Difference Between Two Numbers in LISP

A simple program that I wrote using LISP to ask the user to give two numbers and then the program find the difference between two numbers and display the results on the screen.

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Sample Program Output

Program Listing

difference.lisp

(defun difference()

(terpri)

(princ "Difference Between Two Numbers in LISP ")

(terpri)

(terpri)

(princ "Enter First Value  : ")

(setq a (read))

(princ "Enter Second Value : ")

(setq b (read))

(terpri)

(setq product (- a b ))

(princ "The difference is  ")

(write product))

(difference)