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Date: Tue, 14 Jan 1997 20:08:44 GMTServer: NCSA/1.4.1Content-type: text/htmlLast-modified: Wed, 20 Nov 1996 01:43:15 GMTContent-length: 3812<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN"><!Converted with LaTeX2HTML 95 (Thu Jan 19 1995) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds ><HEAD><TITLE>No Title</TITLE></HEAD><BODY><meta name="description" value="No Title"><meta name="keywords" value="sample2"><meta name="resource-type" value="document"><meta name="distribution" value="global"><P> <BR> <HR><!WA0><A NAME=tex2html1 HREF="http://cs.nyu.edu/cs/dept_info/course_home_pages/fall96/A22.0002/node1.html"><!WA1><IMG ALIGN=BOTTOM ALT="next" SRC="http://cs.nyu.edu/icons2/latex2html//next_motif.gif"></A> <!WA2><IMG ALIGN=BOTTOM ALT="up" SRC="http://cs.nyu.edu/icons2/latex2html//up_motif_gr.gif"> <!WA3><IMG ALIGN=BOTTOM ALT="previous" SRC="http://cs.nyu.edu/icons2/latex2html//previous_motif_gr.gif"> <BR><B> Next:</B> <!WA4><A NAME=tex2html2 HREF="http://cs.nyu.edu/cs/dept_info/course_home_pages/fall96/A22.0002/node1.html"> About this document </A><BR> <HR> <P><P>Midterm #2 A22.0002 Afternoon session<BR> April 24, 1995 Samuel Marateck<BR> <b> Do any 5 problems and do all the work on the exam sheet</b> <BR><P> <b> Your Name</b><BR><P>1. (20 points points) What does the following program produce as output?<PRE>PROGRAM one(input, output);CONST Blank = ' ';VAR J, K:integer;BEGIN FOR j:= 1 TO 5 DO BEGIN write('*':j); FOR k:= 1 to (6 - j) DO BEGIN write(blank) END; writeln('*' ENDEND.</PRE><P>2. (20 points) Write a program that reads a number <tt> N</tt> (an <tt> integer</tt>)from the keyboard and:<P>(a) Prints all the numbers less than or equal to <tt> N</tt>that are prime numbers. A prime number is one that is divisible only by 1 and the number itself. When a number is divisible by another number there is no remainder. For example, 7 is a prime number because it is notdivisible by 2, 3, 4, 5, 6.<P>Hint: Test whether the values of the loop control variable, <tt> J</tt>are divisors of <tt> N</tt>.Here are some questions that should help youdo the problem:<P>Is <tt> N</tt> read before or in the loop?<BR><P>If <tt> j</tt> is the loop controlvariable, what is its upper limit?<BR><P>What is the test determining whether <tt> j</tt> is a divisorof <tt> N</tt>?<BR><P><P><P>3. (20 points) What does the following program produce?<PRE>PROGRAM two(input, output);VAR J:integer; letter:char;PROCEDURE plot(J:integer);VAR I:integer;BEGIN FOR I:= 1 TO J DO write('*':i); writelnEND {plot};BEGIN FOR letter:= 'a' TO 'e' DO BEGIN J:= ord(letter) - ord('a'); plot(j) END END.</PRE><P>4. (20 points) Evaluate the following (you may use the table on the board):<PRE>(a) (3 <= 7) AND NOT (9 = 8) (b) NOT (4 >= 5) OR (3 <= 3)(c) NOT ((5 <= 9) OR (3 < 2)) (d) (6 <= 8) OR (3 > 5) OR (3 = 3)</PRE><P>5. (20 points) What does the following procedure produce for <tt> plot(1,'x')</tt>?<PRE> Procedure plot ( top : Integer; ch:char); Var j : Integer; Begin Case top Of 1 : For j := 1 To 5 Do Begin Writeln (ch:j, ch:(11 - (2 * j))) End; 2 : For j := 5 DownTo 1 Do Begin Writeln (ch:j, ch:(11 - (2 * j))) End End End;</PRE><P>6. (20 points) Write a procedure called <tt> MakeX</tt> that produces the block letter X by using procedure <tt> plot</tt> shown in problem 5.The block letter should be formed from asterisks (*).<P><BR> <HR><UL> <LI> <!WA5><A NAME=tex2html3 HREF="http://cs.nyu.edu/cs/dept_info/course_home_pages/fall96/A22.0002/node1.html#SECTION00010000000000000000"> About this document ... </A></UL><BR> <HR><P><ADDRESS><I>Sam Marateck <BR>Tue Nov 19 20:15:29 EST 1996</I></ADDRESS></BODY>⌨️ 快捷键说明
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