C language commonly used 32 keywords

Char	Character variable or function return value	Short	Short-Integer variable	Int	Integer variable	Unsigned	No sign
Long	Long-integer variable	Float	Single-precision floating-point type	Double	Double-precision floating-point type	struct	struct type
Union	Common body Type	void	function no return value, no argument, no type pointer	Enum	Enum type	Signed	have symbols
Const	Read-only variables	Volatile	Variables can be implicitly changed in program execution	typedef	Used to alias data types	Auto	Automatic variables
Register	Register variable	Static	static variables	Extem	A variable or function is defined in another file or elsewhere in this file	Break	Jump out of the current loop
Case	Switch Statement Branch	Continue	End the current loop and start the next round	Default	The "other" branch in the switch statement	Do	Loop body of a looping statement
Else	Conditional Statement Negation Branch	For	A circular statement	Goto	Unconditional Jump Statement	If	Conditional statements
Return	Subroutine return statement	Switch	For switch statements	While	Looping conditions for a loop statement	sizeof	Calculate data type or variable length

C language commonly used 32 keywords