programa que haga un ping y diga hola si el pin funciona

#include <iostream>
using namespace std;
int main()
{
  char hostname[100];
  cout << "enter host name" << endl;
  cin.getline(hostname, 100);
  if(ping(hostname))
    cout << "ping ok" << endl;
  else
    cout << "ping not ok" << endl;
  return 0;
}