COMP 248 Lecture Notes - Lecture 1: Master Of Music

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lemonsalmon353

21 Feb 2018

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/* purpose: this program calculates the change to be given by a roman vendor. /* we assume that the client always pays 1 solidus (7200 nummus) and. /* that the item costs between 1 to 7200 nummus. The following will be used throughout this code for readability and public class romanchangev1 public static void main(string[] args) // constant variables to represent the value of each denomination in. Nummus efficiency final int one_solidus = 7200; final int one_miliarense = 600; final int one_siliqua = 300; final int one_follis = 40; // main variables int price; int nbmiliarense = 0, nbsiliqua = 0, nbfollis = 0; // setting up scanner for keyboard user input. // step 1: getting the price from the user. System. out. print("enter the price of the ticket in nummus (at most. System. out. println("\nyou bought a ticket for " + price + " nummus and gave me a solidus, so your change is");

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5. Consider the following class: import java.util.Scanner; public class Money private int dollars; private int cents; public Money (int d, int c) { dollars = d; cents = c; /* Point 1 */ public String toString() { String result; if (cents > 100) int totalCents = dollars * 100 + cents; dollars = totalCents / 100; cents = total Cents % 100; /* Point 2 */ /* Point 3 */ result = "$" + dollars + ", " + cents + "C"; return result; public static void main(String[] yourGrandfather) Scanner keyboard - new Scanner (System.in); Money amount; int C; /* Point 4 */ System.out.print("Enter an amount in cents: "); C = keyboard.nextInt (); amount = new Money (c/ 100, CX 100); System.out.println("You have: " + amount.toString()); The above program compiles and runs without error. Which variables are in scope at each of the points marked by comments in the above class? In other words, if each of these comments were replaced by an actual Java statement, which variables could be used in this statement without a prefix (that is, without having to write the name of a class or other variable in front of the variable name) and without the compiler reporting an unknown variable error? List each variable that is in scope at each of the points marked by comments in the above class, and indicate whether it is an instance variable, a formal parameter, or a local variable. Note that you will be penalized for every variable that is out of scope at a given point but that you list as being in scope at that point.

4. In this question, you will be shown a snippet of code. You will then be shown the output from either the compiler or the Java virtual machine and be asked what the error is and how to fix it. In each case, your answer should include the line number of the problem, a one or two sentence explanation as to why the issue occurs, and a specific fix for the problem. Your fix should mention the exact line or lines of code you'd add/change/delete. Total for this question (5 parts): (15 points) (a) Consider the following class: import java.util.Scanner; public class Hockeystandings //This method should calculate the percentage of games in which the team lost. public static double computePercentageLosses (int numwins, int numLosses) return numLosses/ (numwins + numLosses) * 100; public static void main(String[] args) { Scanner reader - new Scanner (System.in); System.out.println("Enter the number of wins for the Maple Leafs"); int numLeafwins = reader.nextInt (); System.out.println("Enter the number of losses for the Maple Leafs"); int numLeaflosses-reader.nextInt (); System.out.println("Enter the number of wins for the Canadiens"); int numCanadienswins – reader.nextInt (); System.out.println("Enter the number of losses for the Canadiens"); int numCanadienslosses = reader.nextInt (); double mapleLeafs Record - computePercentage Losses (numLeafwins, numLeaf Losses); double canadienskecord - computePercentage Losses (numCanadienswins, nuCanadienslos305): if (canadiens Record > mapleleafsRecord) { System.out.println("Of course the Leafs did worse."); else { System.out.println("Wow, that hasn't happened for a long time!"); The point of the program is to ask the user to enter numbers representing the wins and losses of the Maple Leafs and Canadiens in a season. The code compiles successfully and when you run the program, you enter the values: 2 80 40 42 into the keyboard. You expect that the program will output the message Of course the Leafs did worse since they had fewer wins. However, to your surprise, the output of the program is: Wow, that hasn't happened for a long time! Why is this the case and fix the error?

COMP 248 Lecture Notes - Lecture 1: Master Of Music

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