[PDF] ComS 207: Programming I Midterm 1 SAMPLE SOLUTIONS

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ComS207:ProgrammingI

Midterm1,SAMPLESOLUTIONS

StudentName:Mr.Perfect

StudentIDNumber:555-55-555

RecitationSection:1

1.True/FalseQuestions(10x1peach=10p)

andasetofbehaviorsdefinedbyitsmethods. 1

2.ShortAnswerQuestions(5x2peach=10p)

(a)Whatisanenumeratedtype? areidentifiers,andcanbeanythingdesired. (b)Whatisanobject? owndataspaceandthereforeitsownstate. (d)Whatisautoboxing? anobjectofthattypeusingthenewoperator. 2 -i.25to49 intiNum=rand.nextInt(25)+25; -ii.-5to6 intiNum=rand.nextInt(12)-5; -iii.Generatearandomoddintegerfrom1to100 intiNum=rand.nextInt(50)*2+1; (b)Thisisthesameas(a)butwith casehowever. -i.1.5to1.7 doubledNum=rand.nextDouble()*0.2+1.5; -ii.-1.2to-0.2 doubledNum=rand.nextDouble()-1.2; 3

4.BugChase(5p+10p=15p)

withthecodeatthatlocation. (a)(5p) =======File:Buggy1.java======== publicclassBuggy1 publicstaticvoidmain(String[]args){

Strings=newString("John");

System.out.println("Mynameis"+s);

return; (b)(10p) =======File:Account.java======== publicclassAccount privateStringaccName;

Account(Stringname){

accName=name; publicvoidprintInfo(){ =========File:Bank.java========== publicclassBank publicstaticvoidmain(String[]s){

Accountaccount=newAccount("JohnSmith");

account.printInfo(); return; 4 doubleresult; intnum1=5,num2=12,num3=2; doubleval1=5.0,val2=12.0,val3=2.0; (a)result=num2/num1;2.0 (b)result=val3+num2/num1;4.0 (c)result=num3+val2/num1;4.4 (d)result=num2/num3/num1;1.0 (e)result=val2*num1+num2/num3;66.0 (g)result=(val2*(num1+num2))/num3;102.0 (h)result=val2*((num1+num2)/num3);96.0 (i)result=num1*num3*4%num2/val3;2.0 (j)result=num1+++++num2;18.0 5 (a)Rectangles(15p) oatingpointnumbers publicclassRectangles publicstaticvoidmain(String[]args) doublex1,y1,x2,y2;

Scannerscan=newScanner(System.in);

x1=scan.nextDouble(); y1=scan.nextDouble(); x2=scan.nextDouble(); y2=scan.nextDouble(); //enteredthecornersinthewrongorder. doublehSide=Math.abs(x2-x1); doublevSide=Math.abs(y2-y1); doubleperimeter=hSide*2.0+vSide*2.0; doublearea=hSide*vSide;

System.out.println("Area="+area);

6 (b)PasswordGenerator(15p)

System.out.printf("%c",'A'+num);

importjava.util.Random; publicclassPasswordGenerator publicstaticvoidmain(String[]args)

Randomrand=newRandom();

//Getthetwoletters(1stand4-thcaracters) intfirstChar=rand.nextInt(26);//0to25 intfourthChar=rand.nextInt(26);//0to25 //Getthetwonumbers(2ndand5-thcaracters) intsecondChar=rand.nextInt(10);//0to9 intfifthChar=rand.nextInt(10);//0to9 //Printthepassword

System.out.print("Yourpasswordis:[");

System.out.printf("%c",'A'+firstChar);

System.out.print(secondChar);

System.out.print("-");

System.out.printf("%c",'A'+fourthChar);

System.out.print(fifthChar);

System.out.print("]\n");

7 (c)RadianstoDegrees(15p) oating-

Sampleinput:2.0

Hint1:degrees=(radians/Math.PI)*180.0;

importjava.util.Scanner; publicclassRadians2Degrees publicstaticvoidmain(String[]args)

Scannerscan=newScanner(System.in);

doubleradians=scan.nextDouble(); //Calculatethedegrees doubledegrees=(radians/Math.PI)*180.0; intdeg=(int)Math.floor(degrees); //Calcualatetheminutes doubleminutes=60.0*(degrees-deg); intmin=(int)minutes; //CalculateSeconds doubleseconds=60.0*(minutes-min); intsec=(int)seconds;

System.out.print(radians+"radians=");

System.out.print(deg+"degrees,");

System.out.print(min+"minutes,");

System.out.print(sec+"seconds.\n");

8 (d)FormattingNames(20p) followedbyaperiod. importjava.util.Scanner; publicclassFormattingNames publicstaticvoidmain(String[]args)

Scannerscan=newScanner(System.in);

StringallNames=scan.nextLine();

//Extractthefirstname intfirstSpaceIdx=allNames.indexOf(''); //ExtracttheSecondName 9 //Extractthethirdname //Printthenameintheformat:LAST,FirstM.

System.out.print(",");

System.out.print(firstName);

System.out.print("");

System.out.print(secondName.charAt(0));

System.out.print(".");

System.out.print("\n");

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