// File: Makedb.c
// Create a binary encoded file example
// Each record has four fields, as described in the declaration of ItemRec below.

#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>

typedef struct           /* The Data Structure for one item of the inven-   */
{ int BarCode;           /* tory.                                           */
  float UnitPrice;
  int Quantity;
  char Description[40];
} ItemRec;		 // This is a C-style struct declaration 

main()
{ItemRec Product;
 FILE *fp;
 int Items,total,count;
 char S[20];
 fp=fopen("DATA","w+b");
 printf("How Many Items >");
 scanf("%d",&Items);
 fwrite(&Items,sizeof(int),1,fp);
 total=0;
 // Add one record per iteration
 for (count=0;count <= (Items-1);count++) {
  // Input fields	 
  printf("BarCode (int)>");
  scanf("%s",S);
  Product.BarCode=atoi(S);
  printf("Price  (real)>");
  scanf("%s",S);
  Product.UnitPrice=atof(S);
  printf("Quantity (int)>");
  scanf("%s",S);
  Product.Quantity=atoi(S);
  printf("Description  >");
  scanf("%s",Product.Description);
  total+=Product.Quantity;
  // Write in binary form
  fwrite(&Product,sizeof(ItemRec),1,fp);
 }
 // Write total items at end of binary file
 fwrite(&total,sizeof(int),1,fp);
 fclose(fp);
}