What is Defparameter in Common Lisp?
DEFPARAMETER defines global variable with dynamic scoping. Usual conventions dictate to make such variables easy to distinguish so their name is surrounded by stars. Value for variable is reevaluated for each occurence (unlike with DEFVAR). See also DEFVAR, LET, SETQ.
How do you assign a value to a variable in Lisp?
valn are the initial values assigned to the respective variables. When let is executed, each variable is assigned the respective value and lastly the s-expression is evaluated. The value of the last expression evaluated is returned. If you don’t include an initial value for a variable, it is assigned to nil.
What is Princ Lisp?
Prints an expression to the command line, or writes an expression to an open file.
What are car and CDR used for?
The car and cdr functions are used for splitting lists and are considered fundamental to Lisp. Since they cannot split or gain access to the parts of an array, an array is considered an atom. Conversely, the other fundamental function, cons , can put together or construct a list, but not an array.
What’s the difference between write print Pprint Princ and prin1?
write is the general entry point to the Lisp printer. prin1 produces output suitable for input to read . princ is just like prin1 except that the output has no escape characters. princ is intended to look good to people, while output from prin1 is intended to be acceptable for the function read .
What is Terpri in LISP?
Frill-free printing in LISP is achieved with print, prin1, princ and terpri. The simplest uses of print, prin1, and princ involve a single argument. Terpri, which produces a newline, can be called with no arguments. All these are functions.
What does CAR and CDR do in Lisp?
Why is it called CAR and CDR?
The origins of the names for car and cdr are a little bit historical and comes from the IBM 704. car is an acronym from the phrase Contents of the Address part of the Register; and cdr is an acronym from the phrase Contents of the Decrement part of the Register.