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Bank Account Environment Model Examples

Bank Account Environment Model Examples. Prof. Tony White April 2010. Example Bank Account: Code. (define new-withdraw      (let (( balance 100))        (lambda (amount)              (if (>= balance amount)                 

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Bank Account Environment Model Examples

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  1. Bank AccountEnvironment Model Examples Prof. Tony White April 2010

  2. Example Bank Account: Code (define new-withdraw      (let (( balance 100))        (lambda (amount)              (if (>= balance amount)                  (begin                      (set! balance (- balance amount))                      balance)                      "Insufficient funds") ) )) (define  a1 (new-withdraw 30)) (define a2 (new-withdraw 40))

  3. Example: new-withdraw let’ Π=9

  4. Example: new-withdraw let’ new-withdraw’ Π=4 Π=9

  5. Example: new-withdraw let’ Π=10

  6. Example Bank Account: Code (define(new-withdraw) (let (( balance 100))        (lambda (amount)              (if (>= balance amount)                  (begin                      (set! balance (- balance amount))                      balance)                      "Insufficient funds") ) )) (define  a1 ((new-withdraw)30)) (define a2 ((new-withdraw)40)) Now define new-withdraw as a procedure; note the brackets!

  7. Example: new-withdraw Π=9

  8. Example: new-withdraw new-withdraw’ let’ Π=9

  9. Example: new-withdraw new-withdraw’ let’ lambda’ Π=4 Π=9

  10. Example: new-withdraw Π=10

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