Keywords in C programming

Keywords There are certain reserved words, called keywords that have standard, predefined meanings in C. these keywords can be used only for their intended purpose; they cannot be used as programmer defined identifiers. The ANSI (American National Standards Institute) C defines the following 32 keywords.

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

Data Types C supports several different types of data, each of which may be represented differently within the computer‟s memory. A data type defines the amount of memory that will be used during program execution, valid range of values it can represent, and the operations that may be performed on it. C is strongly typed language so every variable in C must be declared of specific type explicitly. Data types can be either predefined or derived. The C language supports four basic data types, each of which are represented differently within the computer memory. The basic types for a particular compiler are listed below: