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+;;;; MathSlap program written by Larry Heyl - Game developed by Carl Heyl
+;;;; To win make an equation with the supplied numbers, in order, adding any symbols you want but one and only one equal sign.
+;;;; This version uses a recursive loop instead of LOOP.
+
+;;;; concise instructions
+(print "MathSlap")
+(print "Hit Enter for another number. q and Enter to quit.")
+
+(defparameter *line* "")
+(defparameter *out* "MathSlap ")
+(defparameter *random-state* 0)
+(setq *random-state* (make-random-state t))
+
+;;;; append string parameter with a random number 1 through 10 and a space
+(defun concat (o)
+  (concatenate 'string o (write-to-string (+ (random 10) 1)) " ")
+)
+
+(defun recloop (o)
+;;;; append o with a random number 1 through 10 and a space
+  (setq o (concat o))
+  (print o)
+;;;; wait for input
+  (setq *line* (read-line *standard-input*))
+  (if (string= *line* "q")(quit))
+  (recloop o)
+)
+
+;;;; Add numbers to output string. Comment one of these out to start with 2 numbers.
+(setq *out* (concat *out*))
+(setq *out* (concat *out*))
+;;;; recursive loop
+(recloop *out*)
+