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021. undefined variable access

VBScript

JScript

Perl

error under use strict; otherwise undef

PHP

NULL

Python

raises NameError

Ruby

raises NameError

PowerShell

Scala

F#

C

C++

C++Builder

VC++

C#

Java

Objective-C

D

VB

VB.NET

Delphi

Ada

PL/SQL

T-SQL