ATM Cash Withdrawal in C program

#include<stdio.h>
#include<conio.h>
unsigned long amount=25000, deposit, withdraw;
int choice, pin, i;
char transaction ='y';
void main()
{
 clrscr();  
 while (pin != 1097)
 {
   printf("ENTER YOUR PIN NUMBER: ");
   scanf("%d", &pin);
   if (pin != 1097)
   printf("PLEASE ENTER VALID PASSWORD\n");
 }
 do
 {
    printf(" Welcome to ATM Service \n");
    printf("1. Check Balance\n");
    printf("2. Withdraw Cash\n");
    printf("3. Deposit Cash\n");
    printf("4. Quit\n");
    printf("\n\n");
    printf("Enter your choice: ");
    scanf("%d", &choice);
    switch (choice)
 {
   case 1:
    printf("\n YOUR BALANCE =Rs.%lu ", amount);
    break;
   case 2:
    printf("\n ENTER THE AMOUNT: ");
    scanf("%lu", &withdraw);
   if (withdraw % 100 != 0)
   {
    printf("\n PLEASE ENTER THE AMOUNT IN MULTIPLES OF 100");
   }
   else if (withdraw >(amount - 1000))
   {
    printf("\n INSUFFICENT BALANCE");
   }
   else
   {
    amount = amount - withdraw;
    printf("\n\n PLEASE COLLECT YOUR CASH");
    printf("\n YOUR CURRENT BALANCE =RS.%lu", amount);
   }
    break;
   case 3:
    printf("\n ENTER THE AMOUNT: ");
    scanf("%lu", &deposit);
    amount = amount + deposit;
    printf(" YOUR BALANCE =RS.%lu", amount);
    break;
   case 4:
    printf("\n THANK YOU USING OUR ATM SERVICES");
    break;
    default:
    printf("\n INVALID CHOICE");
   }
    printf("\n\n\n DO U WISH TO HAVE ANOTHER TRANSCATION?(y/n): ");
    fflush(stdin);
    scanf("%c", &transaction);
   if (transaction == 'n'|| transaction == 'N')
    i = 1;
 } while (!i);
    printf("\n\n THANKS FOR USING OUR ATM SERVICE");
    getch();
}

Output-1:

Output-2:

Output-3: