ctype.h ये header file character पर नियंत्रण रखने के लिए बनाया गया है |

Library Functions	Description
isalnum()	ये character alphanumeric है या नहीं ये check किया जाता है |
isalpha()	ये character alphabetic है या नहीं ये check किया जाता है |
iscntrl()	ये character control character है या नहीं ये check किया जाता है |
isdigit()	ये character digit है या नहीं ये check किया जाता है |
isgraph()	ये character graphical character है या नहीं ये check किया जाता है |
islower()	ये character lowercase है या नहीं ये check किया जाता है |
ispunct()	ये character puctuationn है या नहीं ये check किया जाता है |
isspace()	ये character space है या नहीं ये check किया जाता है |
isupper()	ये character uppercase है या नहीं ये check किया जाता है |
isxdigit()	ये character hexadecimal है या नहीं ये check किया जाता है |
tolower()	ये character uppercase से lowercase में convert किया जाता है |
toupper()	ये character lowercase से uppercase में convert किया जाता है |

 

 

isalnum : Alphanumeric

Source Code :

#include <stdio.h>
#include <ctype.h>

int main(){

char i;

i = '1';
if(isalnum(i)){
    printf("%c is alphanumeric.\n", i);
}else{
    printf("%c is not alphanumeric.\n", i);
}

i = 'H';
if(isalnum(i)){
    printf("%c is alphanumeric.\n", i);
}else{
    printf("%c is not alphanumeric.\n", i);
}

i = '$';
if(isalnum(i)){
    printf("%c is alphanumeric.\n", i);
}else{
    printf("%c is not alphanumeric.\n", i);
}
return 0;
}

Output :

1 is alphanumeric.
H is alphanumeric.
$ is not alphanumeric.

isalpha : Alphanumeric

Source Code :

#include <stdio.h>
#include <ctype.h>

int main(){

char i;

i = '1';
if(isalpha(i)){
    printf("%c is alphabetic.\n", i);
}else{
    printf("%c is not alphabetic.\n", i);
}

i = 'H';
if(isalpha(i)){
    printf("%c is alphabetic.\n", i);
}else{
    printf("%c is not alphabetic.\n", i);
}

i = '$';
if(isalpha(i)){
    printf("%c is alphabetic.\n", i);
}else{
    printf("%c is not alphabetic.\n", i);
}

return 0;
}

Output :

1 is not alphabetic.
H is alphabetic.
$ is not alphabetic.

iscntrl : Alphanumeric

Source Code :

#include <stdio.h>
#include <ctype.h>

int main(){

char i;

i = '1';
if(iscntrl(i)){
    printf("%c is control character.\n", i);
}else{
    printf("%c is not control character.\n", i);
}

i = 'H';
if(iscntrl(i)){
    printf("%c is control character.\n", i);
}else{
    printf("%c is not control character.\n", i);
}

i = '$';
if(iscntrl(i)){
    printf("%c is control character.\n", i);
}else{
    printf("%c is not control character.\n", i);
}

i = '\t';
if(iscntrl(i)){
    printf("%c is control character.\n", i);
}else{
    printf("%c is not control character.\n", i);
}
return 0;
}

Output :

1 is not control character.
H is not control character.
$ is not control character.
         is control character.

isdigit : Alphanumeric

Source Code :

#include <stdio.h>
#include <ctype.h>

int main(){

char i;

i = '1';
if(isdigit(i)){
    printf("%c is digit.\n", i);
}else{
    printf("%c is not digit.\n", i);
}

i = 'H';
if(isdigit(i)){
    printf("%c is digit.\n", i);
}else{
    printf("%c is not digit.\n", i);
}

i = '$';
if(isdigit(i)){
    printf("%c is digit.\n", i);
}else{
    printf("%c is not digit.\n", i);
}
return 0;
}

Output :

1 is digit.
H is not digit.
$ is not digit.

isgraph : Alphanumeric

Source Code :

#include <stdio.h>
#include <ctype.h>

int main(){

char i;

i = '1';
if(isgraph(i)){
    printf("%c is graphical character.\n", i);
}else{
    printf("%c is not graphical character.\n", i);
}

i = 'H';
if(isgraph(i)){
    printf("%c is graphical character.\n", i);
}else{
    printf("%c is not graphical character.\n", i);
}

i = '$';
if(isgraph(i)){
    printf("%c is graphical character.\n", i);
}else{
    printf("%c is not graphical character.\n", i);
}

i = '\t';
if(isgraph(i)){
    printf("%c is graphical character.\n", i);
}else{
    printf("%c is not graphical character.\n", i);
}
return 0;
}

Output :

1 is graphical character.
H is graphical character.
$ is graphical character.
         is not graphical character.

islower : Alphanumeric

Source Code :

