#include <stdio.h>
#include<stdlib.h>
#define PIN 1010 
int  amount = 1000, deposit, withdraw;
int choice, pin, k = 0;
 
int main(){

  while (pin != PIN)
    {
      printf("Enter Pin: ");
      scanf("%d", &pin);
      getchar();
      if (pin != PIN)
	printf("Invalid Pin! ");
    }
 printf("***** Welcome to ECE15's ATM *****\n");
  do
    {
      printf("***** Select Service *****\n");
      printf("1. Check Balance\n");
      printf("2. Withdraw Cash\n");
      printf("3. Deposit Cash\n");
      printf("4. Quit\n");
      printf("***** ***** *****\n");
      printf("Your Choice: ");
      scanf("%d", &choice);
      getchar();
      switch (choice) {
	case 1:
	  printf("Your Balance is: $%d\n", amount);
	  break;
	case 2:
	  printf("Withdrawal Amount in $: ");
	  scanf("%d", &withdraw);
	  if (withdraw % 5 != 0) {
	      printf("Not a multiple of 5!\n");
	    }
	  else if (withdraw >(amount - 100))
	    {
	      printf("Insufficient Balance!\n");
	    }
	  else
	    {
	      amount = amount - withdraw;
	      printf("Please collect your cash!\n");
	      printf("Your new balance is: $%d\n", amount);
	    }
	  break;
	case 3:
	  printf("Deposit Amount in $: ");
	  scanf("%d", &deposit);
	  amount = amount + deposit;
	  printf("Your new balance is: $%d\n", amount);
	  break;
	case 4:
	  break;
	default:
	  printf("Invalid choice!\n");
	}
    } while (choice != 4);
  printf("Thanks for using the ECE15's ATM!\n");
  return 0;
}