List of standard keyword in C programming language

Data types	Qualifiers	User-defined	Storage Classes	Loop	Decision	Jump	Derived	function	Other
int	signed	enum	extern	for	if	goto	struct	void	const
char	unsigned		register	while	else	continue	union	return	volatile
float	short		static	do	switch	break			sizeof
double	long		auto		case
					default

Brief introduction of standard keywords and their specification:

Data type Keywords:

int	Specifies the integer type of value a variable will hold
char	Specifies the character type of value a variable will hold
float	Specifies the single-precision floating-point of value a variable will hold
double	Specifies the double-precision floating-point type of value a variable will

Qualifier Keywords:

signed	Specifies a variable can hold positive and negative integer type of data
unsigned	Specifies a variable can hold only the positive integer type of data
short	Specifies a variable can hold fairly small integer type of data
long	Specifies a variable can hold fairly large integer type of data

Loop Control Structure Keywords

for	Loop is used when the number of passes is known in advance
while	Loop is used when the number of passes is not known in advance
do	Loop is used to handle menu-driven programs

User-defined type Keywords

typedef	Used to define a new name for an existing data type
enum	Gives an opportunity to invent own data type and define what values the variable of this data type can take

Jumping Control Keywords

break	Used to force immediate termination of a loop, bypassing the conditional expression and any remaining code in the body of the loop
continue	Used to take the control to the beginning of the loop bypassing the statements inside the loop
goto	Used to take the control to required place in the program