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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 if–then or if–then–else construction is used in many programming languages. Although the syntax varies from language to language, the basic structure (in pseudocode form) looks like this: If (Boolean condition) Then (consequent) Else (alternative) End If. For example: If stock=0 Then message= order new stock Else message= there is ...
If x = y Then result = value1 Else result = value2 End If The above example would also eliminate the problem of IIf evaluating both its truepart and falsepart parameters. Visual Basic 2008 (VB 9.0) introduced a true conditional operator , called simply "If", which also eliminates this problem.
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The dangling else is a problem in programming of parser generators in which an optional else clause in an if–then(–else) statement can make nested conditional statements ambiguous. Formally, the reference context-free grammar of the language is ambiguous , meaning there is more than one correct parse tree .
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Flowchart illustrating the use of else if. The conditional expression is condition, and if it is true, then code block 1 is executed, otherwise code block 2 is executed. It is also possible to combine multiple conditions with the else-if construct: if condition 1 then code block 1 else if condition 2 then code block 2 else code block 3 end
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