COMP 248 Lecture 1: ExampleRandomGenerator.java

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lemonsalmon353

21 Feb 2018

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/* comp 248: example on how to use the random class */ // import this class to be able to use the random class import java. util. random; public class examplerandomgenerator { public static void main(string[] args) { // create an object of the class random. // let the generator generate a random integer bewtween 0 (inclusive) and 4 (exclusive) // for more information on the random class and the various methods available, see https://docs. oracle. com/javase/8/docs/api/java/util/random. html int randomintbetween0_1_2_or_3 = mygenerator. nextint(4); System. out. println("here is a random integer between 0 (included) and 4 (not included): " + randomintbetween0_1_2_or_3); System. out. println("\njust for fun, here are 10 more"); for (int i=1; i<10; i++) {

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COMP 2021Winter 2010 - Final Examination Pape 11 110 6 . The two classes low compile without me. What is displayed when the main() method of class Nightmareix is executed? Clearly indicate the program output in the appropriate space ca pe You may use the other lank space as a scratch pad to track the state of memesy as the program escoles, but the contents of this other space will not he graded The definition of the Pair claw public cla Pair private int left: private int right publie Pairintit T left- right - public void nix (Pair pl loft - P.left public string toitring) return "IL... lort R right "1" The definition of the NightmareMix class public class Nightmareix public static void mix Inta (int il, int 12) public static void mixArraywithint fint 11 a, int i, int v) 11 - V public static void mixArrayaor Int(int il al, intl a2) public static void mixMatrixWithint fint 11111121 - m int 11, int 12, int v public static void mixMatrix WithArray (int 11 11- , int i, intila) public static void mixlar Addresses Pair pl, Pair 2) pl - p2 public static void mixArrayWithPairState (Pair) a, int i, Pair pl public static void mixArrayWithPairAddress (Pairla, int i, Pair p) ali - P; public static void mixArrayaoraira (Pairil al, Pairil a2) public static void main(Stringil arga) int myV1 - 1; int myV2 - 2; int my = (3, 4) int my2 = 5, 6) into myM1 , 8 9, 10}} Pair myP1 = new Pair (11, 12) Pair myP2 = new Pair (13, 14) Pair myPA (neu Pair (15, 16), new pair(17, 18) Pair myPA2 = (neu Pair (19, 20), new pair (21, 22) mixInita (myvi, myV2); mixArrayWith Int (myal, 0, myv2); mixArraysOfIntinyal, myA2); MixMatrixWithint (myM, 0, 0, myV2); mixArrayaofTnt (HyMIO, myM[1); mixMatrixWithArray (wy, , WyA2); mixArraywithint nyA2, 0, myV2); mixPair Addresses (wypi, myP2); RixPairAddren (HyPALIO), WPAI[1]); mixArraywithPairstate (myPA2, 0, 1); mixArraywithPairAddresa (myPA2, 1, WP2); mixArray Paira (wyPal, myPAZ) System.out.println("1.. myvi) System.out.println("2: ( +WA110 A11] + " ") System.out.println("3: ( + myA2[0] + + m 2 (1) + " ); System.out.println("4: ( myM[0][0] + "," myM[0][1] + " myM[1][0] + " " + myM[1][1] + "} ") System.out.println('5: ( + myPA10) + myPA [1] + " "); System.out.println("6: ( myPA2[0 PA21] + " ); 1"

Longer multiple choice questions (3 points each) Coding Question - Fibonacci sequence You are to write a method named "Fibo" that takes as input an integer n, and returns the nth number in the Fibonacci sequence. If Fibo (n) denotes the nth number in the Fibonacci sequence, then recall for n > 2, Fibo (n) = Fibo (n-1) + Fibo (n-2), and Fibo (1) = 1 and Fibo (2) = 1. You are to assume that the user is always going to enter an input greater than 2. For example Fibo (4) = 3. Use the 7 following questions to "write" your code. Pay close attention to how your answers group together with each other. 26. Line 1 (A) public static int Fibo (int n) { (B) public static void main(String[] args) { (C) public static int Fibo () { (D) public static void Fibo (Double input) { (E) public static void Fibo (int n) {

2. In this section you will be shown several classes. Inside the code for each class will be a question. You should provide your answer to the question inside the chart. Many of the questions will ask you whether a variable has changed or not. In cases that the variable being asked about is a primitive type, you should provide your answer based on the data stored in the primitive type. In cases that the variable being asked about is a reference type, you should provide your answer based on the data stored at the Object linked to by the reference type. For example, in the first snippet, the question asks about the variable x defined in the main method. Since x is a primitive type, you should answer YES if you think the variable x has had its value changed after the method methodOne() returns. All your answers should go in the chart below: (9 points) Part Answer to question x changed (circle one)? YES NO y changed (circle one)? a changed (circle one)? b changed (circle one)? d1 a changed (circle one)? b changed (circle one)? YES e words changed (circle one)? YES NO Values in array of array referred to by y: What is printed to the screen? (a) public class ReferenceTesti public static void methodOne (int x){ x++; public static void main(String[args) { int x = 0; methodOne (x); //IS THE DATA STORED OR REFERRED TO BY X THE SAME? (ANSWER IN CHART)

COMP 248 Lecture 1: ExampleRandomGenerator.java

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