How can I apply file handling in my program ?

[deanndeanne]

Hello !
I've been trying to apply file handling in my program but I can't seem to make it work..
My program is for a shoe inventory .. Here's my code..

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#include<dos.h>
#define MAX 5

struct x
{
int no_of_pair;
} size[2];

struct style
{int nos;
int price;
struct x size[2];
} shoe[2];

struct stak
{ int no;
 struct style shoe[2];
} stock[MAX];


int a=0;

void DISPLAY(struct stak j[])
{clrscr();
int b,menu;

	for(b=0; b <= a; b++){
	j[b].no = b+1;
	 printf(" shoe\tshoe       size       no. of      price\n  no.   style\t \t      pairs\n\n");
	 printf("   %d     **************************************\n   ***   1    ***   12    **    %d    **    %d\n", j[b].no,j[b].shoe[0].size[0].no_of_pair,j[b].shoe[0].price);
	 printf("   ***        ***   13    **    %d\n",j[b].shoe[0].size[1].no_of_pair);
	 printf("   ***        ***   14    **    %d\n\n",j[b].shoe[0].size[2].no_of_pair);
	 printf("   ***   2    ***   12    **    %d    **    %d\n",j[b].shoe[1].size[0].no_of_pair,j[b].shoe[1].price);
	 printf("   ***        ***   13    **    %d\n",j[b].shoe[1].size[1].no_of_pair);
	 printf("   ***        ***   14    **    %d\t\n\n",j[b].shoe[1].size[2].no_of_pair);
	 printf("   ***   3    ***   12    **    %d    **    %d\n",j[b].shoe[2].size[0].no_of_pair,j[b].shoe[2].price);
	 printf("   ***        ***   13    **    %d\n",j[b].shoe[2].size[1].no_of_pair);
	 printf("   ***        ***   14    **    %d\n",j[b].shoe[2].size[2].no_of_pair);
	}
printf("\n\nreturn to menu??(Press 0 if yes and 1 if not)");
scanf("%d",&menu);
if(menu == 1)
	exit(0);
}

void ADD(struct stak k[])
{
	a+=1;

printf("\nEnter the no. of pairs for each size in each style .\n");
printf("\nStyle 1: \n 12\":\t");
scanf("%d",&k[a].shoe[0].size[0].no_of_pair);
printf("\n13\":\t");
scanf("%d",&k[a].shoe[0].size[1].no_of_pair);
printf("\n14\":\t");
scanf("%d",&k[a].shoe[0].size[2].no_of_pair);
printf("Enter the price for Style 1:\t");
scanf("%d",&k[a].shoe[0].price);
printf("\n\nStyle 2: \n 12\":\t");
scanf("%d",&k[a].shoe[1].size[0].no_of_pair);
printf("\n13\":\t");
scanf("%d",&k[a].shoe[1].size[1].no_of_pair);
printf("\n14\":\t");
scanf("%d",&k[a].shoe[1].size[2].no_of_pair);
printf("Enter the price for Style 2:\t");
scanf("%d",&k[a].shoe[1].price);
printf("\n\nStyle 3: \n 12\":\t");
scanf("%d",&k[a].shoe[2].size[0].no_of_pair);
printf("\n13\":\t");
scanf("%d",&k[a].shoe[2].size[1].no_of_pair);
printf("\n14\":\t");
scanf("%d",&k[a].shoe[2].size[2].no_of_pair);
printf("Enter the price for Style 3:\t");
scanf("%d",&k[a].shoe[2].price);
}


void EDIT(struct stak l[])
{
 int ans;
 int styles;
 int change, choice;
 int prize;

printf("What stock number do you want to edit?\n");
printf("Here are your choices : \n1. 1\t 2. 2\t 3. 3 \n");
scanf("%d",&ans);
if(ans==0)
printf("INvalid Stock no. !");

else
{ ans-=1;
if(ans>a)
	printf("NO STOCK NUMBER EXISTS!");

else
{printf("What styles would it be ?\n");
 printf("Here are your choices :\n1. 1\t 2. 2\t 3. 3 \n");
 printf("Enter your choice\n");
 scanf("%d",&styles);

	if(styles==0)
	printf("Invalid Style !");
	else { styles-=1;
		if(styles>2)
		printf("NO STYLE EXISTS !");

printf("What do you want to change?\n Here are the choices: \t1. Price \t 2. No. of Pairs");
scanf("%d",&change);

if(change==1)
{ printf("Enter the new price:\t");
  scanf("%d",&l[ans].shoe[styles].price);
}

else{
	if(change==2)
{ printf("What would be the shoe size ? 1. 12\" ?\t 2. 13\" ?\t 3. 14\"?\n");
 scanf("%d",&choice);
 printf("Enter the new no. of pairs:\t ");
 scanf("%d",&l[ans].shoe[styles].size[choice-1].no_of_pair);
}
}
}
}
}
}

main()
{
struct stak stock[MAX];
int sagot;
stock[0].shoe[0].price=1500;
stock[0].shoe[1].price=2500;
stock[0].shoe[2].price=3700;
stock[0].shoe[0].size[0].no_of_pair=5;
stock[0].shoe[0].size[1].no_of_pair=7;
stock[0].shoe[0].size[2].no_of_pair=10;
stock[0].shoe[1].size[0].no_of_pair=6;
stock[0].shoe[1].size[1].no_of_pair=8;
stock[0].shoe[1].size[2].no_of_pair=11;
stock[0].shoe[2].size[0].no_of_pair=7;
stock[0].shoe[2].size[1].no_of_pair=9;
stock[0].shoe[2].size[2].no_of_pair=12;

do{
clrscr();

gotoxy(27,2);
printf("SHOE INVENTORY\n\n");
printf("What do you want to do ?\n1.DISPLAY\n2.ADD\n3.EDIT\n4.EXIT");
scanf("%d",&sagot);

switch(sagot)
{
case 1: DISPLAY(stock);break;
case 2: ADD(stock); break;
case 3: EDIT(stock); break;
case 4: exit(0); break;
default : printf("Error!"); }
}
while(sagot!=4);
getch();
}

Thanks for the help !

[donbock]

Something about the output of this program must be wrong or you wouldn't have posted your question. It would help a lot if you described what is going wrong (compiler error, linker error, runtime error, wrong output, etc).