A Lisp Interpreter

Download: .exe file, zipped sources

Supported Operators

• quote, if, lambda
• Arithmetic operators: +, *, -, /
• List operations: first, rest, cons, list
• Comparisons: >, >=, <, <=, =

User interface

The main part of the user interface consists of a textbox for user inputs and a listbox for displaying in/out statements. In additon, the user interface shows the elements of the current environment and a tree like representation of the selected expression.

Sample in/out

	ttl>(define x 2)
	2
	ttl>(* x 5)
	10
	ttl>(set x (+ x x))
	4
	ttl>(define square(lambda (x) (* x x)))
	lambda
	ttl>(square x)
	16
	ttl>(define compose (lambda (f g) (lambda (x) (f (g x)))))
	lambda
	ttl>((compose square square) 2)
	16
	ttl>(define  fact (lambda (n) (if (<= n 1) 1 (* n (fact (- n 1))))))
	lambda
	ttl>(fact 10)
	3628800
	ttl>