C Language 32 Keywords

There are 32 keywords in C, according to the function of the keyword, it can be divided into four categories: data type keyword, control statement keyword, storage type keyword and other keywords.

First, data type keywords (12):  

(1) Char: Declaring a character variable or function

(2) Double: declares a double-precision variable or function

(3) Enum: declaring enum type

(4) Float: Declare a floating-point variable or function

(5) Int: Declaring an integer variable or function

(6) Long: Declares a long integer variable or function

(7) Short: Declare a variable or function

(8) Signed: Declaring a signed type variable or function

(9) struct: declares struct-body variable or function

Union: declaring Union data types

(one) unsigned: declaring an unsigned type variable or function

void: Declares a function with no return value or no argument, declares an untyped pointer

Second, the control statement keywords (12):

A, the Loop statement:

(1) For: a looping statement

(2) Do: loop body of Loop statement

(3) While: loop condition of the loop statement

(4) Break: Jump out of the current loop

(5) Continue: End the current cycle and start the next cycle

B, conditional statement:

(1) if: Conditional statement

(2) ELSE: Conditional statement Negation branch (with IF)

(3) Goto: Unconditional Jump Statement

C, switch statements:

(1) Switch: for switch statements

(2) Case: switch Statement Branch

(3) Default: "Other" branch in the switch statement

D, return statement:

(1) Return: Subroutine Return statement (can take parameters, also see without parameters)

Three, storage type keywords (4):

(1) Auto: Declares that automatic variables are generally not used

(2) extern: Declaring a variable is declaring it in another file (and can also be seen as a reference variable)

(3) Register: Declare the variable of the accumulation device

(4) Static: Declaring a static variable

Iv. other Keywords (4):

(1) Const: Declaring read-only variables

(2) sizeof: Calculate data type length

(3) typedef: Used to alias data types

(4) Volatile: Explanatory variables can be implicitly changed in program execution

C Language 32 Keywords