COMP 202 Lecture Notes - Lecture 20: Java Virtual Machine, For Loop, Bracket

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ivorybear388

28 May 2016

School

McGill University

Department

Computer Science (Sci)

Course

COMP 202

Professor

Melanie Lyman- Abramovitch

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Comp 202 lecture 20 midterm review. Algorithm: a set of clear and specific instructions for carrying out a task or solving a problem. Compiling: in java this is the process that turns the java file into a class file. The class file contains the bytecode that is then interpret by the java virtual machine or computer. Decimal to binary: what is 5310 in binary notation (base 2)? o. Errors that do not effect code functions but rater make it hard to read: compile error. Syntax errors preventing compiling of code: run time errors. Do not prevent code from compiling but can cause it to crash at run time: logical errors. It compiles and runs but does wrong thing. Scanner: in order to obtain user input, we can create a variable of type java. util. scanner o. Variable types o: all expect for string are primitive types.

Related Questions

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 202 Lecture Notes - Lecture 20: Java Virtual Machine, For Loop, Bracket

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