Final Exam. CSC 121 Fall 2015 TTH. Lecturer: Howard Rosenthal. Dec. 15, 2015
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1 Final Exam. CSC 121 Fall 2015 TTH Lecturer: Howard Rosenthal Dec. 15, 2015 Your Name: Key The following questions (or parts of questions) in numbers 1-17 are all worth 2 points each. The programs have indicated point values. There are 2 programs to write. There are 112 points on this test which means you can earn up to 12 extra points towards your test average. Remember that only the Command Box and Notepad++ with no other programs available may be open until you are ready to the programs. You are allowed to bring 2 double sided or 4 single sided sheets into the test with you. On the last two sheets you will find the ASCII character to decimal conversion, and some common String methods. You can detach these sheets for easier use. 1. Answer the following as true or false. _T a. The length of a String object can never be changed after it is created. _F b. short and byte variables use the same number of bits. _T c. ( JOHN.compareTo( JANE ) >0) evaluates as true. _F d. (true&&(true false)) always evaluates as false. _F e. Creating a reference variable for an object always creates a new object. _F f. Array indices can be expressed as type double values that will automatically cast down to type int. _F g. The elements of different columns of a two-dimensional array can be of different types. _F h. A method s signature includes its formal parameters and its return value. _T i. ( 2 ==2) evaluates as false. _T j. A char is represented using 2 byte Unicode in Java. _F k. If the pattern String 0.### is applied during output it guarantees that the printed number will always display three decimal places. 1
2 2. Write -33 in two s complement using 8 bits What is the decimal value of ? When a boolean array is instantiated each cell has the value false. 5. Given the following array: table ={{1,4,7,9,11}, {1,2}, {1,2,0}, {4,9,8,6,3,16}} What is the value of table[2].length? 3 2
3 6. List two different ways that methods can be overloaded. a. Different number of formal parameters b. Different types for corresponding formal parameters. 7. Write the output from this code segment: String growth = ABC ; char letter = D ; for (int i=0; i <4; i++) { growth = growth + letter; letter = (char)(letter+1); System.out.println(growth); } ABCD ABCDE ABCDEF ABCDEFG 8. To use the DecimalFormat class you must import which package? java.text 9. Given: double x = ; and the format pattern is 000.## the printed output String will be
4 10. What is the output of the following code fragment? for ( int i = 2; i <= 4; i++ ) { for (int j=5; j<=9; j=j+2) { System.out.print( j%i + " " ); } } If String text = JAVAISFUNTOLEARN then text.substring(2,6) = VAIS. 12. How many bytes does the following statement reserve for the array called sarray: String[][] sarray = new String[5][4]; Write a method header for a method called flipup with two formal parameters int number and String str that returns a reference to a one-dimensional String array. public static String [] flipup(int number, String str) 14. System.out.println ((3 + 4) + +(9+8)); prints out as What is the print out from the following code segment: char cx = a ; String str1 = Hello ; System.out.println( str1 +cx +33); Helloa33 4
5 16. Assume static Random die = new Random(); Write a statement that simulates the roll of a 6 sided, 12 sided and 4 sided die and puts the sum into an integer called lucky. Lucky = die.nextint(6) die.nextint(12) die.nextint(4) + 1; 17. How many objects are present after the following code fragment has executed? String str1 = Dog ; String str2 = new String( Dog ); String str3 = Dog ; 2 5
6 Programs: It is important to follow the instructions in each problem. two.java files to Do not mail these files until you are done with the entire exam. No second mailing will be allowed. 1. AlphaSum (28 points) Write a program with two methods. The following is done five times: The main method asks the user to enter a line, reads it in as a String, and then passes a reference to that String to a method called charsum. The method charsum capitalizes all the alpha characters. It then sums the ASCII values of all the alpha characters ignoring all other characters and returns that value as an integer to the main program. The main method then prints out a statement that includes the original string and the sum as follows The sum of the values of the capitalized alpha characters in the String is sum. Note: You can alternatively write the program this way and earn 4 extra credit points: Use a String array to store 5 Strings reading in 5 lines from the terminal. Write charsum so that its formal parameter accepts the String array as an input parameter and returns an int array with the corresponding ASCII sum values The main method would then print out 5 successive sentences, with the sum of the values as follows. The sum of the values of the capitalized alpha characters in the String i is sum. If these instructions confuse you just write the simpler program without the extra credit. You can only submit one solution or the other. 6
7 2. SearchName (28 Points) Write a program that does the following. The main method prompts for the name of file with an alphabetized list of names. The main method reads in a list of alphabetized names from the file into a String Array. The list can have up to 100 names. If the file doesn t exist there should be a soft exit. The main method then requests a name from the user. The main method then calls a method called Find. It sends Find three parameters a reference to the String array, a reference to the name being searched for, and an int parameter with the number of names that have been read in. Find then searches to determine if the name is found in the list of names using either a linear or a binary search algorithm. It return a true if the name is found on the list, false otherwise. Ignore capitalization when doing your compares, i.e. Elmer and ELmER should be considered a match. The main method then prints out a final output to the screen that says: It is true/false the name is found in the list of names in filename. Note the input file name should be alphabetized i.e Adam Bob Catherine Deena Earl Eddie Etc. 7
8 8
9 Common String Methods str.charat(k) str.substring(k) s.substring(k, n) str.indexof(s) str.indexof(s, k) str.startswith(s) str.startswith(s, k) str.equals(s) returns a char at position k in str. returns a substring from index k to the end of str returns a substring from index k to index n-1 of str returns an index of the first occurrence of String s in str returns an index of String s starting an index k in str returns true if str starts with s returns true if str starts with s at index k returns true if the two strings have equal values str.equalsignorecase(s) same as above ignoring case str.compareto(s) compares two strings s.comparetoignorecase(t) same as above ignoring case 9
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