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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
#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
#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;
}Output
If we run the above code it will generate the following output −
The hexadecimal number ffff is 65535.
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