/* dowhile.cpp */
#include <stdio.h>
#include <iostream.h>
#include <string>
using namespace std;

int main(void)
{
  int luku;  string s;
  do {
    cout << "Anna luku v„lilt„ [0-20]>";
    getline(cin,s);
  } while ( ( sscanf(s.c_str(),"%d",&luku) < 1 ) || ( luku < 0 ) || ( 20 < luku ) );
  cout << "Annoit luvun " << luku << endl;
  return 0;
}