octal

问题 Is 00, 000, or 000... an integer in Java? Or is it an octal? If is it an octal is 001 or 0005 an octal? 回答1: All are integers , but... 1 is decimal 0 is decimal 01 is octal 00 is octal From Java Language Specification (emphasis mine): Note that octal numerals always consist of two or more digits; 0 is always considered to be a decimal numeral - not that it matters much in practice, for the numerals 0, 00, and 0x0 all represent exactly the same integer value. 回答2: Number literal representation

问题 Why is it that following results in 34? It doesn\'t seem to have anything to do with octal numbers. intval(042); 回答1: but a leading 0 does indicate octal in many languages, as is the case here. 回答2: It does have to do with octal numbers, 042 is interpreted as the octal number 42 which is 4 * 8 + 2 = 34 . Please be aware that the octal interpretation happens when the number literal is parsed while loading the PHP script. It has nothing to do with intval() , which doesn't do anything here

问题 This question already has answers here : php array behaving strangely with key value 07 & 08 (5 answers) Is this a bug in PHP? [duplicate] (8 answers) Closed 6 years ago . I have some PHP code with some integers and all works fine, except when I have 08 or 0X as integer. It all works fine when I put them in quote. Example numbers: 2 //Works fine 08 //Doesn\'t work 012 //Doesn\'t work \"08\" //Works fine again \"012\" //Works fine again Can anyone tell me the reason behind it? 回答1: If you

问题 This question already has an answer here: Why is 08 not a valid integer literal in Java? 6 answers I am using quartz for schedulling. TriggerUtils.getDateOf(0,40,18,09,06); it accept 5 parameter. (seconds, minutes, hours, daysOfMonth, month). When i pass fourth parameter as \"09\". Eclipse give me error \"The literal Octal 09 (digit 9) of type int is out of range \". But when i pass the fourth parameter as \"9\" instead of \"09\", it works. Can anyone explain me this error? 回答1: In java, if

问题 Some of you may recognize this as Project Euler\'s problem number 11. The one with the grid. I\'m trying to replicate the grid in a large multidimensional array, But it\'s giving me a syntax error and i\'m not sure why grid = [ [ 08, 02, 22, 97, 38, 15, 00, 40, 00, 75, 04, 05, 07, 78, 52, 12, 50, 77, 91, 08 ], [ 49, 49, 99, 40, 17, 81, 18, 57, 60, 87, 17, 40, 98, 43, 69, 48, 04, 56, 62, 00 ], [ 81, 49, 31, 73, 55, 79, 14, 29, 93, 71, 40, 67, 53, 88, 30, 03, 49, 13, 36, 65 ], ... And I get

问题 Zero is always zero, so it doesn\'t matter. But in a recent discussion with a friend he said that octal literals are almost unused today. † Then it dawned upon me that actually almost all integer literals in my code are octal, namely 0 . Is 0 an octal literal according to the C++ grammar? What does the standard say? † The only real use I\'m aware of is for unix file permissions. 回答1: Yes, 0 is an Octal literal in C++. As per the C++ Standard: 2.14.2 Integer literals [lex.icon] integer-literal

问题 Try executing the following in JavaScript: parseInt(\'01\'); //equals 1 parseInt(\'02\'); //equals 2 parseInt(\'03\'); //equals 3 parseInt(\'04\'); //equals 4 parseInt(\'05\'); //equals 5 parseInt(\'06\'); //equals 6 parseInt(\'07\'); //equals 7 parseInt(\'08\'); //equals 0 !! parseInt(\'09\'); //equals 0 !! I just learned the hard way that JavaScript thinks the leading zero indicates an octal integer, and since there is no \"8\" or \"9\" in base-8, the function returns zero. Like it or not,