University of Maryland College Park Department of Computer Science CMSC131 Fall 2019 Exam 1 FIRSTNAME LASTNAME PRINT IN UPPERCASE STUDENT ID e g 123456789 Instructions Please print your answers and use a pencil This exam is a closed book closed notes exam with a duration of 50 minutes and 200 total points Do not remove the exam s staple Removing it will interfere with the scanning process even if you staple the exam again Write your directory id e g terps1 not UID at the bottom of pages with DirectoryId Provide answers in the rectangular areas Do not remove any exam pages Even if you don t use the extra pages for scratch work return them with the rest of the exam Your code must be efficient and as short as possible For multiple choice questions you can assume only one answer is expected unless stated otherwise You don t need to use meaningful variable names however we expect good indentation You must write your name and id at this point we will not wait for you after time is up You must stop writing once time is up If you continue a problem on the extra page s provided make a note on the particular problem Grader Use Only Problem 1 Miscellaneous Problem 2 Diagram Problem 3 Guess Total 1 2 3 Total 62 80 58 200 1 2 3 pts How many different combinations of 0 s and 1 s can be represented with 4 bits Problem 1 Miscellaneous 1 3 pts Java compilers produce a Machine code can run on the computer CPU b Bytecode c None of the above a 4 b 8 c 16 d None of the above 3 3 pts What is the output of the following code fragment if laura compareTo tom 0 System out println laura else System out println tom 4 3 pts When is the body of a do while never executed a When the appropriate condition is provided b Never 5 3 pts Provide a statement equivalent to x 100 6 4 pts Which of the following are variable names that will compile Circle all that will compile Globe7 telephone car cos auto boat 7 4 pts Which of the following are reserved names in Java Circle all that apply else while place return 8 4 pts Write the octal representation of the decimal number 10 9 4 pts What is the output of following code fragment int a 20 int b a System out println a b String message System out println message Robert Bob Smith 2 10 4 pts Complete the following assignment so we are able to print the message below Notice that double quotes surround Bob 11 4 pts Define a String constant named BEST SCHOOL that has as value UMCP 12 6 pts Assuming a b and c are integer variables complete the following assignment that will initialize variable decreasing with the value true if a b and c are in decreasing order and false otherwise For example 10 7 3 are in decreasing order 3 5 21 are not boolean decreasing 13 7 pts What is the output of the following code fragment int a 10 b 3 boolean answer a 10 b 20 System out println a b answer System out println statement no other statement int a 1 b 4 limit 10 while a limit System out println a b a 3 14 10 pts Re write the following code fragment using a for loop The body of the for loop can only have the DirectoryId 3 Problem 2 Diagram Complete the program below The program reads a number representing the maximum number of rows associated with a triangle In addition the program will read a symbol and how many instances of that symbol should be used while drawing the triangle Once the symbol has been printed the specified number of instances the program will use if necessary Use the messages Enter rows Symbol and Number to read the number of rows the symbol and instances respectively The following are examples of running the program you are expected to write remember your program must work for other values Underlined text represents input provided by the user Enter rows 4 Symbol Number 5 Enter rows 6 Symbol Number 9 public class Diagram public static void main String args 4 Problem 3 Guess Complete the program below The program will generate a random value let s called it toGuess between 1 inclusive and 100 inclusive You can use 100 as the seed value needed by the Random class The program will proceed to read an integer value from the user and verify whether that value is the one the program generated toGuess The program will keep asking the user for a value as long as the user have not guessed the expected value toGuess If the user enters the expected value the program will print the message You won and end If the value is larger than toGuess the program will print Too high and Too low if smaller and will continue asking for another value To read a value use message Enter guess You must use the Random object to generate random values The following is an example of running the program you are expected to write remember your program must work for other values Underlined text represents input provided by the user Enter guess 3 Too low Enter guess 8 Too high Enter guess 6 You won public class Guess public static void main String args DirectoryId 5 EXTRA PAGE IN CASE YOU NEED IT LAST PAGE 6
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