{"id":21044,"date":"2023-04-07T08:25:43","date_gmt":"2023-04-07T00:25:43","guid":{"rendered":"https:\/\/www.linuxmi.com\/?p=21044"},"modified":"2023-04-06T18:43:31","modified_gmt":"2023-04-06T10:43:31","slug":"rust-tutorial-2-variables","status":"publish","type":"post","link":"https:\/\/www.linuxmi.com\/rust-tutorial-2-variables.html","title":{"rendered":"Rust \u5165\u95e8\u6559\u7a0b#2\uff1a\u5728 Rust \u7a0b\u5e8f\u4e2d\u4f7f\u7528\u53d8\u91cf"},"content":{"rendered":"

\u5728\u672c\u7cfb\u5217\u7684\u7b2c\u4e00\u7ae0\u4e2d\uff0c\u6211\u5206\u4eab\u4e86\u4e3a\u4ec0\u4e48 Rust \u7f16\u7a0b\u8bed\u8a00\u8d8a\u6765\u8d8a\u53d7\u6b22\u8fce\u7684\u60f3\u6cd5\uff0c\u5e76\u5c55\u793a\u4e86\u5982\u4f55\u5728 Rust \u4e2d\u7f16\u5199 Hello World \u7a0b\u5e8f\u3002<\/p>\n

\u8ba9\u6211\u4eec\u7ee7\u7eed\u8fd9\u4e2a Rust \u4e4b\u65c5\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5c06\u5411\u60a8\u4ecb\u7ecd Rust \u7f16\u7a0b\u8bed\u8a00\u4e2d\u7684\u53d8\u91cf\u3002<\/p>\n

Rust\u53d8\u91cf\u7684\u72ec\u7279\u6027 <\/strong><\/h2>\n
\u5728\u7f16\u7a0b\u8bed\u8a00\uff08\u6bd4\u5982Rust\uff09\u4e2d\uff0c\u53d8\u91cf\u662f\u6307\u67d0\u4e9b\u6570\u636e\u5b58\u50a8\u7684\u5185\u5b58\u5730\u5740\u7684\u522b\u540d\u3002<\/p>\n
\u8fd9\u4e5f\u9002\u7528\u4e8eRust\u7f16\u7a0b\u8bed\u8a00\u3002\u4f46Rust\u6709\u4e00\u4e2a\u72ec\u7279\u7684\u201c\u7279\u6027\u201d\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u4f60\u58f0\u660e\u7684\u6bcf\u4e2a\u53d8\u91cf\u90fd\u662f\u4e0d\u53ef\u53d8\u7684\u3002\u8fd9\u610f\u5473\u7740\u4e00\u65e6\u5c06\u503c\u8d4b\u7ed9\u53d8\u91cf\uff0c\u5b83\u5c31\u65e0\u6cd5\u66f4\u6539\u3002<\/p>\n
\u8fd9\u4e2a\u51b3\u5b9a\u662f\u4e3a\u4e86\u786e\u4fdd\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u60a8\u4e0d\u5fc5\u50cf\u81ea\u65cb\u9501\u6216\u4e92\u65a5\u9501\u8fd9\u6837\u505a\u7279\u6b8a\u5904\u7406\u6765\u5f15\u5165\u591a\u7ebf\u7a0b\u3002Rust\u4fdd\u8bc1\u4e86\u5b89\u5168\u7684\u5e76\u53d1\u6027\u3002\u7531\u4e8e\u6240\u6709\u53d8\u91cf\uff08\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff09\u90fd\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u56e0\u6b64\u4f60\u4e0d\u5fc5\u62c5\u5fc3\u4e00\u4e2a\u7ebf\u7a0b\u4f1a\u65e0\u610f\u4e2d\u66f4\u6539\u4e00\u4e2a\u503c\u3002<\/p>\n
\u8fd9\u5e76\u4e0d\u662f\u8bf4Rust\u4e2d\u7684\u53d8\u91cf\u50cf\u5e38\u91cf\u4e00\u6837\uff0c\u56e0\u4e3a\u5b83\u4eec\u4e0d\u662f\u3002\u53d8\u91cf\u53ef\u4ee5\u663e\u5f0f\u5b9a\u4e49\u4e3a\u53ef\u53d8\u7684\u3002\u8fd9\u6837\u7684\u53d8\u91cf\u79f0\u4e3a\u53ef\u53d8\u53d8\u91cf\u3002<\/p>\n
\u4ee5\u4e0b\u662f\u5728Rust\u4e2d\u58f0\u660e\u53d8\u91cf\u7684\u8bed\u6cd5\uff1a<\/p>\n
