32 keywords in C language and 32 keywords in C Language

32 keywords in C language and 32 keywords in C Language

The C language contains 32 important and commonly used keywords, which are listed below:

32 keywords in C Language
Category 1: Data Type keywords	A basic data type (5)	Void	If the declared function has no return value or no parameter, it declares that there is no type pointer and the operation result is explicitly discarded.
		Char	String type data is a type of integer data.
		Int	Integer Data, usually the machine font specified by the compiler.
		Float	Single-precision floating point data is a type of floating point data, which stores 6 digits after the decimal point.
		Double	Double-precision floating-point data is a type of floating-point data, which is more precise than float, and stores 15/16 digits after the decimal point.
	Type B modifier keywords (4)	Short	Modify int and short integer data. The modified int can be omitted.
		Long	Modify int and long integer data. The modified int can be omitted.
		Signed	Modify integer data. It is a signed data type.
		Unsigned	The unsigned data type that modifies integer data.
	C complex type keywords (5)	Struct	Struct declaration.
		Union	Shared object declaration.
		Enum	Enumeration declaration.
		Typedef	Declared type alias.
		Sizeof	Get the size of a specific type or a specific type of variable.
	D storage-level keywords (6)	Auto	Automatically assigned and released by the compiler. Usually allocated on the stack.
		Static	Static variables are specified and allocated in the static variable area. When modifying a function, the function scope is specified inside the file.
		Register	It is recommended that the compiler store the variables in registers or modify the function parameters. It is recommended that the compiler PASS Parameters through registers instead of stacks.
		Extern	Specify the corresponding variable as an external variable, which is defined in another target file. It can be considered as an agreement declared by another file.
		Const	Used Together with volatile as the "cv feature", the specified variable cannot be changed by the current thread/process (but may be changed by the system or other threads/processes)
		Volatile	In combination with const, the value of a specified variable may be changed by the system or other processes/threads, forcing the compiler to obtain the value of the variable from the memory each time.
Category 2: Process Control keywords	A jump structure (4)	Return	Used in the function body to return a specific value (or void value, that is, no return value ).
		Continue	End the current cycle and start the next cycle.
		Break	Jump out of the current loop or switch structure.
		Goto	An unconditional jump statement.
	B branch structure (5)	If	Condition Statement.
		Else	The Condition Statement denies the branch (used with if ).
		Switch	Switch Statement (multi-branch Statement ).
		Case	The branch flag in the switch statement.
		Default	"Other" in the switch statement. Optional.
	C Cycle Structure (3)	For	For loop structure, the execution sequence of for (1; 2; 3) 4; is 1-> 2-> 4-> 3-> 2... loop, where 2 is the cycle condition.
		Do	Do Loop Structure, do 1 while (2); the execution order is 1-> 2-> 1... loop, 2 is the loop condition.
		While	While loop structure, while (1) 2; execution order is 1-> 2-> 1... loop. 1 is a loop condition. If the expression of the loop condition is true, the loop continues. If the expression is false, the loop jumps out.

 

 

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