APPENDING DATA TO AN EXISTING FILE IN C

/*-------20 APPENDING DATA TO AN EXISTING FILE -----*/

Appending data to an existing file in C

#include <stdio.h>
#include <conio.h>
struct invent_record
{
char name[10];
int number;
float price;
int quantity;
};
void main()
{
struct invent_record item;
char filename[10];
int response;
FILE *fp;
long n;
void append (struct invent_record *x, FILE *y);
clrscr();
printf("Type filename:");
scanf("%s", filename);
fp = fopen(filename, "a+");
do
{
append(&item, fp);
printf("\nItem %s appended.\n",item.name);
printf("\nDo you want to add another item\
(1 for YES /0 for NO)?");
scanf("%d", &response);
} while (response == 1);
fseek(fp,0,SEEK_END); /*Set the file pointer at the end of file*/
n=ftell(fp); /* Position of last character */
fclose(fp);
fp = fopen(filename, "r");
while(ftell(fp) < n)
{
fscanf(fp,"%s %d %f %d",
item.name, &item.number, &item.price, &item.quantity);
fprintf(stdout,"%-8s %7d %8.2f %8d\n",
item.name, item.number, item.price, item.quantity);
}
fclose(fp);
getch();
}
void append(struct invent_record *product, FILE *ptr)
{
printf("Item name:");
scanf("%s", product->name);
printf("Item number:");
scanf("%d", &product->number);
printf("Item price:");
scanf("%f", &product->price);
printf("Quantity:");
scanf("%d", &product->quantity);
fprintf(ptr, "%s %d %.2f %d",
product->name,
product->number,
product->price,
product->quantity);
}

Output