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I need an additional LISP lesson


Bluebird1973

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Hi together,

 

I'm looking for a "jump mark" or a "goto-function" but there is no one.

I need a simplification of my code because I don't want to write the programs e.g.(program 1), (program 2),... twice under each (progn because there are the same.

 

...

(if (/= 0 checkPINstate)

(progn

(requestPIN)

(if (= checkPIN inputPIN)

(program 1)

(program 2)

...

...

)

)

(progn

(program 1)

(program 2)

...

...

)

)

...

kind regards

Bluebird1973

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There are a lot of different ways to approach this

 


 [b][color=BLACK]([/color][/b]while [b][color=FUCHSIA]([/color][/b]/= 0 checkPINstate[b][color=FUCHSIA])[/color][/b]
        [b][color=FUCHSIA]([/color][/b]requestPIN[b][color=FUCHSIA])[/color][/b]
        [b][color=FUCHSIA]([/color][/b]checkPINstate[b][color=FUCHSIA])[/color][/b][b][color=BLACK])[/color][/b]
 [b][color=BLACK]([/color][/b]program1[b][color=BLACK])[/color][/b]
 [b][color=BLACK]([/color][/b]program2[b][color=BLACK])[/color][/b]

 

This will force a correct PIN, leaving only esc as a alternate exit ( probably not the most elegant nor best solution )

 

-David

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My 2c...

(cond ((and (/= 0 checkpinstate) (requestpin) (= checkpin inputpin)) (program 1) (program 2))
     ((program 1) (program 2))
)

Edited by ronjonp
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Hi David,

Hi ronjonp,

 

Thanks for your try, but it didn't work.

 

kind regards

Bluebird1973

 

With your example above, (program1) and (program2) will always run so not sure where you're going with this?:?

 

Perhaps:

(cond ;; Pin already validated .. run programs
     ((= 0 checkpinstate) (program 1) (program 2))
     ;; Pin not validated, get the pin, if pin checks out then run programs
     ((and (requestpin) (= checkpin inputpin)) (program 1) (program 2))
)

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What if (requestpin) asigns a global variable 'checkpinstate' and then the funciton itself returns nil.

 

Another 2c..

(if (member checkpinstate '(nil 0)) (requestpin))
(cond ( (and checkpinstate (/= 0 checkpinstate)) (program1) (program2) ))

 

Thanks for your try, but it didn't work.

 

When requesting for hints, the copy-paste approach doesn't work always with the examples.

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Perhaps:

(cond
 ;; Pin already validated .. run programs
 ((= "0" (getenv "checkpinstate")) (program 1) (program 2))
 ;; Pin not validated, get the pin, if pin checks out set the 'checkpinstate' variable then run programs
 ((and (requestpin) (= checkpin inputpin)) (setenv "checkpinstate" "0") (program 1) (program 2))
)

 

Kind of hard to come to a solution when 1/2 of this requires reading minds LOL.

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I found now a solution.

 

 

[color=RED]([/color][color=BLUE]progn[/color]
  [color=RED]([/color][color=BLUE]cond[/color]
     [color=RED]([/color]
        [color=RED]([/color][color=BLUE]/=[/color] [color=#009900]0[/color] checkPINstate[color=RED])[/color]
           [color=RED]([/color][color=BLUE]progn[/color]
              [color=RED]([/color]requestPIN[color=RED])[/color]
              [color=RED]([/color][color=BLUE]cond[/color]
               [color=RED]([/color]
                 [color=RED]([/color][color=BLUE]/=[/color] checkPIN inputPIN[color=RED])[/color]
                    [color=RED]([/color][color=BLUE]progn[/color]
                     [color=RED]([/color][color=BLUE]princ[/color] [color=#a52a2a]"\nError: bad argument pw"[/color][color=RED])[/color]
                     [color=RED]([/color][color=BLUE]exit[/color][color=RED])[/color]
                     [color=RED])[/color]
               [color=RED])[/color]
              [color=RED])[/color]
           [color=RED])[/color]
     [color=RED])[/color]
  [color=RED])[/color]

  [color=RED]([/color][color=BLUE]if[/color] [color=RED]([/color][color=BLUE]=[/color] [color=BLUE]Prog[/color] checkProg[color=RED])[/color]
     [color=RED]([/color][color=BLUE]progn[/color]
        [color=RED]([/color][color=BLUE]cond[/color]
           [color=RED](([/color]program [color=#009900]1[/color][color=RED]))[/color]
           [color=RED](([/color]program [color=#009900]2[/color][color=RED]))[/color]
           [color=RED](([/color]program [color=#009900]3[/color][color=RED]))[/color]
           [color=DARKRED].[/color][color=DARKRED].[/color][color=DARKRED].[/color]

 

 

kind regards

Bluebird1973

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I found now a solution.

 

 

[color=RED]([/color][color=BLUE]progn[/color]
  [color=RED]([/color][color=BLUE]cond[/color]
     [color=RED]([/color]
        [color=RED]([/color][color=BLUE]/=[/color] [color=#009900]0[/color] checkPINstate[color=RED])[/color]
           [color=RED]([/color][color=BLUE]progn[/color]
              [color=RED]([/color]requestPIN[color=RED])[/color]
              [color=RED]([/color][color=BLUE]cond[/color]
               [color=RED]([/color]
                 [color=RED]([/color][color=BLUE]/=[/color] checkPIN inputPIN[color=RED])[/color]
                    [color=RED]([/color][color=BLUE]progn[/color]
                     [color=RED]([/color][color=BLUE]princ[/color] [color=#a52a2a]"\nError: bad argument pw"[/color][color=RED])[/color]
                     [color=RED]([/color][color=BLUE]exit[/color][color=RED])[/color]
                     [color=RED])[/color]
               [color=RED])[/color]
              [color=RED])[/color]
           [color=RED])[/color]
     [color=RED])[/color]
  [color=RED])[/color]

  [color=RED]([/color][color=BLUE]if[/color] [color=RED]([/color][color=BLUE]=[/color] [color=BLUE]Prog[/color] checkProg[color=RED])[/color]
     [color=RED]([/color][color=BLUE]progn[/color]
        [color=RED]([/color][color=BLUE]cond[/color]
           [color=RED](([/color]program [color=#009900]1[/color][color=RED]))[/color]
           [color=RED](([/color]program [color=#009900]2[/color][color=RED]))[/color]
           [color=RED](([/color]program [color=#009900]3[/color][color=RED]))[/color]
           [color=DARKRED].[/color][color=DARKRED].[/color][color=DARKRED].[/color]

 

 

kind regards

Bluebird1973

FWIW .. this will accomplish the same thing without a messy exit.

;; Assumes that your (requestpin) actually returns something
(if (or (= 0 checkpinstate) (and (requestpin) (/= checkpin inputpin) (= prog checkprog)))
 (progn (program 1) (program 2) (program 3))
 (princ "\nError: bad argument pw")
)

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