#include <iostream>
#include <limits>
 
using namespace std;
 
int main()
{
  int num;
 
  // Get valid input
  do
  { 
    if (cin.fail())
    {
      // Clear error state and flush any garbage input
      cin.clear();
      cin.ignore(numeric_limits<streamsize>::max(), '\n');
    }
 
    cout << "Please enter a number: ";
    cin >> num;
 
  } while (cin.fail());
 
  // Echo back what we heard
  cout << "You entered: " << num << "\n";
 
  cin.get();
}

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