numbers

问题 when converting javascript floating point numbers to string format insignificant trailing decimal zeros are lost. for an example var num = 20.0; altert(num); will give output as 20 how can i stop removing insignificant decimal trailing zeros when formatted as string 回答1: Answer that was already given Please take above reference 来源： https://stackoverflow.com/questions/31554276/convert-javascript-floating-point-numbers-to-string-without-loosing-insignifican

问题 I have an input field, where user has to add his address, but I need to get at least one number (house number). How should I validate that field ? Thanks in advance for any help. 回答1: Answering the question, to see if a string contains at least one number : if ( string.match(/\d/) ) { // do something } FIDDLE 来源： https://stackoverflow.com/questions/17364013/at-least-one-number-in-input-field-jquery

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: Java problem-Whats the reason behind and what will be probable output long milli=24*60*60*1000; long micro=24*60*60*1000*1000; long result=micro/milli; The result should be 1000 but its not. Why does it work when I use 24*60*60*1000*1000L ? Can someone tell me the reason for this? 回答1: The trouble is that the calculation is done on int s and then casted to long , and unfortunately 24*60*60*1000*1000 won't fit in

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . I can`t figure out the code to get the date from monday depending on the week number of this year. could someone help me with this code? thanks. 回答1: This will provide the Monday of a certain week this year: $thisYear = date('Y'); $weekNum = 40; $date = date('Y-m-d', strtotime("$thisYear-W$weekNum-1")); //

问题 I want to create method thath generate numbering for Database record in the future. My rules like this : [start] - [end] 0001- 9999 A001- A999 AA01- AA99 AB01- AB99 AC01- AC99 etc... ...... ...... ZZZZ Its look similar using Excel column numbering. How to create like that, using Java? Here is my code : But i confuse in how to check if in the last number like 9999 , A999 etc public static void main(String [] args) { String lastSchCode = "9999"; System.out.println(generateSchCode(lastSchCode));

问题 I am trying to solve subsets from the USACO training gateway... Problem Statement For many sets of consecutive integers from 1 through N (1 <= N <= 39), one can partition the set into two sets whose sums are identical. For example, if N=3, one can partition the set {1, 2, 3} in one way so that the sums of both subsets are identical: {3} and {1,2} This counts as a single partitioning (i.e., reversing the order counts as the same partitioning and thus does not increase the count of partitions).

问题 I am trying to create a number guessing game with multiple numbers. The computer generates 4 random numbers between 1 and 9 and then the user has 10 chances to guess the correct numbers. I need the feedback to display as YYYY for 4 correct numbers guessed, YNNY for first and last number guessed etc. (you get the point). the code below keeps coming back saying IndexError: list index out of range . from random import randint guessesTaken = 0 randomNumber = [] for x in range(4): tempNumber =

问题 I want to get a number of a string, and separate the string and the number, and then, do a loop and call a method the number of times the string says. The string has to have this structure: "ABJ3" (Only one number accepted and 3 characters before it) This is my code, but it repeat hundred of times, I don't know why int veces = 0; for (int i = 0; i < m.Length; i++) { if (Char.IsDigit(m[i])) veces = Convert.ToInt32(m[i]); } if (m.Length == 4) { for (int i = 0; i <= veces; i++) { m = m.Substring

问题 i am new to c# and i am trying to generate numbers ifrom normal distribution in c#. I serched the web and i found only some code. I would like to use a ready built in function and not a code!! any suggestions? 回答1: You will still need to do a little coding too: Define your normal distribution. Sample from it. N.B You need to define it once and then sample as opposed to re-define. Maybe this little class can help, then you can just use it in your code where you need... public class

问题 So I have this to convert String from JTextField to int . It says Exception in thread "main" java.lang.NumberFormatException: For input string: "" . Please help. JTextField amountfld = new JTextField(15); gbc.gridx = 1; // Probably not affecting anything gbc.gridy = 3; // add(amountfld, gbc); String amountString = amountfld.getText(); int amount = Integer.parseInt(amountString); 回答1: From docs: Throws: NumberFormatException - if the string does not contain a parsable integer. The empty String