What types of keywords are there in C language?

#There are 32 keywords in C language. According to the function of keywords, they can be divided into data type keywords, control statement keywords, storage type keywords and others. Four categories of keywords.

Data type keywords (12):

(1) char: declare character variable or function

(2) double: declare double precision variable Or function

(3) enum: declare enumeration type

(4) float: declare floating point variable or function

(5) int: declare integer variable Or function

(6) long: declare a long integer variable or function

(7) short: declare a short integer variable or function

(8) signed: declare Signed type variables or functions

(9) struct: declare structure variables or functions

(10) union: declare union (union) data type

(11 ) unsigned: declare an unsigned type variable or function

(12) void: declare a function with no return value or parameters, declare an untyped pointer (basically these three functions)

Control Statement keywords (12):

A loop statement

(1) for: a loop statement (can be understood but not expressed)

(2) do: The loop body of the loop statement

(3) while: The loop condition of the loop statement

(4) break: Jump out of the current loop

(5) continue: End the current loop, Start the next round of loop

B conditional statement

(1)if: conditional statement

(2)else: conditional statement negation branch (used in conjunction with if)

(3)goto: unconditional jump statement

C switch statement

(1)switch: used for switch statement

(2)case: switch statement branch

(3)default: the "other" branch in the switch statement D return statement return: subroutine return statement (can take parameters or not)

Storage type keyword ( 4)

(1)auto: It is generally not used to declare automatic variables

(2)extern: The declared variable is declared in other files (can also be regarded as a reference variable)

(3)register: declare accumulator variables (4)static: declare static variables

Other keywords (4):

(1)const: declare read-only variables

(2)sizeof: Calculate the length of the data type

(3)typedef: Used to alias the data type (of course there are other functions

(4)volatile: Description variables can be changed implicitly during program execution

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