// A simple program to convert a number of quarts to liters
// Version 3:  declaring local variables just as needed
 
#include <iostream.h>
 
int main (void)
{  cout << "Enter volume in quarts: " ;

   int quarts;                                  /* declaring quarts just  
                                                   before its use */
   cin >> quarts;

   // if value of quarts is invalid, ask user again
   while (quarts <= 0) {
     cout << "Value of quarts must be positive; enter value again: " ;
     cin >> quarts;
   }
 
   double liters = quarts / 1.056710 ;          /* declaring and initializing
                                                   liters just as needed */ 
   cout << quarts << " quarts = "
        << liters << " liters" << endl;

   return 0;
}