![]() The evaluator works as a function that takes a valid LISP form as an argument and returns a value. This second level of evaluation defines a syntax that determines which s-expressions are LISP forms.Īny list that has a symbol as its first element The evaluator defines syntax of Lisp forms that are built from s-expressions. The reader translates the strings of characters to LISP objects or s-expressions. ![]() In the previous chapter, we mentioned that the evaluation process of LISP code takes the following steps. The value nil, that stands for logical false, as well as an empty list. The letter t, that stands for logical true. Only three types of elements are constants and always return their own value LISP tries to evaluate everything, including the arguments of a function. LISP expressions are case-insensitive, cos 45 or COS 45 are same. LISP represents a function call f(x) as (f x), for example cos(45) is written as cos 45 The basic numeric operations in LISP are +, -, *, and / Some Notable Points before Moving to Nextįollowing are some of the important points to note − When you click the Execute button, or type Ctrl+E, LISP executes it immediately and the result returned is − ![]() (write-line "I am at 'Tutorials Point'! Learning LISP") (write-line "Hello World") greet the world
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