#include <stdio.h>
typedef struct
{
  int BarCode;
  float UnitPrice;
  int Quantity;
  char Description[40];
} RECORD;

RECORD *DataBase;
int Items;
  
RECORD *ReadInventory(items)
int *items;
  
{FILE *DataFile;
 RECORD *DB,*p;
 int Total,TotalQuantity,i;
 if ((DataFile=fopen("DATA","r"))== NULL) {
  perror("DATA");
  exit(1); } 
 if (fread(items,sizeof(int),1,DataFile) > 0)
  printf("There are %d items in the Data Base \n",*items);
 DB=malloc(sizeof(RECORD)* *items);
 fread(DB,sizeof(RECORD),*items,DataFile);
 fread(&TotalQuantity,sizeof(int),1,DataFile);
 fclose(DataFile);
 Total=0;
 p=DB;
 for (i=0;i< *items;i++){
  Total=Total+ *p.Quantity;
  p++;
 }
 if (Total != TotalQuantity)
  printf("Total Quantity counted, %d, doesn't match file spec. %d\n",Total,TotalQuantity);
 else
  printf("Total Quantity is %d\n",TotalQuantity);
 return(DB);
}

int EchoInventory(DB,Items)
RECORD *DB;
int Items;
{int i;
 printf("There are %d items in the inventory \n",Items);
 for (i=0;i<Items;i++){
  printf("%d %f %d %s \n",*DB.BarCode,*DB.UnitPrice,*DB.Quantity,*DB.Description);
  DB++;
}
 return(0);
}

main()
{DataBase=ReadInventory(&Items);
 EchoInventory(DataBase,Items);
}