switch-statement | 易学教程

If / Else / Switch returning the wrong results

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问题 I'm making a Rock-Paper-Scissors-Lizard-Spock (Big Bang Theory, the tv show) using ReactJS and i'm facing some kind of abstract issue. switch (this.state.playerOnePick === 'Rock') { case((this.state.playerTwoPick === 'Scissors') || (this.state.playerTwoPick === 'Lizard')): return ( <div> <h1>Player One wins !</h1> <h2>P1: {this.state.playerOnePick} P2: {this.state.playerTwoPick}</h2> </div> ); break; case((this.state.playerTwoPick === 'Paper') || (this.state.playerTwoPick === 'Spock')):

Passing a value from one case to another in switch statement

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问题 So here is a sample code : import java.util.Scanner; public class Test { public static void main(String[] args) { System.out.println("Please type in a number"); Scanner in = new Scanner(System.in); switch (in.nextInt()){ case 1: save(in); break; case 2: System.out.println(value); break; default: System.out.println("Default case"); break; } in.close(); } public static String save(Scanner in){ System.out.println("Type in a word"); String value = in.next(); return value; } } In this particular

Get the name of the requested subobject javascript

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问题 If I have an object with an anonymous function inside how do I know what subobject is being requested so that I can return a value? var obj = function(a) { switch (a) { case 'subprop1': return 'subval1'; case 'subprop2': return 'subval2'; case 'subprop3': return 'subval3'; default: return 'defaultval'; } } So if I call: obj.subprop1 I should get: subval1 回答1: This is not really possible with plain objects unless your environment supports Proxy. In this case it would be quite easy (haven't

listview toggle switch works only last row

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问题 i'm facing a problem which is, when i toggle switch it's works for only last item of listview. It doesn't matter which switch i toggle. I research other asked questions but i couldn't figure it out. @Override public View getView(int position, View convertView, ViewGroup parent) { LayoutInflater inflater = LayoutInflater.from(getContext()); View customView = inflater.inflate(R.layout.row, parent, false); String allData = getItem(position); final Switch status = (Switch) customView.findViewById

GCC Jump Table initialization code generating movsxd and add?

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问题 When I compile a switch statement with optimization in GCC, it sets up a jump table like this, (fcn) sym.foo 148 sym.foo (unsigned int arg1); ; arg unsigned int arg1 @ rdi 0x000006e0 83ff06 cmp edi, 6 ; arg1 0x000006e3 0f87a7000000 ja case.default.0x790 0x000006e9 488d156c0100. lea rdx, [0x0000085c] 0x000006f0 89ff mov edi, edi 0x000006f2 4883ec08 sub rsp, 8 0x000006f6 486304ba movsxd rax, dword [rdx + rdi*4] 0x000006fa 4801d0 add rax, rdx ; '(' ;-- switch.0x000006fd: 0x000006fd ffe0 jmp rax

JavaScript switch statement only executes the default case

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问题 I'm new to JavaScript and wrote this short script to choose a random background color for the body of my page, but it only keeps executing the default case. I don't know what's the problem. <!DOCTYPE html> <html> <head lang="en"> <meta charset="UTF-8"> <script> function chC(){ var cl=document.getElementById('demo'); var colNo=Math.random()*4; switch (colNo){ case 1:{ cl.style.background='red'; } case 2:{ cl.style.background='yellow'; } case 3:{ cl.style.background='pink'; } default :{ cl

Is there a way for switch to return a string value using C# 8 switch expressions?

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问题 I have this code where each part of the switch returns a value to ModeMessage2 . Is it possible using the new C# switch expressions (or any other code optimization) to optimize the way this switch works? switch (Settings.Mode) { case MO.Learn: ModeMessage2 = "Use this mode when you are first learning the phrases and their meanings."; if (Settings.Cc == CC.H) { Settings.Cc = CC.JLPT5; App.cardSetWithWordCount = null; App.DB.RemoveSelected(); } break; case MO.Practice: ModeMessage2 = "Use this

Using user-inputted characters in If/Switch statements

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问题 I am taking my first Java class, and am having a hard time finishing this assignment. The assignment itself is quite simple. All I have to do is prompt the user to input an integer, a character, then another integer. If the character inputted is +, the two integers should be added together. If the character inputted is -, the two integers should be subtracted. Etc... The problem is that I do not know how to accept a character from the user, then use it in my If/Switch statements. Here are my

multidimensional index by array of indices in JavaScript

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问题 Is there a way in JavaScript to select a element of a multidimential array. Where the depth/rank/dimensionality is variable and the keys are given by a array of indices. Such that i don't have handle every possible dimentional depth separately. concretely speaking i want do get rid of switch cases like here: /** * set tensor value by index * @type {array} indices [ index1, index2, index3 ] -> length == rank. * @type {string} value. */ tensor.prototype.setValueByIndex = function( indices,

Does a variable defined inside a switch/case persists it's value? [closed]

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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 5 years ago . I know that it is possible to create, but not initalize, a variable inside a switch-statement. But I wonder if a created variable remains in memory, during subsequent executions of the switch-statement? I assume the variable named cnt is newley created every time the switch-statement is executed. Therefore the