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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_isxdigit.htm below:

C++ Locale Library - isxdigit

It checks if character is hexadecimal digit.

Following is the declaration for std::isxdigit.

int isxdigit ( int c );

int isxdigit ( int c );

c − Character to be checked, casted to an int, or EOF.

It returns a value different from zero.

No-throw guarantee − this function never throws exceptions.

In below example for std::isxdigit.

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
int main () {
   char str[]="ffff";
   long int number;
   if (isxdigit(str[0])) {
      number = strtol (str,NULL,16);
      printf ("The hexadecimal number %lx is %ld.\n",number,number);
   }
   return 0;
}

The sample output should be like this −

The hexadecimal number ffff is 65535.

locale.htm

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