iswupper() function in C++ STL

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

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

Syntax

int iswupper(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 = 'A';
   wint_t b = 'a';
   wint_t c = 'B';
   iswupper(a)?cout<<"\nIts upper case character":cout<<"\nNot upper case character";
   iswupper(b)?cout<<"\nIts upper case character":cout<<"\nNot upper case character";
   iswupper(c)?cout<<"\nIts upper case character":cout<<"\nNot upper case character";
}

Output

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

Its upper case character
Not upper case character
Its upper case 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(iswupper(s[i]))
         count++;
      i++;
   }
   cout<<"There are "<<count <<" uppercase characters.\n";
   return 0;
}

Output

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

There are 11 uppercase characters.