CS 115 Exam 2, Fall 2009

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1 CS115Exam2,Fall2009 Yourname: Rules Youmustbrieflyexplainyouranswerstoreceivepartialcredit. Whenasnippetofcodeisgiventoyou,youcanassume o thatthecodeisenclosedwithinsomefunction,evenifnofunction definitionisshown o thatthemainfunctionisproperlydefined o thattheiostream,algorithm,fstream,iomanip,string,and cmathlibrarieshavebeenincludedatthebeginningoftheprogram. Whenyouareaskedtowriteasnippetofcode,youmayassume o thatyourcodeisenclosedwithinsomefunction o thatanynecessarylibrarieshavebeenincluded. Whenyouareaskedtowriteacompleteprogram,youmustwritethe #includestatements,theint main(),etc.inyoursolutiontoreceivefull credit. Alineconsistingsolelyof representsoneormoreunspecifiedc++ statements,someofwhichmaychangethevaluesofprogramvariables. Youareencouragedtousethebacksofthesepagesforscratchpaper.Ifyou wantanswerswrittentheretobegraded,theymustbeveryclearlylabeled andalsonotedonthemaintest,e.g. Seethebackofpage1for3a. Grade(instructoruseonly) Problem1 Problem2 Problem3 Problem4 Total

2 Problem1:25points. Whatdoeseachofthefollowingsnippetsofcodeprinttothescreen? (a) Whatdoesthissnippetofcodeprint? for (int i = 1; i < 4; i++) { for (int j = 1; j <= i; j++) { cout << i+j << " "; cout << endl; (b) Whatdoesthissnippetofcodeprint? float a[3] = {2.2, 3.3, 4.4; cout << a[1] << endl; (c) Ifthefollowingfunctionisdefinedsomewhereintheprogramand prototypedabovemain. int triple(int x) { return x*3; whatdoesthefollowingcodeprint? int x = 5; triple(x); cout << x << endl; CS115Midterm1,Spring2009 Page2of9

3 (d) Forthesnippetofcode char c[50]; whatisthedatatypeofc? (e) Ifthefollowingfunctionisdefinedsomewhereintheprogramand prototypedabovemain. void InitArray(int x[][5]) { for (int i=0; i<5; i++) { for (int j=0; j<5; j++) { x[i][j] = i + j; whatdoesthefollowingcodeprint? int array[5][5]; InitArray(x); cout << x[2][3] << endl; CS115Midterm1,Spring2009 Page3of9

4 Problem2:20points. Thesnippetsofcodeinthisproblemdonotsuccessfullyaccomplishthetask describedintheiraccompanyingcomment.correctthecodesothatitperformsthe taskdescribedinthecomment.thecodemayhavemorethanoneerror.make yourcorrectionsclearandunambiguous. (a) /* Function that you can call to swap the values of two integer variables */ void Swap(int a, int b) { a = b; b = a; (b) /* Declares an array of 3 floating-point values and sets them all to 1 */ float values[2] = 1; CS115Midterm1,Spring2009 Page4of9

5 (c) /* Function that takes an array, its size, and some value. Returns TRUE if all array elements are greater than this value and false otherwise. */ float CompareValues(int[] arr, int size, int some_value) { for (int i=0; i<= size; i+1) { if (i > value) { return true; CS115Midterm1,Spring2009 Page5of9

6 Problem3:25points. Writeshortsnippetsofcodetoaccomplishthefollowingtasks: (a) Foranarraythathasbeendeclaredas float floatarr[5][8]; writeasnippetofcodethatfindsandprintsthelargestelementintheentire array. (b) Repeatedlyasktheusertoenteraninteger.Keeppromptinguntiltheuser entersapositiveinteger.becarefultoaccountforthepossibilitythatthe userentersaletter. CS115Midterm1,Spring2009 Page6of9

7 (c) Writeafunctionthattakes2integersasinputsandreturnswhichevervalue islarger. CS115Midterm1,Spring2009 Page7of9

8 Problem4:30points. Forthisproblem,youmustwriteacompleteprogramthatcontainsthefollowing: Afunction,definedbelowthemainfunction,calledReadAnimalswiththe followingproperties: o Parameters: stringarr,anarrayofchars N,aninteger(thesizeofthearray) o Returnvalue:none o Description:ForeachoftheNarrayelements,thisfunctionshould prompttheusertoenterthenameofananimalandreadthatname intothearray. PrototypeforReadAnimals Afunction,definedbelowthemainfunction,calledFindItemwiththe followingproperties: o Parameters: inputarr,anarrayofstrings N,aninteger(thesizeofthearray) value,astring o Returnvalue:aninteger o Description:Thefunctionshouldsearchforvalueintheelementsof thearrayinputarrandreturnthearraysubscriptwhereitisfirst found.ifnoneoftheitemsinthearrayareequaltovalue,return 1. PrototypeforFindItem Amainfunctionthatdoesthefollowing: o Declaresanarrayof10strings o CallsReadAnimalstoinitializethearray o Inaninfiniteloop: Promptstheusertoenterthenameofananimal. CallsFindItemtosearchforthatnameinthearrayofstrings Iftheanimal snamewasfound,prints Found at index Thefirstblankshouldbefilledinwiththenameoftheanimal, andthesecondblankshouldbethearraysubscriptwhereit wasfound. Iftheanimal snamewasnotfound,prints Not found. CS115Midterm1,Spring2009 Page8of9

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