{"topic":{"id":14762,"title":"Floating Point Math: 0.1+0.2=0.30000000000000004","slug":"topic","categoryId":4,"createdAt":"2025-06-12 13:14:10.081498","bumpedAt":"2025-06-12 13:20:11.776246","views":136,"postsCount":1,"highestPostNumber":1,"likeCount":3,"closed":false,"pinned":false,"pinnedGlobally":false,"pinnedAt":null,"pinnedUntil":null,"isBanner":false,"excerpt":"https://0.30000000000000004.com/ liu@S ~ % node Welcome to Node.js v22.14.0. Type \".help\" for more information. > 0.1+0.3 0.4 > 0.1+0.2 0.30000000000000004 liu@S ~ % python Python 3.13.3 (main, Apr 9 2025, 07:44:25…","deletedAt":null,"isAnonymous":false,"category":{"id":4,"name":"谈笑风生","slug":"general","color":"25AAE2"},"author":{"id":4668,"username":"IO","name":null,"avatarUrl":"/uploads/image/86/f2/86f267c0aaa73835a999b7cc3a7e7a701605574eda9a2c2a56f5ddbbba64d1a9.avif"},"tags":[]},"posts":[{"id":56289,"postNumber":1,"raw":"https://0.30000000000000004.com/\n\n```\nliu@S ~ % node\nWelcome to Node.js v22.14.0.\nType \".help\" for more information.\n> 0.1+0.3\n0.4\n> 0.1+0.2\n0.30000000000000004\n\nliu@S ~ % python \nPython 3.13.3 (main, Apr 9 2025, 07:44:25) [GCC 14.2.1 20250207] on linux\nType \"help\", \"copyright\", \"credits\" or \"license\" for more information.\n>>> 0.1+0.3\n0.4\n>>> 0.1+0.2\n0.30000000000000004\n\nliu@S ~ % irb \n3.3.8 :001 > 0.1+0.3\n => 0.4 \n3.3.8 :002 > 0.1+0.2\n => 0.30000000000000004 \n\nliu@S ~ % cat a.rs \nfn main() {\n println!(\"{}\", 0.1+0.2);\n}\n[0 running job(s)] {history#10021} 21:16:39 2025-06-12\nliu@S ~ % rustc a.rs\n[0 running job(s)] {history#10022} 21:17:41 2025-06-12\nliu@S ~ % ./a\n0.30000000000000004\n\nliu@S ~ % cat a.cpp \n#include \nint main() {\n std::cout<<(0.1+0.2);\n}\n[0 running job(s)] {history#10035} 21:19:50 2025-06-12\nliu@S ~ % g++ a.cpp\n[0 running job(s)] {history#10036} 21:19:55 2025-06-12\nliu@S ~ % ./a.out \n0.3% \n```\n\n![image|557x500](/uploads/image/7b/69/7b69359b8a3b5238169e86bd589289b6936ffe849a08f4861b80f454f8abe1f4.avif)","cooked":"

liu@S ~ % node\nWelcome to Node.js v22.14.0.\nType \".help\" for more information.\n> 0.1+0.3\n0.4\n> 0.1+0.2\n0.30000000000000004\n\nliu@S ~ % python         \nPython 3.13.3 (main, Apr  9 2025, 07:44:25) [GCC 14.2.1 20250207] on linux\nType \"help\", \"copyright\", \"credits\" or \"license\" for more information.\n>>> 0.1+0.3\n0.4\n>>> 0.1+0.2\n0.30000000000000004\n\nliu@S ~ % irb \n3.3.8 :001 > 0.1+0.3\n => 0.4 \n3.3.8 :002 > 0.1+0.2\n => 0.30000000000000004 \n\nliu@S ~ % cat a.rs      \nfn main() {\n    println!(\"{}\", 0.1+0.2);\n}\n[0 running job(s)] {history#10021} 21:16:39 2025-06-12\nliu@S ~ % rustc a.rs\n[0 running job(s)] {history#10022} 21:17:41 2025-06-12\nliu@S ~ % ./a\n0.30000000000000004\n\nliu@S ~ % cat a.cpp \n#include <iostream>\nint main() {\n        std::cout<<(0.1+0.2);\n}\n[0 running job(s)] {history#10035} 21:19:50 2025-06-12\nliu@S ~ % g++ a.cpp\n[0 running job(s)] {history#10036} 21:19:55 2025-06-12\nliu@S ~ % ./a.out \n0.3%         \n

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