numbers | 易学教程

Colorize negative/positive numbers (jQuery)

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问题 I'd like to color numbers in a table for better readability: green for positive (+00.00); red for negative (-00.00) and; black for default case (no sign) 回答1: Here ya go: $(document).ready( function() { // the following will select all 'td' elements with class "of_number_to_be_evaluated" // if the TD element has a '-', it will assign a 'red' class, and do the same for green. $("td.of_number_to_be_evaluated:contains('-')").addClass('red'); $("td.of_number_to_be_evaluated:contains('+')")

greatest among three numbers

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public class Solution { public static void main(String[] args) { Scanner ip = new Scanner(System.in); System.out.print("Enter A: "); int a = ip.nextInt(); System.out.print("Enter B: "); int b = ip.nextInt(); System.out.print("Enter C: "); int c = ip.nextInt(); int great = a >= b ? (a >= c ? a : c) : (b >= c ? b : c); System.out.println("Greatest among three numbers is: " + great); ip.close(); } } OUTPUT: Enter A: 1 Enter B: 2 Enter C: 3 Greatest among three numbers is: 3 来源： https://www.cnblogs.com/sea-stream/p/12013070.html

Mobx总结以及mobx和redux区别

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Mobx解决的问题传统react使用的数据管理库为Redux。Redux要解决的问题是统一数据流，数据流完全可控并可追踪。要实现该目标，便需要进行相关的约束 Redux由此引出dispatch action reducer等概念，对state的概念进行强约束，然而对于一些项目来说，太过强，便失去了灵活性。Mobx便是填补此空缺的这里对Redux和Mobx进行简单的对比： 1.Redux的编程范式是函数式的而Mox是面向对象的； 2.因此数据上来说Redux理想的是immutable，每次都返回一个新的数据，而Mobx从始至终都是一份引用。因此Redux是支持数据回溯的； 3.然而和Redux相比，使用mobx的组件可以做到精准更新，这一点得益于Mobx的observable；对应的Redux是用dispath进行广播，通过Provider和connect来比对前后差别控制更新粒度，有时需要自己写SCU；Mox更加精细。 Mobx的核心原理是通过action触发state的变化，进而触发state的衍生对象（computed value & Reactions）。 State 　　在Moxbx中，state就对应业务的原始状态，通过observable方法，可以是这些状态变得可观察。通常支持被observable的类型有三个，分别是Object, Array, Map；

Get true or false with a given probability

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问题 I'm trying to write a function in c++ that will return true or false based on a probability given. So, for example if the probability given was 0.634 then, 63.4% of the time the function would return true. I've tried a few different things, and failed. Any help? 回答1: If you'd like to do this in C++11, you can use its various random number engines, combined with the uniform_real_distribution to provide a good result. The following code demonstrates: #include <random> std::knuth_b rand_engine;

How do programming languages handle huge number arithmetic

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问题 For a computer working with a 64 bit processor, the largest number that it can handle would be 2 64 = 18,446,744,073,709,551,616. How does programming languages, say Java or be it C, C++ handle arithmetic of numbers higher than this value. Any register cannot hold it as a single piece. How was this issue tackled? 回答1: There are lots of specialized techniques for doing calculations on numbers larger than the register size. Some of them are outlined in this wikipedia article on arbitrary

generate random numbers with no repeat in c#

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问题 How can I generate random numbers with no repeat in C#. I have one array and I want to fill every room with random numbers from 0 to 9. Each room shoud have diffrent numbers. I use this: for (int i = 0; i < 20; i++) { Random rnd = new Random(); int temp = 0; temp = rnd.Next(0, 9); page[i] = temp; } But I get same number in evey room's of array. 回答1: With such a small list of numbers to choose from you can simply generate a list that contains all of them and then shuffle them. 回答2: Your

What does the Reduce() JavaScript function do?

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问题 I found very useful function reduce() , and I'm using it, but I'm not sure if I understand it properly. Can any one help me to understand this function? Example: var arr = [1,2,3,4,5,6]; arr.reduce(function(p,n){ return p+n; },0); // Output 21 This is my understanding: Reduce() loop through every element of the array and returning previous + current value . Ex. 0+1, 1+2 etc. In this case this function will return [0] - return 1; [1] - return 3; [2] - return 5, [3] - return 7, [4] - return 9,

Javascript Error Line Numbers

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问题 I have a jsp with lots of javascript code. Whenever there is a javascript error on the page, shown in the status bar of the IE browser, the line number reported to contain the error, does not match with the line number that actually contains the error. I am doing a right click>view source to find the line number reported. But that line does not contain the error. The error, I assume, is in some other line. What could be the reason for the erroneous line numbers being reported. Please Help.

Avoiding overflow in integer multiplication followed by division

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问题 I have two integral variables a and b and a constant s resp. d . I need to calculate the value of (a*b)>>s resp. a*b/d . The problem is that the multiplication may overflow and the final result will not be correct even though a*b/d could fit in the given integral type. How could that be solved efficiently? The straightforward solution is to expand the variable a or b to a larger integral type, but there may not be a larger integral type. Is there any better way to solve the problem? 回答1: If

How do I validate an Australian Medicare number?

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问题 I'm developing an online form in which user-entered Medicare numbers will need to be validated. (My specific problem concerns Australian Medicare numbers, but I'm happy for answers regarding American ones too. This question is about Medicare numbers in general.) So how should I do it? (It would be good to have the answer in Javascript or a regex.) 回答1: The regex supplied by Jeffrey Kemp (March 11) would help to validate the allowed characters, but the check algorithm below should be enough to