integer

问题 In a Going Native 2013 talk, the panel had suggested avoiding unsigned integer types when specifying variables that "can't be negative". 12:15: "Use signed integers unless you need 2's compliment arithmetic or a bit pattern." 12:55: "Use ints until you have a reason not to. Don't use unsigned unless you are fiddling with bit patterns, and never mix signed and unsigned." 42:45: "Whenever you mix signed and unsigned numbers you get trouble. The rules are just very surprising, and they turn up

问题 Hey all, I ran into an interesting occurrence and am looking for an explanation. In Java 1.6: Integer a = new Integer(5); Integer b = new Integer(5); System.out.println(a == b); Integer c = 5; Integer d = 5; System.out.println(c == d); I get: false true In Eclipse I checked in the debugger. a and b are different objects, while c and d are the same objects (but different from a and b ). Can anyone clue me in on what's going on under the hood? Is this JVM magic? Realizing that a Integer(5) is

问题 I'm creating a php script which creates a random number which is 7 digits long and doesn't contain 0's, the only problem with this is that I have to call the function rand 7 times and store every number generated in a different variable, but I was wondering how I could put these numbers together in a variable instead of adding them together something along the lines of $security_number = $1&&$2&&$3 and so on. thanks in advance. 回答1: I think I know what you are trying to achieve. You need the

问题 I use XML output in my app. So basically the main activity just tells the android to show the XML layout of main. But what if I have in the activity code defined integer variable and I want this integer variable also be shown on the display? How do I PUSH the integer variable to the XML??? From main XML reference to other strings in XML is easy - @string/app_name ... but how do I use the integer variable from the activity? 回答1: Presumably you're showing some text in a TextView . You can

问题 I have some logic within a function that takes a string of numbers called digits like so: 6145390195186705543 I then attempt to convert with parseInt() like so: parseInt(digits) The result of: digits = parseInt(digits); is 6145390195186705000 Can someone help me understand why this is the case? and how i can get an accurate conversion? 回答1: This is another version of "broken" floating point math: Javascript uses 64 bits to store numbers as small as the size of an atom up to the number of

问题 Using the following macro: #define MIN_SWORD (signed int) 0x8000 In e.g. the following expression: signed long s32; if (s32 < (signed long)MIN_SWORD)... is expected to do the following check: if (s32 < -32768) One some compilers it seems to work fine. But on some other compiler the exprssion is evaluated as: if (s32 < 32768) My question: How is a ANSI-C compiler supposed to evaluate the following expression: (signed long) (signed int) 0x8000 ? It seems that on some compilers the cast to `

问题 everyone! I hope someone can help me figure out something in C language. This is my first seriously homework in IT, I have no experience and I'm learning in e-studies, so teacher help isn't very available. I need to develop console application in C language. User need to input 10 integer numbers, if insert number isn't integer, need to output error and again re-enter new number until all 10 integer numbers will be inserted. Everything works in case if I say that these 10 numbers can't be 0 (I

问题 I'm trying to set the images of some ImageButtons in my layout programmatically. To do so, I named my ImageButtons ic_1 to ic_5. During my initialization method, I want to loop through these 5 ImageButtons and set their images according to a list of possible icons. Basically users can change the order in which the icons should be shown, which in turn would change the image on the ImageButtons. However, i can't seem to reference the buttons since they have an Integer in their ID. The code I

问题 I´ve made a program that does the (usually called) hailstone sequence, The program basically does this: creates an int (value) and assign it a value. If the int is even, divide it by two. If the int is odd, multiply it by three and add one. Continue this process until n is equal to one. it seems to be working fine with most numbers, but this number 99888769, the app hangs on a negative integer. Why is this?, they say that no-one has yet been able to proove that it stops, I´m not expecting I

问题 Working in Python, given a list of N sets of integers from the range range(s,n), how can I build a list that groups all these integers according to their set memberships? An example is really going to help me explain here: Example input (N=2 sets): integerRange = range(0,13) input = [set([0,1,2,3,7,8,9,12]), set([0,1,2,3,4,5,6,12])] Desired output: out = [set([10,11]), set([4,5,6]), set([7,8,9]), set([0,1,2,3,12])] So in the output each integer in range(s,n) appears exactly once, and there