An undefined variable in the source code of a computer program is a variable that is accessed in the code but has not been previously declared by that code. In some programming languages an implicit declaration is provided the first time such a variable is encountered at compile time or run time error. In other languages such a usage is considered to be a fatal error, resulting an a diagnostic being issued.
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- An undefined variable in the source code of a computer program is a variable that is accessed in the code but has not been previously declared by that code. In some programming languages an implicit declaration is provided the first time such a variable is encountered at compile time or run time error. In other languages such a usage is considered to be a fatal error, resulting an a diagnostic being issued. Some languages have started out with the implicit declaration behavior but as they matured they provided an option to disable it (e.g. Perl's "use strict" or Visual Basic's "Option Explicit").
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- An undefined variable in the source code of a computer program is a variable that is accessed in the code but has not been previously declared by that code. In some programming languages an implicit declaration is provided the first time such a variable is encountered at compile time or run time error. In other languages such a usage is considered to be a fatal error, resulting an a diagnostic being issued.
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