\/\/ \u9ed8\u8ba4\u4e0d\u53d8\u6027\r\n\/\/ \u521d\u59cb\u5316\u503c\u662f**\u552f\u4e00**\u503c\r\nlet variable_name = value;\r\n\r\n\/\/ \u4f7f\u7528\u201cmut\u201d\u5173\u952e\u5b57\u5b9a\u4e49\u7684\u53ef\u53d8\u53d8\u91cf\r\n\/\/ \u521d\u59cb\u503c\u53ef\u4ee5\u66f4\u6539\u4e3a\u5176\u4ed6\u503c\r\nlet mut variable_name = value;<\/code><\/pre>\n\u867d\u7136\u60a8\u53ef\u4ee5\u66f4\u6539\u53ef\u53d8\u53d8\u91cf\u7684\u503c\uff0c\u4f46\u4e0d\u80fd\u5c06\u53e6\u4e00\u79cd\u6570\u636e\u7c7b\u578b\u7684\u503c\u5206\u914d\u7ed9\u5b83\u3002<\/em><\/p>\n \u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u60a8\u6709\u4e00\u4e2a\u6d6e\u70b9\u578b\u7684\u53ef\u53d8\u53d8\u91cf\uff0c\u60a8\u4e0d\u80fd\u5728\u4ee5\u540e\u5c06\u4e00\u4e2a\u5b57\u7b26\u5206\u914d\u7ed9\u5b83\u3002<\/em><\/p>\n Rust\u7684\u6570\u636e\u7c7b\u578b\u6982\u8ff0<\/strong><\/h2>\n\u5728\u4e0a\u4e00\u7bc7\u6587\u7ae0\u4e2d\uff0c\u4f60\u53ef\u80fd\u5df2\u7ecf\u6ce8\u610f\u5230\u6211\u63d0\u5230\u4e86 Rust \u662f\u4e00\u79cd\u5f3a\u7c7b\u578b\u8bed\u8a00\u3002\u4f46\u662f\u5728\u5b9a\u4e49\u53d8\u91cf\u65f6\uff0c\u4f60\u4e0d\u9700\u8981\u6307\u5b9a\u6570\u636e\u7c7b\u578b\uff0c\u800c\u662f\u4f7f\u7528\u4e00\u4e2a\u901a\u7528\u7684\u5173\u952e\u8bcd let\u3002<\/p>\n Rust\u7f16\u8bd1\u5668\u53ef\u4ee5\u6839\u636e\u8d4b\u7ed9\u53d8\u91cf\u7684\u503c\u63a8\u65ad\u51fa\u6570\u636e\u7c7b\u578b\u3002\u4f46\u662f\uff0c\u5982\u679c\u4f60\u4ecd\u7136\u5e0c\u671b\u663e\u5f0f\u5730\u6307\u5b9a\u6570\u636e\u7c7b\u578b\u5e76\u8fdb\u884c\u7c7b\u578b\u6ce8\u91ca\uff0c\u4e5f\u662f\u53ef\u4ee5\u7684\u3002\u4ee5\u4e0b\u662f\u8bed\u6cd5\uff1a<\/p>\n let variable_name: data_type = value;<\/code><\/pre>\nRust\u7f16\u7a0b\u8bed\u8a00\u4e2d\u4e00\u4e9b\u5e38\u89c1\u7684\u6570\u636e\u7c7b\u578b\u5982\u4e0b\uff1a<\/p>\n \n\u6574\u6570\u7c7b\u578b\uff1ai32 \u548c u32 \u5206\u522b\u7528\u4e8e\u6709\u7b26\u53f7\u548c\u65e0\u7b26\u53f7 32 \u4f4d\u6574\u6570<\/li>\n \u6d6e\u70b9\u7c7b\u578b\uff1af32 \u548c f64\uff0c\u5206\u522b\u4e3a 32 \u4f4d\u548c 64 \u4f4d\u6d6e\u70b9\u6570<\/li>\n \u5e03\u5c14\u7c7b\u578b\uff1abool<\/li>\n \u5b57\u7b26\u7c7b\u578b\uff1achar<\/li>\n<\/ul>\n\u6211\u5c06\u5728\u4e0b\u4e00\u7bc7\u6587\u7ae0\u4e2d\u8be6\u7ec6\u4ecb\u7ecd Rust \u7684\u6570\u636e\u7c7b\u578b\u3002\u76ee\u524d\uff0c\u8fd9\u5e94\u8be5\u8db3\u591f\u4e86\u3002<\/p>\n \ud83d\udea7 Rust\u4e0d\u652f\u6301\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\u3002\u56e0\u6b64\uff0c\u5982\u679c\u4f60\u5c06\u503c8\u8d4b\u7ed9\u4e00\u4e2a\u6d6e\u70b9\u6570\u6570\u636e\u7c7b\u578b\u7684\u53d8\u91cf\uff0c\u4f60\u5c06\u4f1a\u9047\u5230\u7f16\u8bd1\u65f6\u9519\u8bef\u3002\u76f8\u53cd\uff0c\u4f60\u5e94\u8be5\u8d4b\u503c 8. \u6216 8.0\u3002<\/p>\n Rust\u8fd8\u8981\u6c42\u5728\u8bfb\u53d6\u5b58\u50a8\u5728\u53d8\u91cf\u4e2d\u7684\u503c\u4e4b\u524d\uff0c\u53d8\u91cf\u5fc5\u987b\u5148\u521d\u59cb\u5316\u3002<\/p>\n { \/\/ \u8fd9\u4e2a\u5757\u4e0d\u4f1a\u7f16\u8bd1\r\n let a;\r\n println!