C++ Wcslen() Function

#include<iostream>
#include<cwchar>
using namespace std;
int main()
{
    wchar_t ar[30];
    int x;

    cout << "Enter Your First Name : ";
    wcin >> ar;
    cout << endl;

    x = wcslen(ar);

    cout << "Length of Wide Character :: " << x << endl;

    return 0;
}