VB.Net Keywords

The following table lists the VB.Net reserved keywords:

AddHandler	AddressOf	Alias	And	AndAlso	As	Boolean
ByRef	Byte	ByVal	Call	Case	Catch	CBool
CByte	CChar	CDate	CDec	CDbl	Char	CInt
Class	CLng	CObj	Const	Continue	CSByte	CShort
CSng	CStr	CType	CUInt	CULng	CUShort	Date
Decimal	Declare	Default	Delegate	Dim	DirectCast	Do
Double	Each	Else	ElseIf	End	End If	Enum
Erase	Error	Event	Exit	False	Finally	For
Friend	Function	Get	GetType	GetXML Namespace	Global	GoTo
Handles	If	Implements	Imports	In	Inherits	Integer
Interface	Is	IsNot	Let	Lib	Like	Long
Loop	Me	Mod	Module	MustInherit	MustOverride	MyBase
MyClass	Namespace	Narrowing	New	Next	Not	Nothing
Not Inheritable	Not Overridable	Object	Of	On	Operator	Option
Optional	Or	OrElse	Overloads	Overridable	Overrides	ParamArray
Partial	Private	Property	Protected	Public	RaiseEvent	ReadOnly
ReDim	REM	Remove Handler	Resume	Return	SByte	Select
Set	Shadows	Shared	Short	Single	Static	Step
Stop	String	Structure	Sub	SyncLock	Then	Throw
To	True	Try	TryCast	TypeOf	UInteger	While
Widening	With	WithEvents	WriteOnly	Xor

C# Keywords

Keywords are reserved words predefined to the C# compiler. These keywords cannot be used as identifiers. However, if you want to use these keywords as identifiers, you may prefix the keyword with the @ character.
In C#, some identifiers have special meaning in context of code, such as get and set are called contextual keywords.
The following table lists the reserved keywords and contextual keywords in C#:

Reserved Keywords
abstract	as	base	bool	break	byte	case
catch	char	checked	class	const	continue	decimal
default	delegate	do	double	else	enum	event
explicit	extern	false	finally	fixed	float	for
foreach	goto	if	implicit	in	in (generic modifier)	int
interface	internal	is	lock	long	namespace	new
null	object	operator	out	out (generic modifier)	override	params
private	protected	public	readonly	ref	return	sbyte
sealed	short	sizeof	stackalloc	static	string	struct
switch	this	throw	true	try	typeof	uint
ulong	unchecked	unsafe	ushort	using	virtual	void
volatile	while
Contextual Keywords
add	alias	ascending	descending	dynamic	from	get
global	group	into	join	let	orderby	partial (type)
partial (method)	remove	select	set

Java Language Keywords

Here is a list of keywords in the Java programming language. You cannot use any of the following as identifiers in your programs. The keywords const and goto are reserved, even though they are not currently used. true, false, and null might seem like keywords, but they are actually literals; you cannot use them as identifiers in your programs.

abstract	continue	for	new	switch
assert***	default	goto*	package	synchronized
boolean	do	if	private	this
break	double	implements	protected	throw
byte	else	import	public	throws
case	enum****	instanceof	return	transient
catch	extends	int	short	try
char	final	interface	static	void
class	finally	long	strictfp**	volatile
const*	float	native	super	while

*		not used
**		added in 1.2
***		added in 1.4
****		added in 5.0

C++ Keywords

C++ Keywords

There are 60 key words currently defined for C++. They are shown in Table 1.0 below. Together with the formal C++ syntax, they form the C++ programming language. Keep in mind to avoid giving these keywords as names of variables.

Table 1.0: C++ Keywords
Asm	auto	bool	break	case
catch	char	class	const_cast	continue
default	delete	do	double	else
enum	dynamic_cast	extern	false	float
for	union	unsigned	using	friend
goto	if	inline	int	long
mutable	virtual	namespace	new	operator
private	protected	public	register	void
reinterpret_cast	return	short	signed	sizeof
static	static_cast	volatile	struct	switch
template	this	throw	true	try
typedef	typeid	unsigned	wchar_t	while

C++ is a case sensitive language, and it requires that all key words be in lowercase.

C Keywords

Keywords in C Programming Language :

1. Keywords are those words whose meaning is already defined by Compiler
2. Cannot be used as Variable Name
3. There are 32 Keywords in C
4. C Keywords are also called as Reserved words .

32 Keywords in C Programming Language

auto	double	int	struct
break	else	long	switch
case	enum	register	typedef
char	extern	return	union
const	float	short	unsigned
continue	for	signed	void
default	goto	sizeof	volatile
do	if	static	while

Java Script Keywords

Reserved words of the JavaScript langauge are listed below. (Some of these words are actually used in the Java language, and are reserved in JavaScript for compatibility purposes or as possible extensions.) When choosing names for your JavaScript variables, avoid these reseved words!

abstract	else	instanceof	super
boolean	enum	int	switch
break	export	interface	synchronized
byte	extends	let	this
case	false	long	throw
catch	final	native	throws
char	finally	new	transient
class	float	null	true
const	for	package	try
continue	function	private	typeof
debugger	goto	protected	var
default	if	public	void
delete	implements	return	volatile
do	import	short	while
double	in	static	with

In addition to the above reserved words, you'd better avoid the following identifiers as names of JavaScript variables. These are predefined names of implementation-dependent JavaScript objects, methods, or properties (and, arguably, some should have been reserved words):

alert	frames	outerHeight
all	frameRate	outerWidth
anchor	function	packages
anchors	getClass	pageXOffset
area	hasOwnProperty	pageYOffset
Array	hidden	parent
assign	history	parseFloat
blur	image	parseInt
button	images	password
checkbox	Infinity	pkcs11
clearInterval	isFinite	plugin
clearTimeout	isNaN	prompt
clientInformation	isPrototypeOf	propertyIsEnum
close	java	prototype
closed	JavaArray	radio
confirm	JavaClass	reset
constructor	JavaObject	screenX
crypto	JavaPackage	screenY
Date	innerHeight	scroll
decodeURI	innerWidth	secure
decodeURIComponent	layer	select
defaultStatus	layers	self
document	length	setInterval
element	link	setTimeout
elements	location	status
embed	Math	String
embeds	mimeTypes	submit
encodeURI	name	taint
encodeURIComponent	NaN	text
escape	navigate	textarea
eval	navigator	top
event	Number	toString
fileUpload	Object	undefined
focus	offscreenBuffering	unescape
form	open	untaint
forms	opener	valueOf
frame	option	window

Similarly, the following names (depending on your target browser) may have special meanings as event handlers, and therefore should not be used for any other purpose:

onbeforeunload	ondragdrop	onkeyup	onmouseover
onblur	onerror	onload	onmouseup
ondragdrop	onfocus	onmousedown	onreset
onclick	onkeydown	onmousemove	onsubmit
oncontextmenu	onkeypress	onmouseout	onunload