{"id":8349,"date":"2022-05-16T12:20:00","date_gmt":"2022-05-16T03:20:00","guid":{"rendered":"https:\/\/taki-lab.site\/bocci\/?p=8349"},"modified":"2022-05-14T12:23:10","modified_gmt":"2022-05-14T03:23:10","slug":"rust%e5%8b%89%e5%bc%b7%e4%b8%ad%e3%80%815-14%e3%81%ae%e7%a9%8d%e3%81%bf%e4%b8%8a%e3%81%92","status":"publish","type":"post","link":"https:\/\/taki-lab.site\/bocci\/?p=8349","title":{"rendered":"RUST\u52c9\u5f37\u4e2d\u30015\/14\u306e\u7a4d\u307f\u4e0a\u3052"},"content":{"rendered":"\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-\u81ea\u5206\u3001\u307c\u3063\u3061\u3067\u3059\u304c\u4f55\u304b\uff1f wp-block-embed-\u81ea\u5206\u3001\u307c\u3063\u3061\u3067\u3059\u304c\u4f55\u304b\uff1f\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"SGv2L0slkU\"><a href=\"https:\/\/taki-lab.site\/bocci\/?p=8280\">RUST\u52c9\u5f37\u4e2d\u30015\/4\u306e\u7a4d\u307f\u4e0a\u3052<\/a><\/blockquote><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" title=\"&#8220;RUST\u52c9\u5f37\u4e2d\u30015\/4\u306e\u7a4d\u307f\u4e0a\u3052&#8221; &#8212; \u81ea\u5206\u3001\u307c\u3063\u3061\u3067\u3059\u304c\u4f55\u304b\uff1f\" src=\"https:\/\/taki-lab.site\/bocci\/?p=8280&#038;embed=true#?secret=ttpDLBUZH1#?secret=SGv2L0slkU\" data-secret=\"SGv2L0slkU\" width=\"474\" height=\"267\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<p>\u30a8\u30e9\u30fc\u306e\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306e\u52c9\u5f37\u3002<\/p>\n\n\n\n<p>\u307e\u305a\u306f\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3057\u306a\u3044\u5834\u5408\u306e\u30b3\u30fc\u30c9\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>fn get_int_from_file() -> i32 {\r\n    let path = \"number.txt\";\r\n\r\n    let num_str = std::fs::read_to_string(path).expect(\"failed to open the file.\");\r\n    let ret = num_str\r\n        .trim()\r\n        .parse::&lt;i32>()\r\n        .expect(\"failed to parse string to a number.\");\r\n\r\n    ret * 2\r\n}\r\n\r\nfn main() {\r\n    println!(\"{}\", get_int_from_file());\r\n}\r\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>taki@DESKTOP-4VF3GEO:~\/rust\/samplecli$ echo 42 > number.txt\ntaki@DESKTOP-4VF3GEO:~\/rust\/samplecli$ cargo run --bin err_panic\r\n   Compiling samplecli v0.1.0 (\/home\/taki\/rust\/samplecli)\r\n    Finished dev &#91;unoptimized + debuginfo] target(s) in 0.38s\r\n     Running `target\/debug\/err_panic`\r\n84\r\ntaki@DESKTOP-4VF3GEO:~\/rust\/samplecli$ echo hoge > number.txt\r\ntaki@DESKTOP-4VF3GEO:~\/rust\/samplecli$ cargo run --bin err_panic\r\n    Finished dev &#91;unoptimized + debuginfo] target(s) in 0.01s\r\n     Running `target\/debug\/err_panic`\r\nthread 'main' panicked at 'failed to parse string to a number.: ParseIntError { kind: InvalidDigit }', src\/bin\/err_panic.rs:8:10\r\nnote: run with `RUST_BACKTRACE=1` environment variable to display a backtrace\r\ntaki@DESKTOP-4VF3GEO:~\/rust\/samplecli$ <\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u30a8\u30e9\u30fc\u306e\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306e\u52c9\u5f37\u3002 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