lisp comment ;;; CrapsSim.lsp
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lisp comment """
lisp comment The main purpose of this program was to implement a Craps game, using a language that we have just
lisp comment learned. Also, it was written in a functional style with almost no reliance on the assignment
lisp comment operation. Only one local variable called THROW was used.
lisp comment """
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lisp comment ;;; ====================================================================================================== ;;;
lisp comment ;;; ======================================= CRAPS SIMULATION ============================================= ;;;
lisp comment ;;; ====================================================================================================== ;;;
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lisp comment ;;; ** This function takes no parameters as input and returns a random number between 1 and 6. **
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lisp code (DEFUN THROW-DIE ()
lisp code (+ (RANDOM 6) 1) ;;; get a random number between 0 and 5 and then add 1
lisp code )
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lisp comment ;;; ====================================================================================================== ;;;
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lisp comment ;;; ** This function takes no parameters as input and returns a LIST with two numbers between 1 and 6. **
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lisp code (DEFUN THROW-DICE ()
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lisp code (LIST (THROW-DIE) (THROW-DIE)) ;;; create a list with two random numbers
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lisp code )
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lisp comment ;;; ====================================================================================================== ;;;
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lisp comment ;;; ** This function takes two numbers as parameters for input and returns T or Nil. T is returned if both
lisp comment ;;; numbers are equal to 6. Nil is returned otherwise. **
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lisp code (DEFUN BOXCARS-P (A B)
lisp code (AND (EQUAL '6 A)
lisp code (EQUAL '6 B)
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lisp comment ;;; ====================================================================================================== ;;;
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lisp comment ;;; ** This function takes two numbers as parameters for input and returns T or Nil. T is returned if both
lisp comment ;;; numbers are equal to 1. Nil is returned otherwise. **
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lisp code (DEFUN SNAKE-EYES-P (A B)
lisp code (AND (EQUAL '1 A)
lisp code (EQUAL '1 B)
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lisp comment ;;; ====================================================================================================== ;;;
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lisp comment ;;; ** This function takes two numbers as parameters for input and returns T or Nil. T is returned if the
lisp comment ;;; sum of both numbers is equal to a 7 or 11. Nil is returned otherwise. **
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lisp code (DEFUN INSTANT-WIN-P (A B)
lisp code (OR (EQUAL '7 (+ A B))
lisp code (EQUAL '11 (+ A B))
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lisp comment ;;; ====================================================================================================== ;;;
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lisp comment ;;; ** This function takes two numbers as parameters for input and returns T or Nil. T is returned if the
lisp comment ;;; sum of both numbers is equal to a 2, 3 or 12. Nil is returned otherwise. **
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lisp code (DEFUN INSTANT-LOSS-P (A B)
lisp code (OR (EQUAL '2 (+ A B))
lisp code (EQUAL '3 (+ A B))
lisp code (EQUAL '12 (+ A B))
lisp code )
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lisp code )
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lisp comment ;;; ====================================================================================================== ;;;
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lisp comment ;;; ** This function takes two numbers as parameters for input and returns a string. If function BOXCARS_P
lisp comment ;;; returns T, then the returned string equals BOXCARS. If function SNAKE_EYES_P returns T, then the
lisp comment ;;; returned string equals SNAKE_EYES. The string contains Nil otherwise. **
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lisp code (DEFUN SAY-THROW (A B)
lisp code (COND ((BOXCARS-P A B) 'BOXCARS) ;;; make use of function BOXCARS_P
lisp code ((SNAKE-EYES-P A B) 'SNAKE-EYES) ;;; make use of function SNAKE_EYES_P
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lisp code )
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lisp comment ;;; ====================================================================================================== ;;;
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lisp comment ;;; ** This is the main function used to simulate the game of craps. Variable THROW contains a LIST of two
lisp comment ;;; numbers between 1 and 6. The numbers located in THROW, are used as parameters for the other functions.
lisp comment ;;; The several pieces used for output are listed together and then the LIST is returned from this
lisp comment ;;; function.
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lisp code (DEFUN CRAPS ()
lisp code (LET THROW (THROW-DICE)) ;;; get initial roll of the dice
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lisp comment ;;; if roll is a win, then LIST the appropriate output
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lisp code (COND ((INSTANT-WIN-P (FIRST THROW) (SECOND THROW))
lisp code (LIST 'THROW (FIRST THROW) 'AND (SECOND THROW) '-- (+ (FIRST THROW) (SECOND THROW)) '-- 'YOU 'WIN))
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lisp comment ;;; if roll is a loss, then check for BOXCARS or SNAKE-EYES
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lisp code ((INSTANT-LOSS-P (FIRST THROW) (SECOND THROW))
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lisp code (IF (EQUAL 'NIL (SAY-THROW (FIRST THROW) (SECOND THROW))) ;;; if Nil then LIST appropriate output
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lisp code (LIST 'THROW (FIRST THROW) 'AND (SECOND THROW) '-- (+ (FIRST THROW) (SECOND THROW)) '-- 'YOU 'LOSE)
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lisp comment ;;; else include the BOXCARS or SNAKE-EYES string in the output
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lisp code (LIST 'THROW (FIRST THROW) 'AND (SECOND THROW) '-- (SAY-THROW (FIRST THROW) (SECOND THROW))
lisp code '-- 'YOU 'LOSE)))
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lisp comment ;;; if roll is not instant win or loss then output sum of dice
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lisp code (T (LIST 'THROW (FIRST THROW) 'AND (SECOND THROW) '-- 'YOUR 'POINT 'IS (+ (FIRST THROW)
lisp code (SECOND THROW))))
lisp code ) ;;; end COND
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lisp code ) ;;; end LET
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lisp code )
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lisp comment ;;; ======================================== END OF PROGRAM CRAPS ======================================== ;;;