iswspace() function in C++ STL

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

iswspace() function is an inbuilt function in C++ which is defined in header file. The function checks whether the passed wide character is a white space character or not.This function is a wide character equivalent of isspace(), which means it works the same as isspace() the difference is it supports a wide character. The function checks the if argument passed is a white space (‘ ‘) then return a non-zero integer value(true), else return zero(false)

Syntax

int iswspace(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 = '.';
   wint_t b = ' ';
   wint_t c = '1';
   iswspace(a)?cout<<"\nIts white space character":cout<<"\nNot white space character";
   iswspace(b)?cout<<"\nIts white space character":cout<<"\nNot white space character";
   iswspace(c)?cout<<"\nIts white space character":cout<<"\nNot white space character";
}

Output

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

Not white space character
Its white space character
Not white space character

Example

 Live Demo

#include <iostream>
#include <cwctype>
using namespace std;
int main () {
   int i, count;
   wchar_t s[] = L"I am visiting tutorials point";
   count = i = 0;
   while (s[i]) {
      if(iswspace(s[i]))
         count++;
      i++;
   }
   cout<<"There are "<<count <<" white space characters.\n";
   return 0;
}

Output

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

There are 4 white space characters.