(\"{}\", a); \/\/ \u5728\u8fd9\u4e00\u884c\u4e0a\u51fa\u73b0\u4e86\u9519\u8bef\r\n \/\/ \u8bfb\u53d6\u672a\u521d\u59cb\u5316\u53d8\u91cf\u7684\u503c\u662f\u4e00\u4e2a\u7f16\u8bd1\u65f6\u9519\u8bef\r\n}\r\n\r\n{ \/\/ \u8fd9\u4e2a\u4ee3\u7801\u5757\u53ef\u4ee5\u7f16\u8bd1\r\n let a;\r\n a = 128;\r\n println!(\"{}\", a); \/\/ \u8fd9\u91cc\u6ca1\u6709\u9519\u8bef\r\n \/\/ \u53d8\u91cf'a'\u6709\u4e00\u4e2a\u521d\u59cb\u503c\r\n}<\/code><\/pre>\n\u5982\u679c\u4f60\u58f0\u660e\u4e86\u4e00\u4e2a\u53d8\u91cf\u4f46\u6ca1\u6709\u521d\u59cb\u5316\u5b83\uff0c\u5728\u7ed9\u5b83\u8d4b\u503c\u4e4b\u524d\u5c31\u4f7f\u7528\u5b83\u7684\u8bdd\uff0cRust\u7f16\u8bd1\u5668\u4f1a\u629b\u51fa\u7f16\u8bd1\u65f6\u9519\u8bef\u3002<\/p>\n \u5c3d\u7ba1\u9519\u8bef\u4ee4\u4eba\u8ba8\u538c\uff0c\u4f46\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cRust\u7f16\u8bd1\u5668\u5f3a\u5236\u4f60\u4e0d\u8981\u72af\u5199\u4ee3\u7801\u65f6\u5e38\u89c1\u7684\u9519\u8bef\u4e4b\u4e00\uff1a\u672a\u521d\u59cb\u5316\u53d8\u91cf\u3002<\/p>\n Rust\u7f16\u8bd1\u5668\u7684\u9519\u8bef\u6d88\u606f <\/strong><\/h2>\n\u8ba9\u6211\u4eec\u7f16\u5199\u4e00\u4e9b\u7a0b\u5e8f<\/p>\n \n\u4e86\u89e3\u5982\u4f55\u901a\u8fc7\u6267\u884c\u201c\u5e38\u89c4\u201d\u4efb\u52a1\u6765\u7406\u89e3Rust\u7684\u8bbe\u8ba1\uff0c\u8fd9\u4e9b\u4efb\u52a1\u5b9e\u9645\u4e0a\u662f\u4e0e\u5185\u5b58\u76f8\u5173\u95ee\u9898\u7684\u4e3b\u8981\u539f\u56e0<\/li>\n \u9605\u8bfb\u548c\u7406\u89e3Rust\u7f16\u8bd1\u5668\u7684\u9519\u8bef\/\u8b66\u544a\u6d88\u606f<\/li>\n<\/ol>\n\u6d4b\u8bd5\u53d8\u91cf\u4e0d\u53ef\u53d8\u6027 <\/strong><\/p>\n \u6211\u4eec\u6545\u610f\u7f16\u5199\u4e00\u4e2a\u8bd5\u56fe\u4fee\u6539\u53ef\u53d8\u53d8\u91cf\u7684\u7a0b\u5e8f\uff0c\u5e76\u67e5\u770b\u63a5\u4e0b\u6765\u4f1a\u53d1\u751f\u4ec0\u4e48\u3002<\/p>\n fn main() {\r\n let mut a = 172;\r\n let b = 273;\r\n println!(\"a: {a}, b: {b}\");\r\n\r\n a = 380;\r\n b = 420;\r\n println!