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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.
Microsoft Excel is a spreadsheet editor developed by Microsoft for Windows, macOS, Android, iOS and iPadOS. It features calculation or computation capabilities, graphing tools, pivot tables, and a macro programming language called Visual Basic for Applications (VBA). Excel forms part of the Microsoft 365 suite of software.
HELP:ifexist. The #ifexist function selects one of two alternatives depending on whether a page exists at the specified title. {{#ifexist: page title | value if page exists | value if page doesn't exist }} The page can be in any namespace, so it can be an article or "content page", an image or other media file, a category, etc.
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 ...
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. Although many #switch structures are used to branch among a simple set of ...
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The table below shows the output from a template call (we'll call the template { { Conditional tables/example 1 }}) with different values for { { {variable_foo}}} : Positional parameters { { {1}}} etc. work like named parameters: Note how the pipe symbol (vertical bar) in the link works as is, it's not quite that easy within Wiki tables, see below.
The dangling else is a problem in programming of parser generators in which an optional else clause in an if–then (–else) statement results in nested conditionals being ambiguous. Formally, the reference context-free grammar of the language is ambiguous, meaning there is more than one correct parse tree. In many programming languages one ...
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