Answer / chaitanya

In Prolog, backtracking is a process adopted by Prolog.  When a sub-goal fails in Prolog, the Prolog system moves its steps backwards to the previous goal and tries to re-satisfy it. Backtracking enables Prolog to find all alternative solutions to a given query.

 Explain what is the importance of the hash table in LISP?

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What is the output of the given statement? * (defstruct person (sex nil) (personality ‘nice)) * (setf person-instance-1 (make-person)) * (setf person-instance-2 (make-person :sex ‘female)) * (person-p ‘(this is a list — not a person instance)) a) Female b) Nice c) T d) Nil

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Which checks the evaluated key form against the unevaluated keys using EQL? a) COND b) CASE c) NIL d) SETF

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 What is the output of the following statement? * (defun both-ends-with-special ()(setf whole-list (cons (first whole-list) (last whole-list)))) * (setf whole-list ‘(monday tuesday wednesday thursday friday)) * (both-ends-with-special) a) Monday b) Friday c) Wednesday d) Both a & b

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 What is the output of the given statement? * (defstruct person (sex nil) (personality ‘nice)) * (setf person-instance-1 (make-person)) * (setf person-instance-2 (make-person :sex ‘female)) * (person-personality person-instance-2) a) Female b) Nice c) Person d) Both a & b

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What is the output of the given statement? * (defstruct person (sex nil) (personality ‘nice)) * (setf person-instance-1 (make-person)) * (setf person-instance-2 (make-person :sex ‘female)) a) Person :sex female :personality nice b) Person :sex c) Sex:Female d) None of the mentioned

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Explain what is CLOS in LISP? What are the goals of the common lisp object system?

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Which keyword is used to define macro procedures in LISP? a) Defun b) Demacro c) Defmacro d) None of the mentioned

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 Which can be represented in bytes in LISP? a) Boxes and pointers b) Lists c) Lisp d) None of the mentioned

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 Which symbol holds the first element and also an index in LISP? a) Nail b) Tail c) Initial d) All of the mentioned

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 Which hides details behind abstraction boundaries? a) Procedures b) Procedure abstraction c) Recursion d) Both a & b

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 What is the output of the following statement? * (setf meals ‘(breakfast lunch tea dinner)) * (first meals) a) Breakfast b) Lunch c) Tea d) Dinner

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