(\"a: {}, b: {}\", a, b);\r\n}\r\n\/\/ \u66f4\u591a\u8be6\u7ec6\u6559\u7a0b www.linuxmi.com\r\n\/\/ \u66f4\u591a\u8be6\u7ec6\u6559\u7a0bLinux\u8ff7 www.linuxmi.com<\/code><\/pre>\n\u7a0b\u5e8f\u770b\u8d77\u6765\u5f88\u7b80\u5355\uff0c\u76f4\u5230\u7b2c 4 \u884c\u3002\u4f46\u662f\u5728\u7b2c 7 \u884c\uff0c\u4e00\u4e2a\u4e0d\u53ef\u53d8\u53d8\u91cf b \u88ab\u4fee\u6539\u4e86\u5b83\u7684\u503c\u3002<\/p>\n \u8bf7\u6ce8\u610f Rust \u4e2d\u6253\u5370\u53d8\u91cf\u503c\u7684\u4e24\u79cd\u65b9\u6cd5\u3002\u5728\u7b2c 4 \u884c\uff0c\u6211\u7528\u82b1\u62ec\u53f7\u5c06\u53d8\u91cf\u62ec\u8d77\u6765\uff0c\u4ee5\u4fbf\u5b83\u4eec\u7684\u503c\u5c06\u88ab\u6253\u5370\u3002\u5728\u7b2c 8 \u884c\uff0c\u6211\u4fdd\u7559\u82b1\u62ec\u53f7\u4e3a\u7a7a\uff0c\u5e76\u5c06\u53d8\u91cf\u4f5c\u4e3a\u53c2\u6570\u63d0\u4f9b\uff0c\u50cf C \u8bed\u8a00\u98ce\u683c\u3002\u8fd9\u4e24\u79cd\u65b9\u6cd5\u90fd\u662f\u6709\u6548\u7684\u3002\uff08\u9664\u4e86\u4fee\u6539\u4e0d\u53ef\u53d8\u53d8\u91cf\u7684\u503c\uff0c\u8fd9\u4e2a\u7a0b\u5e8f\u7684\u4e00\u5207\u90fd\u662f\u6b63\u786e\u7684\u3002\uff09<\/p>\n \u8ba9\u6211\u4eec\u8fdb\u884c\u7f16\u8bd1\uff01\uff08\u5982\u4e0b\u56fe\uff09\u5982\u679c\u60a8\u6309\u7167\u4e0a\u4e00\u7ae0\u7684\u8bf4\u660e\u505a\u4e86\uff0c\u60a8\u5df2\u7ecf\u77e5\u9053\u5982\u4f55\u7f16\u8bd1\u4e86\u3002<\/p>\n <\/p>\n \ud83d\udccb\u201cbinding\u201d\u4e00\u8bcd\u6307\u7684\u662f\u53d8\u91cf\u540d\uff0c\u4f46\u8fd9\u53ea\u662f\u4e00\u4e2a\u7b80\u5355\u5316\u7684\u89e3\u91ca\u3002<\/em><\/p>\n \u8fd9\u4e2a\u4f8b\u5b50\u975e\u5e38\u597d\u5730\u5c55\u793a\u4e86 Rust \u5f3a\u5927\u7684\u9519\u8bef\u68c0\u67e5\u548c\u4fe1\u606f\u53cd\u9988\u529f\u80fd\u3002\u7b2c\u4e00\u884c\u5217\u51fa\u4e86\u5bfc\u81f4\u4e0a\u8ff0\u4ee3\u7801\u65e0\u6cd5\u7f16\u8bd1\u7684\u9519\u8bef\u4fe1\u606f\uff1a<\/p>\n error[E0384]: cannot assign twice to immutable variable b<\/code><\/pre>\n\u8fd9\u610f\u5473\u7740 Rust \u7f16\u8bd1\u5668\u6ce8\u610f\u5230\u6211\u8bd5\u56fe\u5c06\u4e00\u4e2a\u65b0\u503c\u8d4b\u7ed9\u53d8\u91cf b\uff0c\u4f46\u662f\u53d8\u91cf b \u662f\u4e00\u4e2a\u4e0d\u53ef\u53d8\u53d8\u91cf\uff0c\u6240\u4ee5\u4f1a\u5bfc\u81f4\u8fd9\u4e2a\u9519\u8bef\u3002<\/p>\n \u7f16\u8bd1\u5668\u751a\u81f3\u6807\u51fa\u4e86\u9519\u8bef\u51fa\u73b0\u7684\u786e\u5207\u884c\u548c\u5217\u53f7\u3002<\/p>\n \u5728\u63d0\u793a\u4fe1\u606f\u7684\u4e0b\u4e00\u884c\uff0c\u8bf4\u7684\u662f\u201c\u7b2c\u4e00\u6b21\u4e3a b<\/code> \u8d4b\u503c\u7684\u884c\u201d\uff0c\u5e76\u63d0\u4f9b\u4e86\u5e2e\u52a9\u3002\u7531\u4e8e\u6211\u6b63\u5728\u4fee\u6539\u4e0d\u53ef\u53d8\u53d8\u91cf b \u7684\u503c\uff0c\u56e0\u6b64\u88ab\u544a\u77e5\u8981\u4f7f\u7528 mut \u5173\u952e\u5b57\u5c06\u53d8\u91cf b \u58f0\u660e\u4e3a\u53ef\u53d8\u53d8\u91cf\u3002<\/p>\n \ud83d\udda5\ufe0f \u81ea\u5df1\u5b9e\u73b0\u4e00\u4e2a\u4fee\u590d\u65b9\u6848\uff0c\u66f4\u597d\u5730\u7406\u89e3\u624b\u5934\u7684\u95ee\u9898\u3002<\/em><\/p>\n \u4f7f\u7528\u672a\u521d\u59cb\u5316\u7684\u53d8\u91cf<\/h2>\n\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u770b\u4e00\u4e0b\u5f53\u8bfb\u53d6\u672a\u521d\u59cb\u5316\u53d8\u91cf\u7684\u503c\u65f6Rust\u7f16\u8bd1\u5668\u4f1a\u53d1\u751f\u4ec0\u4e48\u3002<\/p>\n fn main() {\r\n let a: i32;\r\n a = 123;\r\n println!