Undefined values: Difference between revisions
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{{task|Programming language concepts}}For languages which have an explicit notion of an undefined value, identify and exercise those language's mechanisms for identifying and manipulating a variable's value's status as being undefined.
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=={{header|6502 Assembly}}==
Undefined values don't exist per se, but reading from write-only memory-mapped ports can result in undefined behavior, namely, the contents of the read can be whatever was on the data bus last.
=={{header|ActionScript}}==
ActionScript has a special '''undefined''' value which applies to untyped variables and properties of dynamic classes which have not been initialized.
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