Operation on mixed data types

Program 62) Write a program to open a file named INVENTORY and store in it the following data:
  item name            Number                 Price          Quantity
  AAA-1                    111                        17.50          115
  BBB-2                    125                        36.00            75
       C-3                    247                        31.75           104
Extend the program to read this data from the file INVENTORY and display table with  the value of each item.
This program shown below. The filename INVENTORY is supplied through the keyboard. Data is read using the function fscanf from the file stdin, which refers to the terminal and it is then written to the file that is being pointed to by the file pointer fp. Remember that the file pointer fp points to the file INVENTORY.
After closing the file INVENTORY, it is again reopened for reading. The data from the file, along with the item values are written to the file stdout, which refers to the screen. While reading from a file, care should be taken to use the same format soecifications with which the contents have been written to the file....e

                                   PROGRAM

#include <stdio.h>
main ( )
 {
       FILE *fp ;
       int number, quantity, i ;
       float price, value ;
       char item [10], filename [10] ;

      printf ("Input file name\n") ;
      scanf("%s", filename) ;
      fp = fopen (filename, "w") ;
      printf ("Item name Number Price Quantity\n") ;
      for (i = 1; i <= 3; i++)
      {
           fscanf (stdin, "%s %d %f %d",
                                   item, &number, &price, &Quantity) ;
          fprintf (fp, "%s %d %.2f %d",
                                   item, number, price, quantity) ;
     }
     fclose (fp) ;
     fprintf (stdout, "\n\n") ;

     fp = fopen (filename, "r") ;

   printf ("Item name Number  Price   Quantity  Value\n")
   for (i = 1; i <=3; i++)
   {
        fscanf (fp, "%s %d %f d", item, &number, &price,
                                                             &quantity) ;
        value = price * quantity ;
        fprintf (stdout, "%-8s %7d %8.2f %8d %11.2f\n",
                    item, number, price, quantity, value) ;
  }
  fclose (fp) ;
}

Output:        Input file name
                    INVENTORY
                    Input inventory data

                   Item name    Number       Price        Quantity
                   AAA-1              111           17.50         115
                   BBB-2              125            36.00          75
                   C-3                   247            31.75         104

              Item name    Number   Price   Quantity  Value
              AAA-1           111          17.50       115      2012.50
              BBB-2           125          36.00         75      2700.00
              C-3                247          31.75       104      3302.00