PHONE NUMBER LENGTH CORRECT OR NOT IN C++

#include <iostream>
#include <string.h>
using namespace std;

int main ()
{
    char num [1000];

     cout<<"PLEASE ENTER YOUR PHONE NUMBER : ";
     cin>>num;

     if (strlen (num) == 11)
     {
         cout<<num<<" THE NUMBER IS CORRECT"<<endl;
     }
     else
     {
         cout<<num<<" THE NUMBER IS NOT CORRECT"<<endl;
     }

    return 0;
}

OUTPUT