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. .

auto: The compiler defaults to auto when declaring automatic variables

int: Declare integer variables

double: Declare double precision variables

long: Declare long integer variable

char: Declare character variable

float: Declare floating point variable

short: Declare short integer variable

signed: Declare signed type variables

unsigned: Declare unsigned type variables

struct: Declare structure variables

union: Declare union (union data) variables

enum: declare enumeration variables

static: declare static variables

switch: used for switch statements

case: branch of switch statements

default : The "default" branch in the switch statement

break: Jump out of the current loop

register: Declare a register variable

const: Declare a read-only variable (constant variable)

volatile: Indicates that variables may be implicitly changed during program execution

typedef: alias the data type

extern: declares that variables are referenced from other files

return: subroutine return statement (parameters are optional)

void: declare that the function has no return value or no parameters, declare a null type pointer

continue: end the current loop And start the next cycle

do: the loop body of the loop statement

while: the loop condition of the loop statement

if: conditional statement

else: Negative branch of conditional statement

for: loop statement

goto: unconditional jump statement

sizeof: Calculate the size of the memory space occupied by the object

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