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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 ...
In the C programming language, Duff's device is a way of manually implementing loop unrolling by interleaving two syntactic constructs of C: the do-while loop and a switch statement. Its discovery is credited to Tom Duff in November 1983, when Duff was working for Lucasfilm and used it to speed up a real-time animation program.
The goto statement can be used in switch statements to jump from one case to another or to fall through from one case to the next. switch ( n ) { case 1 : Console . WriteLine ( "Case 1" ); break ; case 2 : Console .
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 most common statement is an expression statement, consisting of an expression to be evaluated, followed by a semicolon; as a side effect of the evaluation, functions may be called and variables assigned new values. To modify the normal sequential execution of statements, C provides several control-flow statements identified by reserved ...
switch: In C#, the switch statement also operates on strings and longs. Fallthrough is allowed for empty statements and possible via 'goto case' for statements containing code. Java's switch statement operates on strings (since Java 7) but not the long primitive type, and falls through for all statements (excluding those with ' break '). [49 ...
However, for many uses of the switch statement in real code, it is possible to avoid branching altogether and replace the switch with one or more table look-ups. For example, the Has30Days example [presented earlier] can be implemented as the following:[C example]" "A Superoptimizer Analysis of Multiway Branch Code Generation" by Roger Anthony ...
The equivalent construct in C is the switch statement, and in newer Fortran a SELECT CASE construct is the recommended syntactical alternative. [45] BASIC had a 'On GoTo' statement that achieved the same goal, but in Visual Basic this construct is no longer supported. [46]