{"id":44139,"date":"2022-10-17T18:49:52","date_gmt":"2023-04-28T09:27:08","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8egolang%e7%9a%84goto%e8%af%ad%e5%8f%a5%e3%80%82\/"},"modified":"2024-01-15T11:55:24","modified_gmt":"2024-01-15T03:55:24","slug":"%e5%85%b3%e4%ba%8egolang%e7%9a%84goto%e8%af%ad%e5%8f%a5%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8egolang%e7%9a%84goto%e8%af%ad%e5%8f%a5%e3%80%82\/","title":{"rendered":"\u5173\u4e8eGolang\u7684goto\u8bed\u53e5"},"content":{"rendered":"<h3>\u5bf9Golang\u7684goto\u8bed\u53e5\u611f\u5174\u8da3\u7684\u80cc\u666f\u662f\u4ec0\u4e48\uff1f<\/h3>\n<p>\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\uff0c\u5f53\u6211\u5728\u5b66\u4e60\u7f16\u7801\u6d4b\u8bd5\u65f6\uff0c\u6050\u6127\u5730\u6211\u7b2c\u4e00\u6b21\u542c\u8bf4\u4e86goto\u8bed\u53e5\uff0c\u6240\u4ee5\u6211\u6253\u7b97\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\u603b\u7ed3\u4e00\u4e0b\u3002<\/p>\n<h3>\u5728\u5177\u4f53\u7684\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528goto\u8bed\u53e5\u7684\u4f4d\u7f6e<\/h3>\n<p>\u5b9e\u9645\u4e0a\uff0c\u5982\u679c\u67e5\u770bGolang\u7684Github\uff0c\u4f3c\u4e4e\u5728\u8fd9\u4e2a\u4f4d\u7f6e\u4f7f\u7528\u4e86\u8fd9\u79cd\u65b9\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">r<\/span> <span class=\"o\">*<\/span><span class=\"n\">Rand<\/span><span class=\"p\">)<\/span> <span class=\"n\">Float64<\/span><span class=\"p\">()<\/span> <span class=\"kt\">float64<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"c\">\/\/ A clearer, simpler implementation would be:<\/span>\r\n\t<span class=\"c\">\/\/\treturn float64(r.Int63n(1&lt;&lt;53)) \/ (1&lt;&lt;53)<\/span>\r\n\t<span class=\"c\">\/\/ However, Go 1 shipped with<\/span>\r\n\t<span class=\"c\">\/\/\treturn float64(r.Int63()) \/ (1 &lt;&lt; 63)<\/span>\r\n\t<span class=\"c\">\/\/ and we want to preserve that value stream.<\/span>\r\n\t<span class=\"c\">\/\/<\/span>\r\n\t<span class=\"c\">\/\/ There is one bug in the value stream: r.Int63() may be so close<\/span>\r\n\t<span class=\"c\">\/\/ to 1&lt;&lt;63 that the division rounds up to 1.0, and we've guaranteed<\/span>\r\n\t<span class=\"c\">\/\/ that the result is always less than 1.0.<\/span>\r\n\t<span class=\"c\">\/\/<\/span>\r\n\t<span class=\"c\">\/\/ We tried to fix this by mapping 1.0 back to 0.0, but since float64<\/span>\r\n\t<span class=\"c\">\/\/ values near 0 are much denser than near 1, mapping 1 to 0 caused<\/span>\r\n\t<span class=\"c\">\/\/ a theoretically significant overshoot in the probability of returning 0.<\/span>\r\n\t<span class=\"c\">\/\/ Instead of that, if we round up to 1, just try again.<\/span>\r\n\t<span class=\"c\">\/\/ Getting 1 only happens 1\/2\u2075\u00b3 of the time, so most clients<\/span>\r\n\t<span class=\"c\">\/\/ will not observe it anyway.<\/span>\r\n<span class=\"n\">again<\/span><span class=\"o\">:<\/span>\r\n\t<span class=\"n\">f<\/span> <span class=\"o\">:=<\/span> <span class=\"kt\">float64<\/span><span class=\"p\">(<\/span><span class=\"n\">r<\/span><span class=\"o\">.<\/span><span class=\"n\">Int63<\/span><span class=\"p\">())<\/span> <span class=\"o\">\/<\/span> <span class=\"p\">(<\/span><span class=\"m\">1<\/span> <span class=\"o\">&lt;&lt;<\/span> <span class=\"m\">63<\/span><span class=\"p\">)<\/span>\r\n\t<span class=\"k\">if<\/span> <span class=\"n\">f<\/span> <span class=\"o\">==<\/span> <span class=\"m\">1<\/span> <span class=\"p\">{<\/span>\r\n\t\t<span class=\"k\">goto<\/span> <span class=\"n\">again<\/span> <span class=\"c\">\/\/ resample; this branch is taken O(never)<\/span>\r\n\t<span class=\"p\">}<\/span>\r\n\t<span class=\"k\">return<\/span> <span class=\"n\">f<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u7528\u4e2d\u6587\u5199\u7684\u8bdd\u5927\u6982\u662f\u8fd9\u6837\u7684\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">r<\/span> <span class=\"o\">*<\/span><span class=\"n\">Rand<\/span><span class=\"p\">)<\/span> <span class=\"n\">Float32<\/span><span class=\"p\">()<\/span> <span class=\"kt\">float32<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">f<\/span> <span class=\"o\">:=<\/span> <span class=\"kt\">float32<\/span><span class=\"p\">(<\/span><span class=\"n\">r<\/span><span class=\"o\">.