(\"a: {a}\");\r\n\r\n let b: i32;\r\n println!(\"b: {b}\");\r\n b = 123;\r\n}\r\n\/\/ \u66f4\u591a\u8be6\u7ec6\u6559\u7a0b www.linuxmi.com\r\n\/\/ \u66f4\u591a\u8be6\u7ec6\u6559\u7a0bLinux\u8ff7 www.linuxmi.com<\/code><\/pre>\n\u5728\u8fd9\u91cc\uff0c\u6211\u58f0\u660e\u4e86\u4e24\u4e2a\u4e0d\u53ef\u53d8\u53d8\u91cfa\u548cb\uff0c\u4e24\u8005\u90fd\u672a\u521d\u59cb\u5316\u3002\u5728\u8bfb\u53d6\u53d8\u91cfa\u7684\u503c\u4e4b\u524d\uff0c\u5c06\u53d8\u91cfa\u8d4b\u503c\u3002\u4f46\u662f\u5728\u7ed9\u53d8\u91cfb\u8d4b\u521d\u59cb\u503c\u4e4b\u524d\uff0c\u5df2\u7ecf\u8bfb\u53d6\u4e86\u53d8\u91cfb\u7684\u503c\u3002<\/p>\n \u8ba9\u6211\u4eec\u7f16\u8bd1\u5e76\u67e5\u770b\u7ed3\u679c\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n <\/p>\n \u5728\u8fd9\u91cc\uff0cRust \u7f16\u8bd1\u5668\u4f1a\u629b\u51fa\u4e00\u4e2a\u7f16\u8bd1\u65f6\u9519\u8bef\u548c\u4e00\u4e2a\u8b66\u544a\u3002\u8b66\u544a\u6307\u51fa\u53d8\u91cf b \u7684\u503c\u4ece\u672a\u88ab\u8bfb\u53d6\u8fc7\u3002<\/p>\n \u4f46\u8fd9\u662f\u8352\u8c2c\u7684\uff01\u53d8\u91cf b \u7684\u503c\u5728\u7b2c 7 \u884c\u88ab\u8bbf\u95ee\u4e86\u3002\u4f46\u662f\u8bf7\u4ed4\u7ec6\u770b\uff0c\u8b66\u544a\u662f\u9488\u5bf9\u7b2c 8 \u884c\u7684\u3002\u8fd9\u5f88\u4ee4\u4eba\u56f0\u60d1\uff1b\u8ba9\u6211\u4eec\u6682\u65f6\u8df3\u8fc7\u8fd9\u4e2a\u8b66\u544a\uff0c\u770b\u770b\u9519\u8bef\u4fe1\u606f\u3002<\/p>\n \u9519\u8bef\u6d88\u606f\u663e\u793a used binding b<\/code> is possibly-uninitialized\u3002\u4e0e\u524d\u9762\u7684\u4f8b\u5b50\u4e00\u6837\uff0cRust \u7f16\u8bd1\u5668\u6307\u51fa\u8bfb\u53d6\u53d8\u91cf b \u7684\u503c\u662f\u9519\u8bef\u7684\uff0c\u539f\u56e0\u662f\u5176\u503c\u672a\u521d\u59cb\u5316\uff0c\u5728Rust\u7f16\u7a0b\u8bed\u8a00\u4e2d\u662f\u4e0d\u5408\u6cd5\u7684\uff0c\u56e0\u6b64\u4f1a\u51fa\u73b0\u7f16\u8bd1\u65f6\u9519\u8bef\u3002<\/p>\n \ud83d\udda5\ufe0f \u901a\u8fc7\u4ea4\u6362\u7b2c7\u884c\u548c\u7b2c8\u884c\u7684\u4ee3\u7801\uff0c\u53ef\u4ee5\u8f7b\u677e\u89e3\u51b3\u6b64\u9519\u8bef\u3002\u5c1d\u8bd5\u4e00\u4e0b\uff0c\u770b\u770b\u9519\u8bef\u662f\u5426\u6d88\u5931\u3002\u5982\u4e0b\u56fe\uff1a<\/em><\/p>\n <\/p>\n \u793a\u4f8b\u7a0b\u5e8f\uff1a\u4ea4\u6362\u6570\u5b57<\/h2>\n\u73b0\u5728\u4f60\u5df2\u7ecf\u719f\u6089\u4e86\u5e38\u89c1\u7684\u4e0e\u53d8\u91cf\u76f8\u5173\u7684\u95ee\u9898\uff0c\u8ba9\u6211\u4eec\u770b\u4e00\u4e2a\u4ea4\u6362\u4e24\u4e2a\u53d8\u91cf\u7684\u503c\u7684\u7a0b\u5e8f\u3002<\/p>\n fn main() {\r\n let mut a = 7186932;\r\n let mut b = 1276561;\r\n\r\n println!