Identifiers and Keywords

Identifiers and Keywords 

Identifiers are names given to various program elements ,such as variable, functions and array .

Identifiers consist of letters and digits in any order ,expect that the first character must be a letter.

The _ (underscore symbol)  can also be included .

An identifier may also begin with an underscore.

The Following names are examples of valid identifiers .

·      X

·      Y12

·      Sum1

·      area

·      a

·      _temperature

·      sum_2

·      Name

·      TABLE

·      Tax_rate

There are certain reserved words called Keywords .

There are 32 keywords in C.

Keywords have standard predefined meaning in c.

They cannot be used as user defined keywords.

The following are the 32 keywords in C.

auto

static

extern

register

char

int

float

double

long

short

signed

unsigned

const

void

enum

sizeof

if

else

do

while

for

switch

break

continue

union

struct

return

typedef

case

volatile

goto

default

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