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- Dangling_else abstract "The dangling else is a problem in computer programming 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 may write conditionally executed code in two forms: the if-then form, and the if-then-else form – the else clause is optional:if a then sif a then s1 else s2This gives rise to an ambiguity in interpretation when there are nested statements, specifically whenever an if-then form appears as s1 in an if-then-else form:if a then if b then s else s2In this example, s is unambiguously executed when a is true and b is true, but one may interpret s2 as being executed when a is false (thus attaching the else to the first if) or when a is true and b is false (thus attaching the else to the second if). In other words, one may see the previous statement as either of the following expressions:if a then (if b then s) else s2 orif a then (if b then s else s2)The dangling else problem dates to ALGOL 60, and has been resolved in various ways in subsequent languages. In LR parsers, the dangling else is the archetypal example of a shift-reduce conflict.".
- Dangling_else wikiPageID "648096".
- Dangling_else wikiPageRevisionID "602063017".
- Dangling_else hasPhotoCollection Dangling_else.
- Dangling_else subject Category:Ambiguity.
- Dangling_else subject Category:Computer_programming.
- Dangling_else subject Category:Parsing.
- Dangling_else comment "The dangling else is a problem in computer programming in which an optional else clause in an if–then(–else) statement results in nested conditionals being ambiguous.".
- Dangling_else label "Dangling else problem".
- Dangling_else label "Dangling else".
- Dangling_else label "Dangling else".
- Dangling_else sameAs Dangling_else.
- Dangling_else sameAs Dangling_else_problem.
- Dangling_else sameAs m.02_ck8.
- Dangling_else sameAs Q1159631.
- Dangling_else sameAs Q1159631.
- Dangling_else wasDerivedFrom Dangling_else?oldid=602063017.
- Dangling_else isPrimaryTopicOf Dangling_else.