ATM on a system???

[lesrhac03]

I have an ATM program.. and as a project my prof. ask me to make an ATM in a system??? it is possible that my ATM will store username and password?? and it save all the transaction in a notepad?? anyone give me a reference where I get some codes to apply on my program.. and as a big help if anyone has already done with this?? please give me an example...

here's my very simple ATM program..

#include <stdio.h>
#include <conio.h>
double amount=10000;
double dep(double y)
{
double account;
account=amount+y;
return account;
}
double with(double x)
{
double account,y;
y=amount;
account=amount-x;
if(x>4000)
printf("The largest amount you can withdraw is 4000\n");
else if(x>amount)
printf("The smallest amount you can withdraw is 200\n");
else
amount=amount-x;
printf("&#37;lf",amount);
return 0;}
void main()
{
int i=0;
double x;
double y;
clrscr();
printf("\n*******MENU*********\n");
printf("1.Balance Enquiry\n");
printf("2.Withdraw\n");
printf("3.Deposit\n");
printf("4.Exit\n");
printf("Select an item from the menu: ");
scanf("%d",&i);
while(i<4)
{
switch(i)
{
case 1:printf("This is your balance amount: %f",amount);
break;
case 2:printf("How much would you like to withdraw?");
scanf("%lf",&y);
//amount = amount-y;
with(y);
//printf("This is your balance amount: %f",amount);
break;
case 3:printf("How much amount do want to deposit?\n");
scanf("%lf",&x);
amount = amount+x;
printf("This is your balance amount: %f",amount);
break;
}
printf("\n*********MENU*********...\n");
printf("1.Balance Enquiry\n");
printf("2.Withdraw\n");
printf("3.Deposit\n");
printf("4.Exit\n");
printf("If you are a first time user please deposit some amount for balance enquiry.\n");
printf("Select an item from the menu: ");
scanf("%d",&i);
}
getch();
}

This program is 100% working..
but...
I don't know how to start...
this is our last project, and this is the hardiest program for me..

[matsp]

Yes, of course it's possible.

The minimum you need is to store, in a file, the account information (name or number, and password), and the current balance of the account.

If you want to allow multiple accounts, you would have to list the account info along with their respective balances.

You need to read up on file input and output (and opening/closing files).

--
Mats

[mike_g]

You might want to read the section in the FAQ about working with files:

http://faq.cprogramming.com/cgi-bin/...&id=1043284392