CS 115 Midterm 2 Review Quiz

Size: px

Start display at page:

Download "CS 115 Midterm 2 Review Quiz"

Toby Allen Lucas
5 years ago
Views:

1 CS115Midterm2ReviewQuiz November6,2008 Groupmembers: Rules Youmustbrieflyexplainyouranswerstoreceivepartialcredit. Whenasnippetofcodeisgiventoyou,youcanassumethatthecodeis enclosedwithinsomefunction,evenifnofunctiondefinitionisshown.you canalsoassumethatthemainfunctionisproperlydefinedandthatthe iostream,fstream,iomanip,string,andcmathlibrarieshavebeen includedatthebeginningoftheprogram. Whenyouareaskedtowriteasnippetofcode,youmayalsoassumethatitis enclosedwithinsomefunctionthatanynecessarylibrarieshavebeen included. Whenyouareaskedtowriteacompleteprogram,youmustwritethe #includestatements,theint main(),etc.inyoursolutiontoreceivefull credit. Alineconsistingsolelyof representsoneormoreunspecifiedc++ statements,someofwhichmaychangethevaluesofprogramvariables.

2 Problem1:12points. Whatistheoutputofeachofthefollowingsnippetsofcode? (a) int a = 5; int *ptr = &a; cout << *ptr; (b) int a[3] = {5, 8, 7}; cout << a[2]; (c) Ifthefollowingfunctionisdefinedsomewhereintheprogramand prototypedabovemain. int increment(int x) { return x+1; } whatdoesthefollowingcodeprint? int x = 5; increment(x); cout << x;

3 Problem2:13points. (a) Forthesnippetofcode char c[50]; whatisthedatatypeofc[5]? (b) Forthesnippetofcode int a; whatisthedatatypeof&a? (c) Assumethatthefollowingdeclarationappearsabovethemain program: struct flightinfo { string airline; int flightnum; string from_city; string to_city; }; Forthesnippetofcode flightinfo f; whatisthedatatypeoff.flightnum?

4 Problem3:25points. Thesnippetsofcodeinthisproblemdonotsuccessfullyaccomplishthetask describedintheiraccompanyingcomment.correctthecodesothatitperformsthe taskdescribedinthecomment.thecodemayhavemorethanoneerror. (a) // Initialize all array elements to zero int a[50]; for (int i=1; i <= 50; i++) { a[i] = 0; } (b) /* Ask the user for a name, then print "You rock, [username]! " until the user types "q". */ string name; do { cout << "Enter a name (q to quit): "; cin >> name; cout << "You rock, " << name << "!" << endl; } while (name == "q");

5 (c) Forthisproblem,assumethatthestruct flightinfofromproblem2c hasbeendeclaredabovethemainprogram. /* Function that has two inputs: an array of flightinfo and the size of the array. Function changes the to_city to San Francisco for the last element of the array. Function does not return anything. */ int visitsf(flightinfo f, int size) { string flightinfo.to_city[size] = "San Francisco"; } Problem4:25points. Writeshortsnippetsofcodetoaccomplishthefollowingtasks: (a) Defineadatastructurenamedmusic_cdwiththefollowingfields.You shoulddecidewhichdatatypestouseforthefields. artist(thenameoftherecordingartist) cd_title(thenameofthecd) year(theyearofrecording) track_names(anarrayoftracknames.youmayassumethatnocdever hasmorethan30tracks.)

6 (b) Foranarraythathasbeendeclaredas float floatarr[max_size]; wheremax_sizehasbeendefinedassomeconstantinteger,writeasnippet ofcodethatdoesthefollowing: SearchthearrayfloatArrforthenumber12.5.Ifthenumber12.5isone oftheelementsoffloatarr,youshouldprint Yes! once.ifthenumber 12.5isnotoneoftheelementsofthearray,youshouldprint No! once. (c) Foranarraythathasbeendeclaredas int intarr[5][5]; writeasnippetofcodethataddsupalloftheelementsinthefirstcolumn.

7 Problem5:25points. Forthisproblem,youmustwriteacompleteprogramthatcontainsthefollowing: AfunctioncalledInitArraythathasnoreturnvalueandtwoinput parameters: o inputarr,anarrayofintegers o size,thesizeofthearray InitArrayinitializeseachelementoftheinputarraytozero. AfunctioncalledPrintArraythathasnoreturnvalueandtwoinput parameters: o inputarr,anarrayofintegers o size,thesizeofthearray PrintArrayprintsouteachelementofthearrayonitsownline.Foreach elementofthearray,itprintsthearraysubscript,followedbyacolon, followedbythevalueofthatarrayelement.forexample,foranarraywith size3whosevaluesare4,5,and6,itwouldprint 0:4 1:5 2:6 PrototypesforInitArrayandPrintArray Amainfunctionthatdoesthefollowing: o Declarestwointegerarrays,onewith10elementsandonewith50 o CallsInitArraytoinitializeeacharray o CallsPrintArraytoprinteacharray

CS 115 Midterm 2A Solutions

CS 115 Midterm 2A Solutions CS115Midterm2ASolutions November13,2008 Rules Youmustbrieflyexplainyouranswerstoreceivepartialcredit. Whenasnippetofcodeisgiventoyou,youcanassumethatthecodeis enclosedwithinsomefunction,evenifnofunctiondefinitionisshown.you