#include <stdio.h>
main()
{
   int itemno, sold, smallestno, largestno;
   float price, money, largest, smallest;

   largest = smallest = 0;
   printf("\nEnter item number (0 to end): ");
   scanf("%d", &itemno);
   if(itemno != 0)
   {
      printf("Enter unit price: ");
      scanf("%f", &price);
      printf("Enter quantity sold: ");
      scanf("%d", &sold);
      money = sold * price;
      largest = money;
      smallest = money;
      largestno = itemno;
      smallestno = itemno;
      while (itemno != 0)
      {
         printf("\nEnter item number (0 to end): ");
         scanf("%d", &itemno);
         if(itemno != 0)
         {
            printf("Enter unit price: ");
            scanf("%f", &price);
            printf("Enter quantity sold: ");
            scanf("%d", &sold);
            money = sold * price;
            if (money >= largest)
            {
               largest = money;
               largestno = itemno;
            }
            if (money <= smallest)
            {
               smallest = money;
               smallestno = itemno;
            }
         }
      }
   }
   printf("\nItem number %d sold most, and item number %d sold "
           "least.", largestno, smallestno);
}