{"id":501,"date":"2008-12-14T15:47:58","date_gmt":"2008-12-14T07:47:58","guid":{"rendered":"http:\/\/www.slyar.com\/blog\/?p=501"},"modified":"2014-04-22T13:49:07","modified_gmt":"2014-04-22T05:49:07","slug":"c-null-nul","status":"publish","type":"post","link":"http:\/\/www.slyar.com\/blog\/c-null-nul.html","title":{"rendered":"C\u8bed\u8a00\u4e2d NULL\u548cNUL\u7684\u533a\u522b"},"content":{"rendered":"<p>\u6587\u7ae0\u4f5c\u8005\uff1a<span style=\"color: #0000ff;\">\u59dc\u5357(Slyar) <\/span>\u6587\u7ae0\u6765\u6e90\uff1aSlyar Home (<a title=\"Slyar\" href=\"http:\/\/www.slyar.com\" target=\"_blank\">www.slyar.com<\/a>) \u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff0c\u8c22\u8c22\u5408\u4f5c\u3002<\/p>\n<p>\u300aC\u4e13\u5bb6\u7f16\u7a0b\u300b\u91cc\u9762\u63d0\u5230\u4e86\"The One 'l' nul and the Two 'l' null\"\uff0c\u7f51\u4e0a\u67e5\u4e86\u4e00\u4e0b\uff0c\u5f97\u5230\u4e86\u4e00\u4e2a\u66f4\u8be6\u7ec6\u7684\u533a\u5206\u3002<\/p>\n<blockquote><p>NULL is a macro defined in several standard headers, 0 is an integer constant, '\\0' is a character constant, and nul is the name of the character constant. All of these are not interchangeable:<\/p>\n<p>NULL is to be used for pointers only since it may be defined as ((void *)0), this would cause problems with anything but pointers.<\/p>\n<p>0 can be used anywhere, it is the generic symbol for each type's zero value and the compiler will sort things out.<\/p>\n<p>'\\0' should be used only in a character context.<\/p>\n<p>nul is not defined in C or C++, it shouldn't be used unless you define it yourself in a suitable manner, like:<\/p>\n<p>#define nul '\\0'<\/p><\/blockquote>\n<p>\u7ffb\u8bd1\u4e00\u4e0b\u5c31\u662f\uff1a<\/p>\n<p><span style=\"color: #0000ff;\">NULL\u88ab\u5927\u91cf\u5b9a\u4e49\u5728\u6807\u51c6\u5934\u6587\u4ef6\u4e2d\uff0c0\u662f\u4e00\u4e2a\u6574\u578b\u5e38\u91cf\uff0c'\\0'\u662f\u4e00\u4e2a\u5b57\u7b26\u5e38\u91cf\uff0c\u800cNUL\u662f\u4e00\u4e2a\u5b57\u7b26\u5e38\u91cf\u7684\u540d\u5b57\u3002\u8fd9\u51e0\u4e2a\u672f\u8bed\u90fd\u4e0d\u53ef\u4e92\u6362\u3002<\/span><\/p>\n<p><span style=\"color: #0000ff;\">1\u3001NULL\u7528\u4e8e\u8868\u793a\u4ec0\u4e48\u4e5f\u4e0d\u6307\u5411\uff0c\u4e5f\u5c31\u662f\u7a7a\u6307\u9488((void *)0)<\/span><\/p>\n<p><span style=\"color: #0000ff;\">2\u30010\u53ef\u4ee5\u88ab\u7528\u4e8e\u4efb\u4f55\u5730\u65b9\uff0c\u5b83\u662f\u8868\u793a\u5404\u79cd\u7c7b\u578b\u96f6\u503c\u7684\u7b26\u53f7\u5e76\u4e14\u7f16\u8bd1\u5668\u4f1a\u6311\u51fa\u5b83<\/span><\/p>\n<p><span style=\"color: #0000ff;\">3\u3001'\\0'\u5e94\u8be5\u53ea\u88ab\u7528\u4e8e\u7ed3\u675f\u5b57\u7b26\u4e32<\/span><\/p>\n<p><span style=\"color: #0000ff;\">4\u3001NUL\u6ca1\u6709\u88ab\u5b9a\u4e49\u4e8eC\u548cC++\uff0c\u5b83\u4e0d\u5e94\u8be5\u88ab\u4f7f\u7528\u9664\u975e\u4f60\u81ea\u5df1\u5b9a\u4e49\u5b83\uff0c\u50cf\uff1a#define nul '\\0'<\/span><\/p>\n<p>\u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff1a<a href=\"http:\/\/www.slyar.com\/blog\">Slyar Home<\/a> &raquo; <a href=\"http:\/\/www.slyar.com\/blog\/c-null-nul.html\">C\u8bed\u8a00\u4e2d NULL\u548cNUL\u7684\u533a\u522b<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u4f5c\u8005\uff1a\u59dc\u5357(Slyar) \u6587\u7ae0\u6765\u6e90\uff1aSlyar Home (www.slyar.com) \u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff0c\u8c22\u8c22\u5408\u4f5c\u3002 \u300aC\u4e13\u5bb6\u7f16\u7a0b\u300b\u91cc\u9762\u63d0\u5230\u4e86\"The One 'l' nul and the Two 'l' null\"\uff0c\u7f51\u4e0a\u67e5\u4e86\u4e00\u4e0b\uff0c\u5f97\u5230\u4e86\u4e00\u4e2a\u66f4\u8be6\u7ec6 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[899,303,304,907],"class_list":["post-501","post","type-post","status-publish","format-standard","hentry","category-programing","tag-mac","tag-303","tag-304","tag-907"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2.1 - 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