C++ iswspace()

The iswspace() function in C++ checks if the given wide character is a wide whitespace character or not.

The iswspace() function is defined in <cwctype> header file.

iswspace() prototype

int iswspace(wint_t ch);

The iswspace() function checks if ch is a whitespace character or not. By default, the the following characters are whitespace characters:

  • space (0x20, ' ')
  • form feed (0x0c, '\f')
  • line feed (0x0a, '\n')
  • carriage return (0x0d, '\r')
  • horizontal tab (0x09, '\t')
  • vertical tab (0x0b, '\v')

iswspace() Parameters

  • ch: The wide character to check.

iswspace() Return value

  • The iswspace() function returns non zero value if ch is a whitespace character.
  • It returns zero if ch is not a whitespace character.

Example: How iswspace() function works?

#include <cwctype>
#include <iostream>
#include <cwchar>
#include <clocale>
using namespace std;

int main()
{
	setlocale(LC_ALL, "en_US.UTF-8");
	wchar_t str[] = L"<html>\n<head>\n\t<title>\u0939\u0947\u0932\u094b</title>\n</head>\n</html>";

	wcout << L"Before removing whitespace characters" << endl;
	wcout << str << endl << endl;
	wcout << L"After removing whitespace characters" << endl;

	for (int i=0; i<wcslen(str); i++)
	{
		if (!iswspace(str[i]))
			wcout << str[i];
	}
	
	return 0;
}

When you run the program, the output will be:

Before removing whitespace characters
<html>
<head>
<title>हेलो</title>
</head>
</html>
After removing whitespace characters
<html><head><title>हेलो</title></head></html>