switch-statement

问题 I have few experiences with t sql and I have to write a stored. This is my stored: USE myDatabase GO SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE PROCEDURE [dbo].[myStored] ( @myPar1 INT, @myPar2 SMALLDATETIME ) AS BEGIN SET NOCOUNT ON IF EXISTS ( SELECT 1 FROM myTable1 WHERE myPar1 = @myPar1 AND myPar2 = @myPar2 ) BEGIN DELETE FROM myTable1 WHERE myPar1 = @myPar1 AND myPar2 = @myPar2 END ELSE IF EXISTS ( SELECT 1 FROM myTable2 WHERE myPar2 = @myPar2 ) BEGIN INSERT INTO myTable1

问题 I'm confused. The following code has errors ("..." represents elided code): int byteOrder = ...; switch (byteOrder) { case HDF5Constants.H5T_ORDER_BE: return ByteOrder.BIG_ENDIAN; ... } The error is on the case statement and Eclipse complains "case expressions must be constant expressions". I looked in the source file for this and it has a long list of lines like this: final public static int H5T_ORDER_BE = H5.J2C( JH5T_ORDER_BE ); I thought you could use final public static int constants as

问题 I have the following JavaScript on my site so that when certain specific searches are performed, the answer is hardcoded to a specific page: function redirect() { var input = document.getElementById('searchBox').value.toLowerCase(); switch (input) { case 'rectangular': window.location.replace('http://www.Example.com/Rectangular/'); break; case 'elephant': window.location.replace('http://www.Example.com/Elephants/'); break; case 'coils': window.location.replace('http://www.Example.com/Parts/')

问题 My text in my switch defined in a xml file won't to change it's color stay black as the activity background. I tried with the textcolor option without any success. Any ideas? My xml file <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#000000"> <LinearLayout android:orientation="horizontal" android

问题 string liquidClass = string.Empty; switch (cmbLiquidClass.Text) { case "LiquidClass1": liquidClass = Settings.Default.LiquidClass1; break; case "LiquidClass2": liquidClass = Settings.Default.LiquidClass2; break; case "LiquidClass3": liquidClass = Settings.Default.LiquidClass3; break; case "LiquidClass4": liquidClass = Settings.Default.LiquidClass4; break; case "LiquidClass5": liquidClass = Settings.Default.LiquidClass5; break; case "LiquidClass6": liquidClass = Settings.Default.LiquidClass6;

问题 Below is code that declares two int variables and tries to use them in a switch statement. Is this a legal operation in C++? If not, why not? int i = 0; int x = 3; switch (i) { case x: // stuff break; case 0: // other stuff break; } 回答1: The case label must be an integral constant expression , so your example is invalid. But if x were changed to: const int x = 3; then it's valid. 回答2: Can switch statements use variables? Yes. This is fine, int i = 0; switch (i) { } But, case statements cannot

问题 After installing PHP 5.5.9 on Ubuntu 14 I found this strange behavior with a switch statement and the PHP_OS constant. I presume that in PHP 5.5.9 the switch statement is also checking for the same type (===)? Or is it a PHP bug? echo PHP_OS; // Linux $os = PHP_OS; switch (PHP_OS) { case "WINNT": echo 'Windows'; break; case "Linux": echo 'Linux'; break; default: echo 'Default'; break; } // Default switch ((string) PHP_OS) { case "WINNT": echo 'Windows'; break; case "Linux": echo 'Linux';

问题 Two constants (1+2) share the same case statement. I don´t want to double the code. What is the right syntax to do this? switch (expression) { case 0: [self taskA]; break; case 1: [self taskB]; break; case 2: [self taskB] break; default: break; } 回答1: Use : switch (expression) { case 0: [self taskA]; break; case 1: case 2: [self taskB]; break; default: break; } Edit 1: In switch we say a term called fall-through . Whenever control reaches to a label say case 0: it falls till break is found.

问题 The following code crashes the Microsoft compiler: class Var { public: template <typename T> operator T () const { } }; int main() { Var v; switch (v) { } } My question: Is the code correct or should the compiler give an appropriate error? Is an unambiguous conversion to an integral type possible? 回答1: The compiler crashing is always a bug, this code does not compile on either gcc or clang but both provide an error without crashing. For clang the error is: error: statement requires expression

问题 I'm trying to make it so that when you click a link, it removes a div (with some paragraphs and text) and inserts another div (with some paragraphs and some text). I'm using jQuery to fade those in and out. The fading out of the original div works when you click the link, and then I have a switch case to determine what gets faded in. However, the fadeIn, set to 'slow', appears to be occurring immediately. Here's the relevant piece of code (the rest is just other cases): $(document).ready