Let the value of x be 2 in the environment outside theexpression. What is the value of the expression given below?(let ((x 3)(y (+ x 2)))(* x y))
Question
Let the value of x be 2 in the environment outside the expression. What is the value of the expression given below?
(let ((x 3) (y (+ x 2))) (* x y))
Solution
The expression is written in Scheme, a dialect of Lisp. Here's how you evaluate it:
-
The
letexpression creates a new scope wherexis bound to3andyis bound to(+ x 2). In this scope,xis3, not2. -
The value of
yis calculated as(+ x 2), which is(+ 3 2)becausexis3in this scope. So,yis5. -
The expression
(* x y)is then evaluated as(* 3 5), which is15.
So, the value of the expression is 15.
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