// Determine if month is invalid
#include <iostream>
using namespace std;
int main()
{ int month;
  cout<<"Enter the number of a month:";
  cin>>month;
  if (month < 1 || month > 12)
    cout<<month<<" is NOT a valid month.\n";
  else
    cout<<month<<" is a valid month.\n";
  return 0;
} // main