Undefined values: Difference between revisions
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[http://seed7.sourceforge.net/libraries/external_file.htm#open%28in_string,in_string%29 open], |
[http://seed7.sourceforge.net/libraries/external_file.htm#open%28in_string,in_string%29 open], |
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when a file cannot be opened. |
when a file cannot be opened. |
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=={{header|Smalltalk}}== |
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In Smalltalk, all variables are automatically initialized to nil. This includes instance variables (an object's private slots), class variables and locals. Thus a variable cannot ever be undefined. |
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=={{header|Tcl}}== |
=={{header|Tcl}}== |
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