CS 115 Midterm 2 Exam Review Quiz
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1 CS115Midterm2ExamReviewQuiz April7,2009 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. Youareencouragedtousethebacksofthesepagesforscratchpaper.Ifyou wantanswerswrittentheretobegraded,theymustbeveryclearlylabeled andalsonotedonthemaintest,e.g. Seethebackofpage1for3a.
2 Problem1:15points. Whatistheoutputofeachofthefollowingsnippetsofcode? (a) for (int i = 1; i <= 3; i++) { for (int j = 1; j <= 2; j++) { cout << i+j << " "; cout << endl; (b) int a[6] = {5, 8, 7, 9, 13, -1; cout << a[4] << endl; (c) Ifthefollowingfunctionisdefinedsomewhereintheprogramand prototypedabovemain. int square(int& x) { return x*x; whatdoesthefollowingcodeprint? int x = 5; int y = square(x); cout << x << endl; cout << y << endl;
3 Problem2:10points. (a) Forthesnippetofcode float f[50]; whatisthedatatypeoff[15]? (b) Assumethatthefollowingdeclarationappearsabovethemainprogram: struct team_record { string team_name; float total_score; float num_wins; ; Forthesnippetofcode team_record teams[2]; whatisthedatatypeofteams?
4 Problem3:25points. Thesnippetsofcodeinthisproblemdonotsuccessfullyaccomplishthetask describedintheiraccompanyingcomment.correctthecodesothatitperformsthe taskdescribedinthecomment.thecodemayhavemorethanoneerror.make yourcorrectionsclearandunambiguous. (a) /* Function that finds and returns the smallest element of an integer array. Inputs are the array and its size */ int FindMin(int[] array, int size) { int min = 0; for (int i=0; i <= size; i++) { if (i < min) { min = array[i]; (b) Forthisproblem,youmayassumethatthestruct team_recordfrom Problem2bhasbeendeclaredabovethemainprogram. /* Update a team s record after a new game. The team s score in the new game is in the variable score, and the team s win-loss record for that game is in the variable points */ team_record my_team; float points, score; my_team[total_score] += score; my_team[num_wins] = points;
5 (c) /* Function sets every element of the array arr to init_value. Size = size of the array. */ int InitArray(int[] arr, int init_value, int size) { for (int i=0; i<= size; i+1) { cout << init_value;
6 Problem4:25points. Writeshortsnippetsofcodetoaccomplishthefollowingtasks: (a) Foranarraythathasbeendeclaredas float floatarr[5][8]; writeasnippetofcodethatcomputesandprintstheaverageofallthe elementsintheentirearray. (b) Forthisproblem,youmayassumethatthestruct team_recordfrom Problem2bhasbeendeclaredabovethemainprogram.Writeasnippetof codethatdeclaresanteam_recordarrayofsize50andinitializesthe scoresandpointtotalstozeroforeachelementofthearray.
7 (c) Writeasnippetofcodethatrepeatedlyasksfortheuser sinputasa character.iftheuser sinputis u,yourcodeshouldcallthefunction Update(),whichhasnoinputs.Iftheuser sinputis p,yourcodeshould callthefunctionprint(),whichhasnoinputs.iftheuser sinputis q, youshouldprintagoodbyemessageandstopprintingthemenu.iftheinput isanythingelse,youshouldprintanerrormessageandreprintthemenu.
8 Problem5:25points. Forthisproblem,youmustwriteacompleteprogramthatcontainsthefollowing: ThedefinitionofastructcalledMenuItemthathastwofields.Youshould decidetheappropriatedatatypesforthesefields: o itemname,thenameofamenuitem o price,itspriceindollars AfunctioncalledComputeAvgthatcomputestheaveragepriceofanarray ofmenuitem.itsreturnvalueistheaverageprice,asafloat.itsinputsare: o inputarr,anarrayofmenuitem o size,thesizeofthearray PrototypeforComputeAvg Amainfunctionthatdoesthefollowing: o Declaresanarrayof3MenuItem variables o Initializesthemenuitemsasfollows: Thefirstitemiscoffee,for1.25 Theseconditemisbagel,for2.25 Thethirditemissmoothie,for3.75 o CallsComputeAvg tocomputetheaveragepriceofaniteminthe menu o Printstheaveragepricecomputedby ComputeAvg.
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![cout << How many numbers would you like to type? ; cin >> memsize; p = new int[memsize];](/thumbs/77/75038547.jpg "cout << How many numbers would you like to type? ; cin >> memsize; p = new int[memsize];")
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