2002ACTestQuestions

# Each digit should have the same probability of being

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Each digit should have the same probability of being returned. If you complete the randomOddDigit() method correctly, the output of the above application Q5 might be similar to the following: C:\> java Q5 3 7 1 C:\> java Q5 9 9 5

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Question/Answer Sheet - Page 9 - CompSci 101 AC SURNAME: ...................................................... FORENAMES: ........................................................... CONTINUED Question 6 (6 marks) What is the output when the following application is executed? public class Q6 { public static void main(String[] args) { boolean isReady = false; int num1, num2; num1 = 20; num2 = 30; if (num1<20 && num2>15) { if(isReady) System.out.println("Line 1"); else System.out.println("Line 2"); System.out.println("Line 3"); } else if (!(num1<20 || num2>30)) { if(isReady) System.out.println("Line 4"); else System.out.println("Line 5"); System.out.println("Line 6"); } if (num1<100 || num2>30) { if(!isReady) System.out.println("Line 7"); else System.out.println("Line 8"); System.out.println("Line 9"); } System.out.println("Line 10"); } }
Question/Answer Sheet - Page 10 - CompSci 101 AC SURNAME: ...................................................... FORENAMES: ........................................................... CONTINUED Question 7 (6 marks) Write a method, printLuckyColour() , which first generates a random integer between 0 and 6 inclusive and then prints a message to the DOS window depending on the value of the random number. If the random number is either 0 or 1 then the message printed is “ Lucky colour: green If the value of the random number is 2, 3 or 4 then the message is “ Lucky colour: red Otherwise the message is “ Lucky colour: blue ”. public static void printLuckyColour() { }

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Question/Answer Sheet - Page 11 - CompSci 101 AC SURNAME: ...................................................... FORENAMES: ........................................................... CONTINUED Question 8 (6 marks) What is the output when the following application is executed? public class Q8 { public static void main(String[] args) { boolean b1 = 6 < 10; boolean b2 = true; boolean b3 = !b1; b1 = 10 > 6 && b2; System.out.println("b1: "+b1); System.out.println("b2: "+b2); System.out.println("b3: "+b3); } }
Question/Answer Sheet - Page 12 - CompSci 101 AC SURNAME: ...................................................... FORENAMES: ........................................................... CONTINUED Question 9 (10 marks) Complete the method, printColumn() , which prints two columns of numbers to the DOS window. The method takes one parameter, num , which is the start number for the left hand column. The number on the left of each row decreases from the start number down to 1 and the number on the right of each row increases from 1 up to the start number. In each row the numbers are separated by a dash. public static void printColumn(int num){ } For example, if the following three calls to the printColumn() method are made: printColumn(3); printColumn(5); printColumn(4); the following output is obtained: 3 – 1 2 – 2 1 – 3 5 – 1 4 - 2 3 – 3 2 – 4 1 – 5 4 - 1 3 – 2 2 – 3 1 – 4

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Question/Answer Sheet - Page 13 - CompSci 101 AC SURNAME: ...................................................... FORENAMES: ...........................................................
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• Summer '12
• Computer Science, English-language films, ........., ASCII, syntax error, Logic error

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