Identifiers,Data Types and Syntax of C/C++ Language

Identifiers and Data Types will be Discussed in This Article. © CB9 Images

Identifiers:

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The Identifiers are the names used to represent variables, constants, types, functions and labels in the program. A good identifier name should be descriptive but short.The basic rules for identifiers are as follows:

• An Identifier in C++ may consist of 31 characters.
• The first character must be an alphabetic or underscore (_).
• The identifier name must consist of only alphabetic characters, digits or underscores. 
• The Reserved word cannot be used as identifier name e.g, cout, cin etc

Types of Identifiers: 

There are two types of identifiers in C++ Language

1. Standard Identifier
2. User-Defined Identifier

Standard Identifier:

Standard Identifier has special name and meanings in C++ Language. cout and cin etc are Standard Identifiers. <iostrea.h> library is used for these identifiers.

User-Defined Identifier:

These Identifiers are made by the user. The User-Defined Identifiers are used to store data and program result. e.g, a, b, car, rollno etc are examples of this.

Keywords:

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Keywords in C/C++ Programming Language are also called reserved words. These words have specific meanings and and purpose in C/C++ Programming Language. There are different types of keywords in C/C++ Programming Language. The total number of keywords is 63.

List of 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