Details of C language keywords

  The C language has a total of 32 keywords, as follows:

auto: declares an automatic variable

short: declares a short integer variable or function

int: declares an integer variable or function

long: declares a long integer variable or function

float: declares a floating point type Variable or function

double: declare double-precision variable or function

char: declare character variable or function

struct: declare structure variable or function

union: declare common data type

enum: declare enumeration type

typedef: used to alias data type

const: Declare a read-only variable

unsigned: Declare an unsigned type variable or function

signed: Declare a signed type variable or function

extern: Declare a variable in another file Declare

register http://www.cppentry.com Programming Development Programmer's Introduction: Declare a Register Variable

static: declare a static variable

volatile: indicate that the variable can be implicitly changed during program execution

void: declare that the function has no return value or no parameters, declares an untyped pointer

if: conditional statement

else: conditional statement negates the branch (used in conjunction with if)

switch: used for switch statement case: switch statement branch

for: a kind of loop statement

do: loop body of loop statement

while : the loop condition of the loop statement

goto: unconditional jump statement

continue: end the current loop, start the next cycle

break: jump out of the current loop

default: switch the "other" branch in the statement

sizeof: calculate the length of the data type

return: return the subroutine Statement (with or without parameters) loop condition