comparison

问题 In python 3, int(50)<'2' causes a TypeError , and well it should. In python 2.x, however, int(50)<'2' returns True (this is also the case for other number formats, but int exists in both py2 and py3). My question, then, has several parts: Why does Python 2.x (< 3?) allow this behavior? (And who thought it was a good idea to allow this to begin with???) What does it mean that an int is less than a str ? Is it referring to ord / chr ? Is there some binary format which is less obvious? Is there

问题 I'm trying to determine if two colors are equivalent, using code written in Objective-C. I'm using this snippet of code to determine if the two colors are equivalent (currently for debugging purposes) NSLog(@"currentColor is %@", currentColor); NSLog(@"Adjacent Color is %@",[[buttonArray objectAtIndex:1] backgroundColor]); NSLog(@"%i",[[buttonArray objectAtIndex:1] backgroundColor]==currentColor); My console is showing 2009-10-20 00:27:10.814 colorGame[13588:207] currentColor is

问题 I'm trying to determine if two colors are equivalent, using code written in Objective-C. I'm using this snippet of code to determine if the two colors are equivalent (currently for debugging purposes) NSLog(@"currentColor is %@", currentColor); NSLog(@"Adjacent Color is %@",[[buttonArray objectAtIndex:1] backgroundColor]); NSLog(@"%i",[[buttonArray objectAtIndex:1] backgroundColor]==currentColor); My console is showing 2009-10-20 00:27:10.814 colorGame[13588:207] currentColor is

问题 Give me some of your thoughts on which is a better coding practice/makes more efficient code/looks prettier/whatever: Increasing and improving your ability to use if statements to anticipate and catch potential problems? Or simply making good use of try/catch in general? Let's say this is for Java (if it matters). Edit: I'm presently transitioning myself away from some admittedly out-dated and constrained current coding practices, but I'm a little torn on the necessity of doing so on a few

问题 Given the test code: @Test public void testEnumAreEqual() { for (var someEnum : SomeEnum.values()) { Assertions.assertTrue(EnumUtils.isValidEnum(OtherEnum.class, someEnum.name())); } for (var otherEnum : OtherEnum.values()) { Assertions.assertTrue(EnumUtils.isValidEnum(SomeEnum.class, otherEnum.name())); } } I want to check if two given enums are containing the same values. Is there maybe a more elegant way to do this? 回答1: Build a set of the names: Set<String> someEnumNames = Arrays.stream

问题 This question already has answers here : Reference — What does this symbol mean in PHP? (18 answers) What is the difference between <> and != [duplicate] (7 answers) Closed 6 years ago . What does the following code do? A link to something in the PHP manual would also be nice. if ($_SERVER['SERVER_PORT'] <> 443) { doSomething(); } 回答1: Same as !=, "Not equal" false <> true // operator will evaluate expression as true false != true // operator will evaluate expression as true Here is some

问题 How can I improve this? The relationship is one to one and continuous on [-1,5] so i was thinking of using enum, but I'm not sure how to compare a string value to an enum value. If there is any better way to do this, please suggest. Thanks! private int evaluateWord(String sval) { if (sval.equals("program")) return 1; else if (sval.equals("begin")) return 2; else if (sval.equals("end")) return 3; else if (sval.equals("int")) return 4; else if (sval.equals("if")) return 5; else System.exit(0);

问题 This question already has answers here : Comparing numbers in Bash (8 answers) Closed last year . How can i accomplish number comparison involving negative numbers? if [[ "-2" > "-1" ]]; then echo "-2 >-1" else echo "-2 <=-1" fi I also tried if [ '-2' -lt '-1' ]; then but the condition always behaves as if -2 would be greater than -1. The comparisons work when i do not use negative numbers. I would like a solution in pure bash if possible. 回答1: Seems to work correctly: if [[ "-2" -gt "-1" ]];

问题 Is there any equality predicate function in ImageMagick library? I want to compare two images and find whether they are the exactly same (all colors of the pixels are the same) or have any differences. I’ve looked around, but it seems not to have a such function. Should I write the function using pixel iterators by myself? 回答1: ImageMagick provides the compare function to properly compare images. Checking the md5 checksum of two images is not the correct approach, since some image formats (e

问题 I saw this in the diveintohtml5 website. This is how they check to see if localstorage is supported on the browser. return 'localStorage' in window && window['localStorage'] !== null; Would this be the same as just doing? return window.localStorage != undefined 回答1: 1 return 'localStorage' in window && window['localStorage'] !== null; This returns true if the window object contains a property with the name localStorage and the value of that property is not null . 2 return window.localStorage