What are the keywords of C language?

#What are the keywords in C language?

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

1. Data type keywords (12):

(1) char: declare character variable or function

(2) double : Declaring a double precision variable or function

(3) enum : Declaring an enumeration type

(4) float : Declaring a floating point variable or function

(5) int : Declaring an integer variable or function

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

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

( 8) signed: declare a signed type variable or function

(9) struct: declare a structure variable or function

(10) union: declare a 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)

2. Control statement keywords (12):

A. Loop statement

(1) for: a loop statement

(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 and start the next cycle

B. Conditional statement

(1) if: conditional statement

(2) else: conditional statement negates the branch (Used with if)

(3) goto: unconditional jump statement

C. Switch statement

(1) switch: used for switch statement

(2) case: switch statement branch

(3)default: "other" branch in the switch statement

D. Return statement

return: subroutine return statement (Can take parameters or not)

3. Storage type keywords (4)

(1)auto: declare automatic variables Generally not used

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

(3)register: Declared register variable

(4)static: declare static variables

4. 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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