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#| BEGIN (Write your solution here) |#
; My code
(define (make-account balance db-pwd)
(define error-times 0)
(define (call-the-cops) (error "Cops called"))
(define (login-fail)
(set! error-times (+ error-times 1))
(if (> error-times 7)
(call-the-cops)
""
)
)
(define (withdraw amount)
(if (>= balance amount)
(begin (set! balance (- balance amount)) balance)
"Insufficient funds"
)
)
(define (deposit amount)
(set! balance (+ balance amount)) balance
)
(define (dispatch pwd m)
(cond
((not (eq? pwd db-pwd)) (lambda (arg) (login-fail) "Wrong password"))
((eq? m 'withdraw) (set! error-times 0) withdraw)
((eq? m 'deposit) (set! error-times 0) deposit)
(else (error "Unknown request: MAKE-ACCOUNT" m))
)
)
dispatch
)
#| END |#