(\"a: {a}, b: {b}\");\r\n\r\n \/\/ \u4ea4\u6362\u503c\r\n let temp = a;\r\n a = b;\r\n b = temp;\r\n\r\n println!(\"a: {}, b: {}\", a, b);\r\n}\r\n\/\/ \u66f4\u591a\u8be6\u7ec6\u6559\u7a0b www.linuxmi.com\r\n\/\/ \u66f4\u591a\u8be6\u7ec6\u6559\u7a0bLinux\u8ff7 www.linuxmi.com<\/code><\/pre>\n\u8fd9\u91cc\uff0c\u6211\u58f0\u660e\u4e86\u4e24\u4e2a\u53d8\u91cfa\u548cb\u3002\u4e24\u4e2a\u53d8\u91cf\u90fd\u662f\u53ef\u53d8\u7684\uff0c\u56e0\u4e3a\u6211\u5e0c\u671b\u5728\u4ee5\u540e\u6539\u53d8\u5b83\u4eec\u7684\u503c\u3002\u6211\u5206\u914d\u4e86\u4e00\u4e9b\u968f\u673a\u7684\u503c\u3002\u6700\u521d\uff0c\u6211\u6253\u5370\u8fd9\u4e9b\u53d8\u91cf\u7684\u503c\u3002<\/p>\n \u7136\u540e\uff0c\u5728\u7b2c8\u884c\uff0c\u6211\u521b\u5efa\u4e86\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7684\u53d8\u91cftemp\uff0c\u5e76\u5c06\u5b58\u50a8\u5728a\u4e2d\u7684\u503c\u8d4b\u7ed9\u5b83\u3002\u4e4b\u6240\u4ee5\u8fd9\u4e2a\u53d8\u91cf\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u662f\u56e0\u4e3atemp\u7684\u503c\u4e0d\u4f1a\u6539\u53d8\u3002<\/p>\n \u4e3a\u4e86\u4ea4\u6362\u503c\uff0c\u6211\u5c06\u53d8\u91cfb\u7684\u503c\u8d4b\u7ed9\u53d8\u91cfa\uff0c\u7136\u540e\u5728\u4e0b\u4e00\u884c\u5c06temp\u7684\u503c\uff08\u5b83\u5305\u542ba\u7684\u503c\uff09\u8d4b\u7ed9\u53d8\u91cfb\u3002\u73b0\u5728\u503c\u5df2\u7ecf\u4ea4\u6362\uff0c\u6211\u6253\u5370\u53d8\u91cfa\u548cb\u7684\u503c\u3002<\/p>\n \u5f53\u7f16\u8bd1\u5e76\u6267\u884c\u4ee5\u4e0a\u4ee3\u7801\u65f6\uff0c\u6211\u5f97\u5230\u4ee5\u4e0b\u8f93\u51fa\uff1a<\/p>\n <\/p>\n \u5982\u60a8\u6240\u89c1\uff0c\u503c\u5df2\u7ecf\u4ea4\u6362\u4e86\uff0c\u5b8c\u7f8e\u3002<\/p>\n \u4f7f\u7528\u4f46\u5c1a\u672a\u4f7f\u7528\u7684\u53d8\u91cf<\/strong><\/h2>\n\u5728\u7f16\u8bd1 Rust \u4ee3\u7801\u65f6\uff0c\u5982\u679c\u60a8\u5df2\u7ecf\u58f0\u660e\u4e86\u4e00\u4e9b\u6253\u7b97\u5728\u4e0b\u4e00\u6b65\u4e2d\u4f7f\u7528\u4f46\u5c1a\u672a\u4f7f\u7528\u7684\u53d8\u91cf\uff0c\u5219 Rust \u7f16\u8bd1\u5668\u4f1a\u5bf9\u6b64\u53d1\u51fa\u8b66\u544a\u3002<\/p>\n \u539f\u56e0\u5f88\u660e\u663e\u3002\u672a\u4f7f\u7528\u7684\u53d8\u91cf\u5360\u7528\u4e0d\u5fc5\u8981\u7684\u521d\u59cb\u5316\u65f6\u95f4\uff08CPU \u5468\u671f\uff09\u548c\u5185\u5b58\u7a7a\u95f4\u3002\u5982\u679c\u4e0d\u4f1a\u4f7f\u7528\u5b83\uff0c\u4e3a\u4ec0\u4e48\u8981\u5728\u7a0b\u5e8f\u4e2d\u4f7f\u7528\u5b83\u5462\uff1f\u5c3d\u7ba1\u7f16\u8bd1\u5668\u4f1a\u5bf9\u5176\u8fdb\u884c\u4f18\u5316\uff0c\u4f46\u5b83\u4ecd\u7136\u5b58\u5728\u4ee3\u7801\u5197\u4f59\u7684\u53ef\u8bfb\u6027\u95ee\u9898\u3002<\/p>\n \u4f46\u6709\u65f6\uff0c\u60a8\u53ef\u80fd\u4f1a\u9047\u5230\u65e0\u6cd5\u521b\u5efa\u53d8\u91cf\u7684\u60c5\u51b5\u3002\u4f8b\u5982\uff0c\u5f53\u4e00\u4e2a\u51fd\u6570\u8fd4\u56de\u591a\u4e2a\u503c\uff0c\u800c\u60a8\u53ea\u9700\u8981\u5176\u4e2d\u7684\u4e00\u4e9b\u503c\u65f6\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u60a8\u65e0\u6cd5\u544a\u8bc9\u5e93\u7ef4\u62a4\u8005\u6839\u636e\u60a8\u7684\u9700\u6c42\u8c03\u6574\u5176\u51fd\u6570\u3002<\/p>\n \u56e0\u6b64\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u5212\u7ebf\u5f00\u5934\u7684\u53d8\u91cf\uff0cRust \u7f16\u8bd1\u5668\u5c06\u4e0d\u518d\u7ed9\u60a8\u63d0\u4f9b\u6b64\u7c7b\u8b66\u544a\u3002\u5982\u679c\u60a8\u786e\u5b9e\u4e0d\u9700\u8981\u751a\u81f3\u4f7f\u7528\u5b58\u50a8\u5728\u672a\u4f7f\u7528\u53d8\u91cf\u4e2d\u7684\u503c\uff0c\u53ef\u4ee5\u5c06\u5176\u7b80\u5355\u5730\u547d\u540d\u4e3a _\uff08\u4e0b\u5212\u7ebf\uff09\uff0cRust \u7f16\u8bd1\u5668\u4e5f\u5c06\u5ffd\u7565\u5b83\uff01<\/p>\n \u4ee5\u4e0b\u7a0b\u5e8f\u4e0d\u4ec5\u4e0d\u4f1a\u751f\u6210\u4efb\u4f55\u8f93\u51fa\uff0c\u800c\u4e14\u4e5f\u4e0d\u4f1a\u751f\u6210\u4efb\u4f55\u8b66\u544a\u548c\/\u6216\u9519\u8bef\u6d88\u606f\uff1a<\/p>\n fn main() {\r\n let _unnecessary_var = 0; \/\/ \u6ca1\u6709\u8b66\u544a\u4fe1\u606f\r\n let _ = 0.0; \/\/ \u5b8c\u5168\u88ab\u5ffd\u7565\r\n}<\/code><\/pre>\n\u7b97\u672f\u8fd0\u7b97<\/h2>\n\u7531\u4e8e\u6570\u5b66\u5c31\u662f\u6570\u5b66\uff0cRust \u5e76\u6ca1\u6709\u5728\u6570\u5b66\u65b9\u9762\u8fdb\u884c\u521b\u65b0\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528\u6240\u6709\u53ef\u80fd\u5728\u5176\u4ed6\u7f16\u7a0b\u8bed\u8a00\u4e2d\u4f7f\u7528\u8fc7\u7684\u7b97\u672f\u8fd0\u7b97\u7b26\uff0c\u5982 C\u3001C++ \u6216 Java\u3002<\/p>\n \u53ef\u4ee5\u5728\u6b64\u5904<\/a>\u627e\u5230 Rust \u7f16\u7a0b\u8bed\u8a00\u4e2d\u6240\u6709\u64cd\u4f5c\u7684\u5b8c\u6574\u5217\u8868\uff0c\u4ee5\u53ca\u5b83\u4eec\u7684\u542b\u4e49\u3002<\/p>\n \u793a\u4f8b\u7a0b\u5e8f\uff1aRusty \u6e29\u5ea6\u8ba1<\/strong><\/h2>\n\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5178\u578b\u7684\u7a0b\u5e8f\uff0c\u5c06\u534e\u6c0f\u6e29\u5ea6\u8f6c\u6362\u4e3a\u6444\u6c0f\u6e29\u5ea6\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002<\/p>\nfn main() {\r\n let boiling_water_f: f64 = 212.0;\r\n let frozen_water_c: f64 = 0.0;\r\n\r\n let boiling_water_c = (boiling_water_f - 32.0) * (5.0 \/ 9.0);\r\n let frozen_water_f = (frozen_water_c * (9.0 \/ 5.0)) + 32.0;\r\n\r\n println!(\r\n \"\u6c34\u5728\u6cb8\u817e\u65f6\u7684\u6e29\u5ea6\u4e3a {}\u00b0C (\u6216 {}\u00b0F).