iswalpha() function in C++ STL

iswalpha() function in C++ STL is used to check whether the given wide character is an alphabet or not.

Algorithm

Begin
   Initializes the strings.
   Call function iswalpha(str) to check whether it contains alphabet or not.
   If it contains alphabet, then value will be returned otherwise zero will be returned.
End

Example Code

#include <cwctype>
#include <iostream>
#include <cwchar>
#include <clocale>
using namespace std;
int main() {
   setlocale(LC_ALL, "ab1234");
   wchar_t s[] = L"a%$^^&)";
   bool flag = 0;
   for (int i=0; i<wcslen(s); i++) {
      if (iswalpha(s[i])) {
         flag = 1;
         break;
      }
   }
   if (flag)
      wcout << s << L" contains alphabets";
   else
      wcout << s << L" doesn't contain alphabets";
   return 0;
}