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Switch statements come in two main variants: a structured switch, ... (the IF-THEN-ELSE function being its simplest form) is a primitive recursive function, ...
If-then-else flow diagram A nested if–then–else flow diagram. In computer science, conditionals (that is, conditional statements, conditional expressions and conditional constructs) are programming language constructs that perform different computations or actions or return different values depending on the value of a Boolean expression, called a condition.
The detailed semantics of "the" ternary operator as well as its syntax differs significantly from language to language. A top level distinction from one language to another is whether the expressions permit side effects (as in most procedural languages) and whether the language provides short-circuit evaluation semantics, whereby only the selected expression is evaluated (most standard ...
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 function selects between multiple alternatives based on an input string. {{#switch: test string | case1 = value for case 1 | ... | default value}} Equivalent to the switch statement found in some programming languages, it is a convenient way of dealing with multiple cases without having to chain lots of #if functions together ...
A demonstration that the nested IF-THEN-ELSE—the "case statement" (or "switch statement")--is primitive recursive can be found in Kleene 1952:229 [4] at "#F ('mutually-exclusive predicates')". The CASE operator behaves like a logical multiplexer and is simply an extension of the simpler two-case logical operator sometimes called AND-OR-SELECT ...
Although many #switch structures are used to branch among a simple set of values, the branches can also include boolean expressions to act as a set of pre-conditions to be tested until one tests true, acting as an if-elseif-elseif-elseif-else structure. A #switch can contain over 1,000 branches, but for better speed should be split to have less ...
Switch statements in Java can use byte, short, char, and int (not long) primitive data types or their corresponding wrapper types. Starting with J2SE 5.0, it is possible to use enum types. Starting with Java SE 7, it is possible to use Strings. [2] Other reference types cannot be used in switch statements. Possible values are listed using case ...