![]() , x n) shall have the value given by the first clause which applies) is primitive recursive in φ 1. , Q m are mutually exclusive predicates (or φ(x 1. In his 1952 text Introduction to Metamathematics, Stephen Kleene formally proved that the CASE function (the IF-THEN-ELSE function being its simplest form) is a primitive recursive function, where he defines the notion definition by cases in the following manner: The main reasons for using a switch include improving clarity, by reducing otherwise repetitive coding, and (if the heuristics permit) also offering the potential for faster execution through easier compiler optimization in many cases. Switch statements come in two main variants: a structured switch, as in Pascal, which takes exactly one branch, and an unstructured switch, as in C, which functions as a type of goto. NET, Java, : 157–167 and in many other types of language, using such keywords as switch, case, select or inspect. NET, Java and exist in most high-level imperative programming languages such as Pascal, Ada, C/ C++, C#, : 374–375 Visual Basic. Switch statements function somewhat similarly to the if statement used in programming languages like C/ C++, C#, Visual Basic. In computer programming languages, a switch statement is a type of selection control mechanism used to allow the value of a variable or expression to change the control flow of program execution via search and map. ![]() Type of selection control mechanism in computer programming languages
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