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Simon Tatham's coroutines in C utilizes the same switch/case trick; Adam Dunkels's Protothreads - Lightweight, Stackless Threads in C also uses nested switch/case statements (see also The lightest lightweight threads, Protothreads) Pigeon's device is a related technique: intertwined switch/case and if/else statements
Switch statements function somewhat similarly to the if statement used in programming languages like C/C++, C#, Visual Basic .NET, Java and exist in most high-level imperative programming languages such as Pascal, Ada, C/C++, C#, [1]: 374–375 Visual Basic .NET, Java, [2]: 157–167 and in many other types of language, using such keywords as ...
Switch statements (or case statements, or multiway branches) compare a given value with specified constants and take action according to the first constant to match. There is usually a provision for a default action ("else", "otherwise") to be taken if no match succeeds. Switch statements can allow compiler optimizations, such as lookup tables.
The switch parser function, coded as "#switch", selects the first matching branch in a list of choices, acting as a case statement. Each branch can be a value , an expression ( calculation ), or a template call, [ 1 ] evaluated and compared to match the value of the switch.
For example, one can write a fully recursive-nestable SWITCH–CASE–DEFAULT–ENDSWITCH statement using this macro facility. Because of the HLA macro facilities context-free design, these switch..case..default..endswitch statements can be nested, and the nested statements' emitted code will not conflict with the outside statements.
If the statements in the loop are independent of each other (i.e. where statements that occur earlier in the loop do not affect statements that follow them), the statements can potentially be executed in parallel. Can be implemented dynamically if the number of array elements is unknown at compile time (as in Duff's device).
Nested functions can be used for unstructured control flow, by using the return statement for general unstructured control flow.This can be used for finer-grained control than is possible with other built-in features of the language – for example, it can allow early termination of a for loop if break is not available, or early termination of a nested for loop if a multi-level break or ...
Number = 6 Then 'Select Case statement is typically better solution Resume FinallyLabel 'continue execution on specific label. Typically something with meaning of "Finally" in other languages 'or Resume Next 'continue execution on statement next to "Err.Raise 6" 'or Resume 'continue execution on (repeat) statement "Err.Raise 6" End If MsgBox Err .