32 keywords defined in C Language

This article introduces the usage of 32 keywords defined in the C language standard. For more information, see.

Keywords	Meaning
Auto	Declare automatic variables. The default value of the time-saving compiler is auto. Function call is to allocate space, call ends, and release space.
Int	Declare int;
Double	Declare double;
Long	Declare long integer variable long;
Char	Declare the character type variable char a []; different from C # char [];
Float	Declare float;
Short	Declare a short integer variable
Signed	Declare signed type variables
Unsigned	Declare an unsigned Type Variable
Struct	Declare struct Variables Struct student { String name; Int age; } // Widely used
Union	Declare federated Data Types
Enum	Declare Enumeration type
Static	Declare static variables
Switch	Switch statement
Case	Switch statement
Default	Other branches in the switch statement
Break	Jump out of the current loop
Register	Declare register variables
Const	Declare Read-Only variables
Volatile	It indicates that the variable is implicitly changed during program execution.
Typeof	Swimsuit uses aliases for data types to enhance program portability
Extern	Declared variables are declared in other files
Return	Subroutine Return Statement
Void	Declare a function with no return value or no parameter, and declare a null pointer.
Continue	End the current cycle and start the next cycle
Do	Execute the loop body statement
While	Loop condition of the loop body statement
If	Condition Statement
Else	Condition Statement negative Branch
For	A loop statement
Goto	Unconditional jump statement
Sizeof	Memory space occupied by computing objects