switch(expression){casevalue1:// 当 expression 等于 value1 时执行的代码break;casevalue2:// 当 expression 等于 value2 时执行的代码break;default:// 当没有匹配项时执行的代码} 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 2. 执行效率对比 从执行效率的角度来看,i
1. if-else 两个调用相同的Function,但是参数不同, 通常情况性能下降一半 2 使用Constants 或者Load/Fetch来替代大量的if-elseif实现查找表 lookup table 3 使用多个if语句替代if-elseif以使用少量的ALU来替代分支语句。 4 switch-case优化 1. if-else 两个调用相同的Function,但是参数不同, 通常情况性能下降一半...
switch(a){case0:...;break;case1:...;break;} 如果编译器真的为此生成了一个跳转表,那么由于跳转表破坏了分支预测,替代的if..else if..样式的代码可能会慢一些。 正如康拉德所说,编译器可以构建一个跳转表。 在C++中,它之所以可以是因为交换机的限制。 比较项必须转换为int。 case labl必须是常量。 swi...
The results show that the switch statement is faster to execute than the if-else-if ladder. This is due to the compiler's ability to optimise the switch statement. In the case of the if-else-if ladder, the code must process each if statement in the order determined by the programmer. ...
如果有两个以上 if/else 粘在一起或其大小是不可预测的块,那么您可能会非常考虑一个 switch 陈述。或者,您也可以抓住 多态性。首先创建一些界面:public interface Action { void execute(String input); }并在某些情况下掌握所有实现 Map。您可以静态或动态地执行以下操作:Map...
Expression.SwitchCase Method (Expression, array<Expression[]) Microsoft Silverlight will reach end of support after October 2021. Learn more. Creates a SwitchCase for use in a SwitchExpression. Namespace: System.Linq.Expressions Assembly: System.Core (in System.Core.dll) Syntax VB 複製 'Dec...
If vs Switch Caseis one of clarity. It shouldn't make much difference in term of performance.
Case Study: A Few Packets Are Dropped 2 Minutes After the Multicast Service Is Enabled on a SwitchInvolved Products and Versions S series switches of all versions Networking Description As shown in the figure, a switch is upstream to a multicast server and downstr...
To ensure the best Mesh performance, It is recommended that all network cables (RJ45) be CAT5e or larger. In this case, the Main AiMesh router and all other AiMesh nodes which directly connect to your modem need to be set in AP mode (Bridge mode), and it will get IP address from you...
Use of switch case statements as a cleaner, more maintainable way of doing something that you often see done with else/if statements.