Predicates in LISP : Practice MCQ Questions & Answers with Explanations

Both integerp and zerop will be same when both will show either T or NIL. Both will show T when argument is 0 and NIL when argument is not an integer.

It is the predicate used to check whether the argument is zero or not. It will show T (true) only if the argument is numeric zero, that is, 0 and NIL in all other cases.

Atom, symbolp, listp, numberp all are considered as data type predicates. Atom is used check if an argument is atom or not. Similarly, symbolp is used to check symbols, listp to check lists and numberp to check whether the argument is a number or not.

Eql is used by member argument to compare between its two arguments. Eql is one of the equality predicates and is used to test for numbers and symbols of the same type.

From procedure name to produce procedure object # is used always.

It is used to modify a procedure's basic behaviour along the line.

MEMBER will return what is left of the list when the matching symbol is encountered.

Equal primitive tests two arguments to see if their values are the same expression. It works on atoms and lists.

A predicate is a procedure that returns a value that signals true or false.