\",\r\n boiling_water_c, boiling_water_f\r\n );\r\n println!(\r\n \"\u6c34\u5728\u7ed3\u51b0\u65f6\u7684\u6e29\u5ea6\u4e3a {}\u00b0C (\u6216 {}\u00b0F).\",\r\n frozen_water_c, frozen_water_f\r\n );\r\n}\r\n\/\/ \u66f4\u591a\u8be6\u7ec6\u6559\u7a0b www.linuxmi.com\r\n\/\/ \u66f4\u591a\u8be6\u7ec6\u6559\u7a0bLinux\u8ff7 www.linuxmi.com<\/code><\/pre>\n\u8fd9\u91cc\u5e76\u6ca1\u6709\u4ec0\u4e48\u590d\u6742\u7684\u5185\u5bb9…\u8fd9\u4e2a\u7a0b\u5e8f\u5c06\u534e\u6c0f\u6e29\u5ea6\u8f6c\u6362\u4e3a\u6444\u6c0f\u6e29\u5ea6\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002<\/p>\n <\/p>\n \u6b63\u5982\u60a8\u5728\u8fd9\u91cc\u770b\u5230\u7684\uff0c\u7531\u4e8e Rust \u4e0d\u5141\u8bb8\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362\uff0c\u6211\u4e0d\u5f97\u4e0d\u5728 32\u30019 \u548c 5 \u8fd9\u4e9b\u6574\u6570\u540e\u9762\u52a0\u4e0a\u5c0f\u6570\u70b9\u3002\u9664\u6b64\u4e4b\u5916\uff0c\u8fd9\u4e0e\u60a8\u5728 C\u3001C++ \u6216 Java \u4e2d\u6240\u505a\u7684\u7c7b\u4f3c\u3002<\/p>\n \u4f5c\u4e3a\u4e00\u4e2a\u5b66\u4e60\u7ec3\u4e60\uff0c\u5c1d\u8bd5\u7f16\u5199\u4e00\u4e2a\u7a0b\u5e8f\uff0c\u627e\u51fa\u7ed9\u5b9a\u6570\u5b57\u4e2d\u6709\u591a\u5c11\u4f4d\u6570\u5b57\u3002<\/p>\n\u8bf7\u7ee7\u7eed\u5173\u6ce8<\/strong>\uff1aRust \u5165\u95e8\u6559\u7a0b\u7cfb\u5217<\/strong>\uff1ahttps:\/\/www.linuxmi.com\/tag\/rustjiaocheng<\/a><\/p>\n","protected":false},"excerpt":{"rendered":" \u5728\u672c\u7cfb\u5217\u7684\u7b2c\u4e00\u7ae0\u4e2d\uff0c\u6211\u5206\u4eab\u4e86\u4e3a\u4ec0\u4e48 Rust \u7f16\u7a0b\u8bed\u8a00\u8d8a\u6765\u8d8a\u53d7\u6b22\u8fce\u7684\u60f3\u6cd5\uff0c\u5e76\u5c55\u793a\u4e86\u5982\u4f55\u5728 Rust …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[2],"tags":[1348],"class_list":["post-21044","post","type-post","status-publish","format-standard","hentry","category-zixun","tag-rustjiaocheng"],"aioseo_notices":[],"views":256,"_links":{"self":[{"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/posts\/21044","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/comments?post=21044"}],"version-history":[{"count":10,"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/posts\/21044\/revisions"}],"predecessor-version":[{"id":21066,"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/posts\/21044\/revisions\/21066"}],"wp:attachment":[{"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/media?parent=21044"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/categories?post=21044"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.linuxmi.com\/wp-json\/wp\/v2\/tags?post=21044"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}