cse142_final_sample_2

cse142_final_sample_2 - CSE 142 Sample Final Exam #2 1....

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
CSE 142 Sample Final Exam #2 1. Expressions (5 points) For each expression in the left-hand column, indicate its value in the right-hand column. Be sure to list a constant of appropriate type (e.g., 7.0 rather than 7 for a double , String s in quotes). E x pre ssi o n V a lue 12 / 5 + 8 / 4 2.5 * 2 + 17 / 4 21 / 2 + "7 % 3" + 17 % 4 46 / 3 / 2.0 / 3 * 4 / 5 2. Array Mystery (10 points) Consider the following method: public static int mystery(int[] array) { int x = 0; for (int i = 0; i < array.length - 1; i++) { if (array[i] > array[i + 1]) { x++; } } return x; } In the left-hand column below are specific arrays of integers. Indicate in the right-hand column what value would be returned by method mystery if the integer array in the left-hand column is passed as its parameter. A rr a y V a lue R e tu r n e d int[] a1 = {8}; mystery(a1); int[] a2 = {14, 7}; mystery(a2); int[] a3 = {7, 1, 3, 2, 0, 4}; mystery(a3); int[] a4 = {10, 8, 9, 5, 6}; mystery(a4); int[] a5 = {8, 10, 8, 6, 4, 2}; mystery(a5); 1 of 8
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
3. Inheritance Mystery (10 points) Assume that the following classes have been defined: public class Pen extends Sock { public void method1() { System.out.println("pen 1"); } } public class Lamp { public void method1() { System.out.println("lamp 1"); } public void method2() { System.out.println("lamp 2"); } public String toString() { return "lamp"; } } public class Book extends Sock { public void method2() { System.out.println("book 2"); } } public class Sock extends Lamp { public void method1() { System.out.println("sock 1"); } public String toString() { return "sock"; } } Given the classes above, what output is produced by the following code? Lamp[] elements = {new Book(), new Pen(), new Lamp(), new Sock()}; for (int i = 0; i < elements.length; i++) { System.out.println(elements[i]); elements[i].method1(); elements[i].method2(); System.out.println(); } 2 of 8
Background image of page 2
4. File Processing (15 points) Write a static method named wordStats that accepts as its parameter a Scanner holding a sequence of words and that reports the total number of words and the average word length. For example, suppose the Scanner is scanning an input source that contains the following words: To be or not to be, that is the question. For the purposes of this problem, we will use whitespace to separate words. That means that some words include punctuation, as in "be," . (This is the same definition that the Scanner uses for tokens.) For the input above, your method should produce exactly the following output: Total words = 10 Average length = 3.2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/11/2011 for the course CSE 142 taught by Professor Martystepp during the Spring '07 term at University of Washington.

Page1 / 8

cse142_final_sample_2 - CSE 142 Sample Final Exam #2 1....

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online