iswxdigit() function in C++ STL

In this article we are going to discuss the iswxdigit() function in C++, its syntax, working and its return values.

iswxdigit() function is an inbuilt function in C++ which is defined in header file. The function checks whether the passed wide character is a hexadecimal character or not. The function checks the if argument passed is hexadecimal character then return a non-zero integer value(true), else return zero(false).

A hexadecimal character is any character which is among the following −

0 1 2 3 4 5 6 7 8 9 A B C D E F

Syntax

int iswxdigit(wint_t ch);

The function accepts only one parameter, i.e. a wide character which is to be checked. The argument is casted in wint_t or WEOF.

wint_t stores an integral type of data.

Return value

The function returns an integer value, which can be either 0 (in case of false) or any non-zero value(in case of true).

Example

Live Demo

#include <iostream>
#include <cwctype>
using namespace std;
int main() {
   wint_t a = 'A';
   wint_t b = '9';
   wint_t c = 'g';
   iswxdigit(a)?cout<<"\nIts hexadecimal character":cout<<"\nNot hexadecimal character";
   iswxdigit(b)?cout<<"\nIts hexadecimal character":cout<<"\nNot hexadecimal character";
   iswxdigit(c)?cout<<"\nIts hexadecimal character":cout<<"\nNot hexadecimal character";
}

Output

If we run the above code it will generate the following output −

Its hexadecimal character
Its hexadecimal character
Not hexadecimal character

Example

Live Demo

#include <stdio.h>
#include <cwchar>
#include <cwctype>
using namespace std;
int main () {
   wchar_t s[] = L"ffff";
   long int num;
   if (iswxdigit(s[0])) {
      num = wcstol (s,NULL,16);
      wprintf (L"The hexadecimal number %lx is %ld.\n",num,num);
   }
   return 0;
}