<\/span><span class=\"n\">Float64<\/span><span class=\"p\">())<\/span>\r\n    <span class=\"k\">for<\/span> <span class=\"n\">f<\/span> <span class=\"o\">==<\/span> <span class=\"m\">1<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">f<\/span> <span class=\"o\">=<\/span> <span class=\"kt\">float32<\/span><span class=\"p\">(<\/span><span class=\"n\">r<\/span><span class=\"o\">.<\/span><span class=\"n\">Float64<\/span><span class=\"p\">())<\/span>\r\n    <span class=\"p\">}<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">f<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u6211\u5bf9\u8be5\u7528\u6cd5\u7684\u7406\u89e3\u8fd8\u4e0d\u591f\uff0c\u662f\u5426\u53ef\u4ee5\u7528for\u5faa\u73af\u5462\uff1f\u53e6\u5916\uff0c\u4f7f\u7528goto\u8bed\u53e5\u5728\u65b9\u6cd5\u5916\u4f1a\u5bfc\u81f4\u7f16\u8bd1\u9519\u8bef\u3002\u8fd9\u662fGoPlayground\u7684\u94fe\u63a5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"k\">var<\/span> <span class=\"n\">val<\/span> <span class=\"kt\">int<\/span> <span class=\"o\">=<\/span> <span class=\"m\">0<\/span>\r\n\t<span class=\"n\">val<\/span> <span class=\"o\">=<\/span> <span class=\"n\">val<\/span> <span class=\"o\">+<\/span> <span class=\"m\">2<\/span>\r\n\t<span class=\"k\">if<\/span> <span class=\"n\">val<\/span> <span class=\"o\">&lt;<\/span> <span class=\"m\">5<\/span> <span class=\"p\">{<\/span>\r\n\t\t<span class=\"k\">goto<\/span> <span class=\"n\">XYZ<\/span>\r\n\t<span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">PrintHello<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n<span class=\"n\">XYZ<\/span><span class=\"o\">:<\/span>\r\n\t<span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Printf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"Hello World<\/span><span class=\"se\">\\n<\/span><span class=\"s\">\"<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"c\">\/\/ putput:<\/span>\r\n<span class=\"c\">\/\/ .\/prog.go:9:8: label XYZ not defined<\/span>\r\n<span class=\"c\">\/\/ .\/prog.go:14:1: label XYZ defined and not used<\/span>\r\n\r\n<\/code><\/pre>\n<h3>\u4e2a\u4eba\u7684\u611f\u53d7<\/h3>\n<p>\u55ef\uff0c\u8001\u5b9e\u8bf4\uff0c\u6211\u89c9\u5f97\u7528for\u5faa\u73af\u5e94\u8be5\u53ef\u4ee5\uff0c\u4f46\u5904\u7406\u901f\u5ea6\u7b49\u4f1a\u6709\u5dee\u5f02\u5427\u3002<\/p>\n<p>\u8bf7\u53c2\u8003 https:\/\/qiita.com\/weloan\/items\/29018c8d0049abbe6199<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5bf9Golang\u7684goto\u8bed\u53e5\u611f\u5174\u8da3\u7684\u80cc\u666f\u662f\u4ec0\u4e48\uff1f \u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\uff0c\u5f53\u6211\u5728\u5b66\u4e60\u7f16\u7801\u6d4b\u8bd5\u65f6\uff0c\u6050\u6127\u5730\u6211\u7b2c\u4e00\u6b21\u542c\u8bf4\u4e86go [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-44139","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5173\u4e8eGolang\u7684goto\u8bed\u53e5 - Blog - Silicon Cloud<\/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.silicloud.com\/zh\/blog\/\u5173\u4e8egolang\u7684goto\u8bed\u53e5\u3002\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5173\u4e8eGolang\u7684goto\u8bed\u53e5\" \/>\n<meta property=\"og:description\" content=\"\u5bf9Golang\u7684goto\u8bed\u53e5\u611f\u5174\u8da3\u7684\u80cc\u666f\u662f\u4ec0\u4e48\uff1f \u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\uff0c\u5f53\u6211\u5728\u5b66\u4e60\u7f16\u7801\u6d4b\u8bd5\u65f6\uff0c\u6050\u6127\u5730\u6211\u7b2c\u4e00\u6b21\u542c\u8bf4\u4e86go [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5173\u4e8egolang\u7684goto\u8bed\u53e5\u3002\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-04-28T09:27:08+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-01-15T03:55:24+00:00\" \/>\n<meta name=\"author\" content=\"\u96c5, \u609f\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u96c5, \u609f\" \/>\n\t<meta name=\"twitter:label2\" 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