Homework #23

This problem requires Lecture 20 and book section 3.7.

Exercise 3.39, p.103 - (60 minutes)
Add the expression begin to the language.

<expression> ::=

begin <expression>{; <expression>}* end

begin-exp (exp exps)

A begin expression may contain one or more subexpressions separated by semi-colons. These are evaluated in order and the value of the last is returned. Implement this by modifying eval-expression.

The BNF for <expression> (begin-exp added)
<expression> ::= begin <expression> { ; <expression> }* end

The interpreter with variable assignment.

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Last updated at 2:14 pm on Monday, July 18, 2005.