Undefined values: Difference between revisions
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then if you make the mistake of writing your program such that it at some point requires the value of <code>resurrect 0</code>, you'll get the error message "I'm out of orange smoke!". |
then if you make the mistake of writing your program such that it at some point requires the value of <code>resurrect 0</code>, you'll get the error message "I'm out of orange smoke!". |
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== Icon and Unicon == |
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Icon/Unicon don't really have a notion of an undefined variable. There is a [[Undefined_values/Check_if_a_variable_is_defined|null value/data type that can be tested]]. However, it is possible in Unicon to interrogate the environment and obtain the string names of variables in the current (or calling procedures). |
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==={{header|Icon}}=== |
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These functions don't exist in Icon. |
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==={{header|Unicon}}=== |
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<lang Unicon>global G1 |
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procedure main() |
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local M1 |
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undeftest() |
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end |
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procedure undeftest(P1) |
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static S1 |
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local L1,L2 |
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every #write all local, parameter, static, and global variable names |
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write((localnames|paramnames|staticnames|globalnames)(¤t,0)) # ... visible in the current co-expression at this calling level |
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return |
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end</lang> |
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=={{header|J}}== |
=={{header|J}}== |
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