CMPSCI 120 Fall 2015 Midterm Exam #2 Solution Key Monday, November 16, 2015 Professor William T. Verts

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1 CMPSCI 120 Fall 2015 Midterm Exam #2 Solution Key Monday, November 16, 2015 Professor William T. Verts Page 1 of 6

2 <1> 20 Points Quick Answers. Do any 10 for full credit (2 points each); do more for extra credit (1 point each for any correct answers over 10). #DCDCDC Gainsboro YES rw-r----- g+r.bmp.gif.png.jpg.png.svg.ico England 24 Frogs%20Jump.html <SUP>3</SUP> <SUB>5</SUB> NE I want a color with red=green=blue=220 (decimal). What is the corresponding HTML color code? (Don t forget the # symbol!) What is the (closest) named color code to the color in the first problem? (See table of color names in the Companion.) Is the color in the first problem a shade of gray? (All three color primaries are the same value.) Is the color in the first problem browser safe? (All three color primaries must from the set 00, 33, 66, 99, CC, FF) In my home UNIX folder I type chmod 644 public_html. Can I still open the folder with cd public_html? (No x permissions.) What are the permissions (use rwxrwxrwx form) on frog.jpg if I type the command chmod 640 frog.jpg at the prompt? The permissions on toad.gif are rw----r-- currently. How do I fill in chmod toad.gif to add read permission to my group? Which graphics file format(s) (.BMP,.JPG,.GIF,.PNG,.SVG,.ICO) contain a 24-bit color mode that is uncompressed? Which graphics file format(s) are raster formats that support transparency? Which graphics file format(s) are very good for photographs of natural scenes? Which graphics file format(s) are text-based and not raster based? Which graphics file format(s) are used for little pictures on titles and tabs of Web browsers? (See: favicons.) I have a choice to download a huge file from California or from England. Which is the better choice when it is 7:00pm at UMass? Does it matter to the completion of your assignments if the elsrv3 server is in the COMPSCI building at UMass or somewhere in Boston? If you lose your UNIX password, can a system administrator recover it for you? (It can be reset but not recovered.) Is the IP address a legal IPv4 address? (The 306 is more than 255.) What is 4! (four factorial)? (4! = ) How would I modify the file name Frogs Jump.html to make it part of a legal URL? (All blanks in URLs must be replaced by %20 codes.) How would I typeset the fraction 3 5 in HTML? (There is no &frac35; entity.) How many computer programmers does it take to change a light bulb? (It s a hardware problem! Note: I did tell you to read the Jokes chapter!) Page 2 of 6

3 <2> 25 Points For all the questions on this page consider the following JavaScript fragment. The fragment is located somewhere between <BODY> and </BODY>. <SCRIPT TYPE="text./javascript">  </SCRIPT?> <SCRIPT> <H1>JavaScript is not running</h21> </SCRIPT> A: 5 Points Correct all errors on the code above. (Mark up the code itself.) text.javascript should be text/javascript BOARDER should be BORDER (common spelling error) Last <TR> should be </TR> (</TABLE>) should be ("</TABLE>") </SCRIPT? should be </SCRIPT> <H1> </H2> should be either <H1> </H1> or <H2> </H2> B: 5 Points What HTML code is written out when the corrected JavaScript fragment runs? <TABLE BORDER> <TR><TD>1</TD><TD>1</TD></TR> <TR><TD>2</TD><TD>4</TD></TR> <TR><TD>3</TD><TD>9</TD></TR> <TR><TD>4</TD><TD>16</TD><TR> </TABLE> C: 5 Points What appears on screen when the HTML code is rendered by the browser? Page 3 of 6

4 D: 5 Points What HTML code is written out if JavaScript is not enabled in the browser? Nothing is written out! The browser will use: <H1>JavaScript is not running</h1> E: 5 Points Rewrite the JavaScript code that is between the <TABLE> and </TABLE> tags to be more efficient and flexible. var N = 1 ; while (N <= 4) { document.writeln("<tr><td>",n,"</td><td>",n*n,"</td></tr>") ; N = N + 1 ; } Page 4 of 6

5 <3> 20 Points Here are some descriptions of a Web site: In the external file MyStyles.css: H1 {color:red} H2 {color:blue} In the <HEAD> </HEAD> of the current HTML document: <LINK REL="stylesheet" TYPE="text/css" HREF="MyStyles.css"> <STYLE TYPE="text/css"> H1 {color:green} </STYLE> What color is each of the following heading tags in the current document? A: 5 Points: <H1>xxxxxxx</H1> Answer: green B: 5 Points: <H2>xxxxxxx</H2> Answer: blue C: 5 Points: <H3>xxxxxxx</H3> Answer: black (not default) D: 5 Points: How do I set one particular H1 heading to be yellow? <H1 STYLE="color:yellow">xxxxxxx</H1> <4> 15 Points Here s the code for a form: <FORM NAME="MyForm"> <INPUT TYPE="text" NAME="TextBox1">Input <INPUT TYPE="text" NAME="TextBox2">Output <INPUT TYPE="button" NAME="MyButton" VALUE="Click Me" ONCLICK="Process();"> </FORM> A: 5 Points Inside the Process() function, how would I assign the numeric value of the first text box to variable N? var N = parsefloat(document.myform.textbox1.value) ; B: 5 Points Inside the Process() function, how would I assign the value of N+1 into the second text box? document.myform.textbox2.value = String(N+1) ; C: 5 Points What does the form look like on screen? (Draw a picture.) Page 5 of 6

<5> 20 Points The following image shows a 300 200 pixel graphic containing three objects: a circle, a rectangle, and a polygon. Complete the HTML code below to turn the image, called Computers.

6 <5> 20 Points The following image shows a pixel graphic containing three objects: a circle, a rectangle, and a polygon. Complete the HTML code below to turn the image, called Computers.gif, into a client-side image map, where the circle links to the rectangle links to the 4-point polygon links to and the background of the image links to In the image the gray grid (normally not shown) is at a 10-pixel spacing, and all points of interest are shown as small square dots (also normally not shown). All points are on 10- pixel boundaries (i.e., a point might be at coordinates <30,20>, but not at <32,18>, for example). <IMG SRC="Computers.gif" USEMAP="#MyMap"> <MAP NAME="MyMap"> <AREA SHAPE="circle" COORDS="210,70,40" HREF=" <AREA SHAPE="rect" COORDS="150,140,280,180" HREF=" <AREA SHAPE="poly" COORDS="60,30,150,120,120,150,30,60,60,30" HREF=" <AREA SHAPE="default" HREF=" </MAP> On the poly, I usually close the polygon by repeating the first point at the end of the list; this is not required by most Web browsers. The last SHAPE must be default so it won t override any other shapes. Page 6 of 6

CMPSCI 120 Fall 2016 Professor William T. Verts

CMPSCI 120 Fall 2016 Professor William T. Verts CMPSCI 120 Fall 2016 Midterm Exam #2 Solution Key Wednesday, November 16, 2016 Professor William T. Verts 20 Points Quick Answers. Do any 10 for full credit (2 points each); do more for extra credit