{"id":807,"date":"2022-07-25T15:33:17","date_gmt":"2022-07-25T15:33:17","guid":{"rendered":"https:\/\/blog.liuyingjie.com.cn\/?p=807"},"modified":"2023-08-13T08:12:50","modified_gmt":"2023-08-13T08:12:50","slug":"kr2-%e7%ac%ac%e4%ba%8c%e7%ab%a0%e6%8f%90%e5%88%b0%e7%b1%bb%e5%9e%8b%e8%bd%ac%e6%8d%a2","status":"publish","type":"post","link":"https:\/\/blog.liuyingjie.com.cn\/?p=807","title":{"rendered":"K&#038;R2 \u7b2c\u4e8c\u7ae0\u63d0\u5230\u7c7b\u578b\u8f6c\u6362\u793a\u4f8b"},"content":{"rendered":"\n<p>\u4f8b\u5982\uff0c\u5047\u8bbe int \u4e3a 16 \u4f4d\uff0clong \u4e3a 32 \u4f4d\u3002 \u7136\u540e -1L &lt; 1U\uff0c\u56e0\u4e3a 1U \u662f\u4e00\u4e2a unsigned int\uff0c\u88ab\u63d0\u5347\u4e3a\u4e00\u4e2a\u6709\u7b26\u53f7\u7684 long\u3002 \u4f46\u662f -1L &gt; 1UL \u56e0\u4e3a -1L \u88ab\u63d0\u5347\u4e3a\u65e0\u7b26\u53f7\u957f\u6574\u6570\uff0c\u56e0\u6b64\u770b\u8d77\u6765\u662f\u4e00\u4e2a\u5f88\u5927\u7684\u6b63\u6570\u3002<\/p>\n\n\n\n<p><strong>-1L &lt; 1U\uff1a<\/strong><\/p>\n\n\n\n<p>-1L \u4f5c\u4e3a 32 \u4f4d\u957f int = \u8868\u793a\u4e3a 0xFFFFFFFF\u3002 \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u4e0d\u4f1a\u88ab\u8f6c\u6362\uff0c\u56e0\u6b64\u89e3\u91ca\u4fdd\u6301 -1<\/p>\n\n\n\n<p>1U \u4f5c\u4e3a 16 \u4f4d\u65e0\u7b26\u53f7\u6574\u6570 = 0x0001\u3002 \u63d0\u5347\u4e3a 32 \u4f4d\u957f int -&gt; 0x00000001 = \u89e3\u91ca\u4e3a 1<\/p>\n\n\n\n<p>\u6bd4\u8f83\u7ed3\u679c\uff1a-1 &lt; 1<\/p>\n\n\n\n<p><strong>-1L &gt; 1UL\uff1a<\/strong><\/p>\n\n\n\n<p>-1L = 32 \u4f4d\u957f\u6574\u6570 = 0xFFFFFFFF\u3002 \u8f6c\u6362\u4e3a unsigned long int = 0xFFFFFFFF\u3002 \u56e0\u4e3a\u5b83\u73b0\u5728\u662f\u65e0\u7b26\u53f7\u7684\uff0c\u6240\u4ee5\u5b83\u4f1a\u88ab\u89e3\u91ca\u4e3a (2^32 &#8211; 1)<\/p>\n\n\n\n<p>1UL \u4f5c\u4e3a 32 \u4f4d\u957f int = \u8868\u793a\u4e3a 0x00000001\u3002 \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u4e0d\u4f1a\u88ab\u8f6c\u6362\uff0c\u6240\u4ee5\u89e3\u91ca\u4fdd\u6301 1<\/p>\n\n\n\n<p>\u6bd4\u8f83\u7ed3\u679c\uff1a(2^32 &#8211; 1) &gt; 1<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f8b\u5982\uff0c\u5047\u8bbe int \u4e3a 16 \u4f4d\uff0clong \u4e3a 32 \u4f4d\u3002 \u7136\u540e -1L &lt; 1U\uff0c\u56e0\u4e3a 1U \u662f\u4e00\u4e2a  &hellip; <a href=\"https:\/\/blog.liuyingjie.com.cn\/?p=807\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">K&#038;R2 \u7b2c\u4e8c\u7ae0\u63d0\u5230\u7c7b\u578b\u8f6c\u6362\u793a\u4f8b<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[8],"tags":[],"class_list":["post-807","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"https:\/\/blog.liuyingjie.com.cn\/index.php?rest_route=\/wp\/v2\/posts\/807","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.liuyingjie.com.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.liuyingjie.com.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.liuyingjie.com.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.liuyingjie.com.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=807"}],"version-history":[{"count":4,"href":"https:\/\/blog.liuyingjie.com.cn\/index.php?rest_route=\/wp\/v2\/posts\/807\/revisions"}],"predecessor-version":[{"id":991,"href":"https:\/\/blog.liuyingjie.com.cn\/index.php?rest_route=\/wp\/v2\/posts\/807\/revisions\/991"}],"wp:attachment":[{"href":"https:\/\/blog.liuyingjie.com.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=807"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.liuyingjie.com.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=807"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.liuyingjie.com.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=807"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}