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17 Aug 2018

5. Which of the following Java expressions do NOT have a value of 0. (A) ((double) 1) / ((int) 2) (B) (int) (((double) 1) / 2) (C) (double) (1 / 2) (D) 1 / 2 (E) (int)1.0 / 2

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Jean Keeling
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19 Aug 2018
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34. Which line of code would you add to the Graph.java (code 5) on line 18 to pick two random nodes from your array of nodes? These will then be connected to each other. N.B. Math.random() returns a real number (double) between 0 and 1. (A) GraphNode nodel = graph[ (int) (Math.random() *n)]; GraphNode node2 = graph[ (int) (Math.random() *n)]; (B) GraphNode nodel = graph[ (int) Math.random() *n); GraphNode node2 = graph [ (int) Math.random() *n); (C) GraphNode nodel = graph [Math.random() *n]; GraphNode node2 = graph [Math.random() *n]; (D) int pos = (int) Math.random() *n; GraphNode nodel = graph [pos]; GraphNode node2 = graph [pos]; (E) int pos = (int) (Math.random() *n); GraphNode nodel = graph [pos]; GraphNode node2 = graph [pos];

14. Consider the following method header: public static void method (double X, int y) Which of the following are valid ways to use this method? Write the letters corresponding to the correct answer(s) on your answer sheet. Note that there are five options total. Two are on the next page. (a) System.out.println (method (4,4)); (b) String s = "apple" method (Math.pow (2,3), s.length()); (c) double x=1.2; int y=7; method (double x, int y); (d) method (2.5, Math.sqrt (4)); (e) method (4, 4);

27. Line 2 (A) int fib1 = 1; int fib2 = 1; (B) None of these statements are useful when paired with other questions, leave blank. (C) int n = 100; n-=0; (D) n +=1; (E) int[] = new int [n];

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