#include <stdio.h>
#include <ctype.h>

int main(){

char i;

i = '1';
if(islower(i)){
    printf("%c is lowercase character.\n", i);
}else{
    printf("%c is not lowercase character.\n", i);
}

i = 'H';
if(islower(i)){
    printf("%c is lowercase character.\n", i);
}else{
    printf("%c is not lowercase character.\n", i);
}

i = 'h';
if(islower(i)){
    printf("%c is lowercase character.\n", i);
}else{
    printf("%c is not lowercase character.\n", i);
}

i = '$';
if(islower(i)){
    printf("%c is lowercase character.\n", i);
}else{
    printf("%c is not lowercase character.\n", i);
}
return 0;
}

Output :

1 is not lowercase character.
H is not lowercase character.
h is lowercase character.
$ is not lowercase character.

ispunct : Alphanumeric

Source Code :

#include <stdio.h>
#include <ctype.h>

int main(){

char i;

i = '1';
if(ispunct(i)){
    printf("%c is punctuation.\n", i);
}else{
    printf("%c is not punctuation.\n", i);
}

i = 'H';
if(ispunct(i)){
    printf("%c is punctuation.\n", i);
}else{
    printf("%c is not punctuation.\n", i);
}

i = '"';
if(ispunct(i)){
    printf("%c is punctuation.\n", i);
}else{
    printf("%c is not punctuation.\n", i);
}

i = '$';
if(ispunct(i)){
    printf("%c is punctuation.\n", i);
}else{
    printf("%c is not punctuation.\n", i);
}
return 0;
}

Output :

1 is not punctuation.
H is not punctuation.
" is punctuation.
$ is punctuation.

isspace : Alphanumeric

Source Code :

#include <stdio.h>
#include <ctype.h>

int main(){

char i;

i = '1';
if(isspace(i)){
    printf("%c is space.\n", i);
}else{
    printf("%c is not space.\n", i);
}

i = 'H';
if(isspace(i)){
    printf("%c is space.\n", i);
}else{
    printf("%c is not space.\n", i);
}

i = ' ';
if(isspace(i)){
    printf("%c is space.\n", i);
}else{
    printf("%c is not space.\n", i);
}

i = '$';
if(isspace(i)){
    printf("%c is space.\n", i);
}else{
    printf("%c is not space.\n", i);
}
return 0;
}

Output :

1 is not space.
H is not space.
  is space.
$ is not space.

isupper : Alphanumeric

Source Code :

#include <stdio.h>
#include <ctype.h>

int main(){

char i;

i = '1';
if(isupper(i)){
    printf("%c is uppercase character.\n", i);
}else{
    printf("%c is not uppercase character.\n", i);
}

i = 'H';
if(isupper(i)){
    printf("%c is uppercase character.\n", i);
}else{
    printf("%c is not uppercase character.\n", i);
}

i = 'h';
if(isupper(i)){
    printf("%c is uppercase character.\n", i);
}else{
    printf("%c is not uppercase character.\n", i);
}
return 0;
}

Output :

1 is not uppercase character.
H is uppercase character.
h is not uppercase character.

isxdigit : Alphanumeric

Source Code :

#include <stdio.h>
#include <ctype.h>

int main(){

char i;

i = '1';
if(isxdigit(i)){
    printf("%c is hexadecimal.\n", i);
}else{
    printf("%c is not hexadecimal.\n", i);
}

i = '9f';
if(isxdigit(i)){
    printf("%c is hexadecimal.\n", i);
}else{
    printf("%c is not hexadecimal.\n", i);
}

i = 'F';
if(isxdigit(i)){
    printf("%c is hexadecimal.\n", i);
}else{
    printf("%c is not hexadecimal.\n", i);
}

i = 'h';
if(isxdigit(i)){
    printf("%c is hexadecimal.\n", i);
}else{
    printf("%c is not hexadecimal.\n", i);
}
return 0;
}

Output :

1 is hexadecimal.
f is hexadecimal.
F is hexadecimal.
h is not hexadecimal.

tolower : Alphanumeric

Source Code :

#include <stdio.h>
#include <ctype.h>

int main(){

char i, lower;

i = '1';
lower = tolower(i);
    printf("Converted in Lowercase : %c\n", lower);

i = 'H';
lower = tolower(i);
    printf("Converted in Lowercase : %c\n", lower);

i = 'h';
lower = tolower(i);
    printf("Converted in Lowercase : %c", lower);

return 0;
}

Output :

Converted in Lowercase : 1
Converted in Lowercase : h
Converted in Lowercase : h

toupper : Alphanumeric

Source Code :

#include <stdio.h>
#include <ctype.h>

int main(){

char i, upper;

i = '1';
upper = toupper(i);
    printf("Converted in uppercase : %c\n", upper);

i = 'H';
upper = toupper(i);
    printf("Converted in uppercase : %c\n", upper);

i = 'h';
upper = toupper(i);
    printf("Converted in uppercase : %c", upper);

return 0;
}

Output :

Converted in uppercase : 1
Converted in uppercase : H
Converted in uppercase : H