An undefined variable in the source code of a computer program is a variable that is accessed in the code but has not been declared by that code. In some programming languages, an implicit declaration is provided the first time such a variable is encountered at compile time.
An undefined variable in the source code of a computer program is a variable that is accessed in the code but has not been declared by that code. In some programming languages, an implicit declaration is provided the first time such a variable is encountered at compile time.
Source: Wikipedia "Undefined variable" · CC BY-SA 4.0
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