5. Questions about the problems that are e-mailed to me will not be answered before the submission deadline.6. In this document the term list should be understood to mean proper list.1. Define a LISP function MIN-2 with the following properties. MIN-2 takes two arguments,A and B. If the arguments A and B are numbers such that AB, then MIN-2 returns B. If A or B is not a number, thenMIN-2 returns the symbol ERRORExamples: (MIN-2 21.3 7/2) => 7/2(MIN-2 17.5 29) = 17.5(MIN-2 (31) (54) => ERROR(MIN-2 5 'APPLE) => ERRORLISP Assignment 3: Page 1 of 32.[Exercise 4 on p. 72 of Wilensky] Write a LISP function SAFE-AVG that takes 2 argumentsand returns the average of those arguments if they are numbers. If one or both of the argumentsis not a number, the function should return NIL.Examples: (SAFE-AVG 23 47.4) => 35.2(SAFE-AVG 3 8) = 11/2(SAFE-AVG 'ORÁNGE PLUM) => NIL(SAFE-AVG (23.1) 47.3) => NIL3.[Exercise 2 on p. 72 of Wilensky] Write a LISP predicate ODD-GT-MILLION that takes oneargument, and which returns T if its argument is an odd integer greater than a million, but returnsNIL otherwise. Hint: Make use of the predicate INTEGERP.Examples:(ODD-GT-MILLION 92010231) => T (ODD-GT-MILLION 17) => NIL (ODD-GT-MILLION 92010232) => NIL(ODD-GT-MILLION 21/5) => NIL(ODD-GT-MILLION (2010231)) = NIL(ODD-GT-MILLION 1718671.24) = NIL(ODD-GT-MILLION 'APPLE) = NIL4.[Exercise 3 on p. 72 of Wilensky] Re-read the discussion of MEMBER in sec. 6.6 of Touretzkyor on p. 51 of Winston & Hom. Then write a LISP predicate MULTIPLE-MEMBER that takestwo arguments and behaves as follows: If the first argument is a symbol or number and thesecond is a list, then MULTIPLE-MEMBER returns a true value if the first argument occurs atleast twice in the second argument, and returns NIL otherwise. 4.[Exercise 3 on p. 72 of Wilensky] Re-read the discussion of MEMBER in sec. 6.6 of Touretzkyor on p. 51 of Winston & Horn. Then write a LISP predicate MULTIPLE-MEMBER that takestwo arguments and behaves as follows: If the first argument is a symbol or number and thesecond is a list, then MULTIPLE-MEMBER returns a true value if the first argument occurs atleast twice in the second argument, and returns NIL otherwise.Examples: (MULTIPLE-MEMBER 'A '(B A BBACA D)) => (A CA D)(MULTIPLE-MEMBER 'A '(B ABBCCA D)) => (A D)(MULTIPLE-MEMBER 'A '(B A BBC D)) =- NILNotice that the behavior of MULTIPLE-MEMBER is unspecified in cases where the firstargument is not a symbol or number, and in cases where the second argument is not a list. Yourdefinition may therefore return any value or produce an evaluation error in such cases.]5. Define a LISP function MONTH->INTEGER which takes as argument a symbol that should be thename of a month, and which returns the number of the month. For example:(MONTH->INTEGER 'MARCH) => 3If the argument is not a symbol that is the name of a month, the function should return the symbolERROR For example:(MONTH-> INTEGER 'C) => ERROR(MONTH->INTEGER 'QUOTE)=>ERROR (MONTH->INTEGER '(MAY))=>ERROR(MONTH->INTEGER 'JUNE) => 6(MONTH->INTEGER 7) => ERROR6. Define a LISP function SCORE->GRADE which takes a single argument, s, and returns a symbolaccording to the following scheme:s2 9087 ss< 9083 GRADE 86.3) = B+ (SCORE->GRADE 106) => A (SCORE->GRADE -10.1) =F(SCORE->GRADE 59.9) => F (SCORE->GRADE 83) => B+ (SCORE->GRADE 74) => C+(SCORE->GRADE 67) = D(SCORE->GRADE (86.3)) => NIL (SCORE->GRADE DOG) => NIL(SCORE->GRADE 87.0) => A-

(defun MIN-2 (x y) (if (< x y) x y))

1. Define a LISP function MIN-2 with the following properties. MIN-2 takes two arguments, A and B. If the arguments A and B are numbers such that ASB, then MIN-2 returns A. If A and B are numbers such that A > B, then MIN-2 returns B. If A or B is not a number, then MIN-2 returns the symbol ERROR. Examples: (MIN-2 21.5 7/2) =- 7/2 (MIN-2 17.5 29) =- 17.5 (MIN-2 5 'APPLE)= ERROR (MIN-2 '(31) '(54)) =► ERROR LISP Assignment 3: Page 1 of 3 2.[Exercise 4 on p. 72 of Wilensky] Write a LISP function SAFE-AVG that takes 2 arguments and returns the average of those arguments if they are numbers. If one or both of the arguments is not a number, the function should return NIL. Examples: (SAFE-AVG 23 47.4) = 35.2 (SAFE-AVG 3 8) 11/2 (SAFE-AVG 'ORANGE PLUM) NIL (SAFE-AVG '(23.1) 47.3) NIL

1. Define a LISP function MIN-2 with the following properties. MIN-2 takes two arguments, A and B. If the arguments A and B are numbers such that ASB, then MIN-2 returns A. If A and B are numbers such that A > B, then MIN-2 returns B. If A or B is not a number, then MIN-2 returns the symbol ERROR. Examples: (MIN-2 21.5 7/2) =- 7/2 (MIN-2 17.5 29) =- 17.5 (MIN-2 5 'APPLE)= ERROR (MIN-2 '(31) '(54)) =► ERROR LISP Assignment 3: Page 1 of 3 2.[Exercise 4 on p. 72 of Wilensky] Write a LISP function SAFE-AVG that takes 2 arguments and returns the average of those arguments if they are numbers. If one or both of the arguments is not a number, the function should return NIL. Examples: (SAFE-AVG 23 47.4) = 35.2 (SAFE-AVG 3 8) 11/2 (SAFE-AVG 'ORANGE PLUM) NIL (SAFE-AVG '(23.1) 47.3) NIL

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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