Undefined variable

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. In other languages such a usage is considered to be sufficiently serious that a diagnostic being issued and the compilation fails.

单词	Undefined variable
释义	Undefined variable 英语百科 Undefined variable 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. In other languages such a usage is considered to be sufficiently serious that a diagnostic being issued and the compilation fails.
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