5 str1 \u548c str2 *\/<\/span><\/span>\n<\/a>   strcat(<\/span> str1,<\/span> str2);<\/span><\/span>\n<\/a>   printf(<\/span>\"strcat( str1, str2):   <\/span>%s\\n<\/span>\"<\/span>,<\/span> str1 );<\/span><\/span>\n<\/a> <\/span>\n<\/a>   \/* \u8fde\u63a5\u540e\uff0cstr1 \u7684\u603b\u957f\u5ea6 *\/<\/span><\/span>\n<\/a>   len =<\/span> strlen(<\/span>str1);<\/span><\/span>\n<\/a>   printf(<\/span>\"strlen(str1) :  <\/span>%d\\n<\/span>\"<\/span>,<\/span> len );<\/span><\/span>\n<\/a> <\/span>\n<\/a>   return<\/span> 0<\/span>;<\/span><\/span>\n<\/a>}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u8fd0\u884c\u7ed3\u679c<\/p>\n\n\n\n
<\/a>strcpy(<\/span> str3,<\/span> str1)<\/span> :<\/span>  hello,<\/span><\/span>\n<\/a>strcat(<\/span> str1,<\/span> str2):<\/span>   hello,<\/span>world<\/span>\n<\/a>strlen(<\/span>str1)<\/span> :<\/span>  11<\/span><\/span><\/code><\/pre><\/div>\n","protected":false},"excerpt":{"rendered":"
\u5b9a\u4e49\u548c\u7531\u6765 C \u8bed\u8a00\u6ca1\u6709\u72ec\u7acb\u7684 string \u5b57\u7b26\u4e32\u7c7b\u578b\u3002C \u8bed\u8a00\u4e2d\u7684\u5b57\u7b26\u4e32\u901a\u5e38\u4f7f\u7528\u4ee5 \u2018\\0\u2019 \u7ed3\u5c3e\u7684 char \u6570\u7ec4\u8868\u793a\u3002 \u4f7f …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-79","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/decagrammaton.xyz\/index.php?rest_route=\/wp\/v2\/posts\/79","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/decagrammaton.xyz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/decagrammaton.xyz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/decagrammaton.xyz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/decagrammaton.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=79"}],"version-history":[{"count":2,"href":"https:\/\/decagrammaton.xyz\/index.php?rest_route=\/wp\/v2\/posts\/79\/revisions"}],"predecessor-version":[{"id":81,"href":"https:\/\/decagrammaton.xyz\/index.php?rest_route=\/wp\/v2\/posts\/79\/revisions\/81"}],"wp:attachment":[{"href":"https:\/\/decagrammaton.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=79"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/decagrammaton.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=79"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/decagrammaton.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=79"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}