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iswdigit() function in C++ STL
In C++ STL, iswdigit() function is a built-in function that is used to check if the given wide character is a decimal digit character or some other character. This function is present in a cwctype header file in C/C++.
What are the decimal digit characters?
Decimal digit character are the numeric values that starts from 0 i.e. 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 .
Syntax of iswcntrl() function is as follows
int iswdigit() (wint_t c)
Parameters − c is a wide character to be checked, casted to a wint_t, or WEOF where wint_t is an integral type.
Return Value − A value different from zero (i.e., true) if indeed c is a decimal digit and value zero (i.e., false) otherwise.
Approach used in the below program is as follows
Input the string in a variable let’s say str[] of type string
Call the function iswdigit() to check whether the given wide character is a decimal digit or not
Print the result
Example-1
#include <cwctype>
#include <iostream>
using namespace std;
int main(){
wchar_t c_1 = '2';
wchar_t c_2 = '*';
// Function to check if the character
// is a digit or not
if (iswdigit(c_1))
wcout << c_1 << " is a character ";
else
wcout << c_1 << " is a digit ";
wcout << endl;
if (iswdigit(c_2))
wcout << c_2 << " is a character ";
else
wcout << c_2 << " is a digit ";
return 0;
}Output
If we run the above code it will generate the following output −
2 is a digit * is a character
Example-2
#include <stdio.h>
#include <wchar.h>
#include <wctype.h>
int main (){
wchar_t str[] = L"1776ad";
long int year;
if (iswdigit(str[0])) {
year = wcstol (str,NULL,10);
wprintf (L"The year that followed %ld was %ld.\n",year,year+1);
}
return 0;
}Output
If we run the above code it will generate the following output −
The year 1777 followed 1776
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