CSC165H1 Lecture Notes - Set Notation

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raspberrysardine362

29 Oct 2012

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P represent the set of all programs (our universe or domain ), j represent the set of all java programs, and t represent the set of all correct programs. Recall that in class, we saw how set notation like x t can be expressed in predicate notation as t (x) , and how this can be used to write di erent sentences symbolically. Keep in mind that these do not constitute all possible correct answers. (a) some incorrect program is written in java. Non-standard: x t , j(x) or x j, t (x) (b) no java program is correct. Standard: x p, j(x) t (x) Non-standard: x j, t (x) or x p, j(x) t (x) or x t, j(x) (c) only programs written in python are incorrect. Non-standard: x t , j(x) or x p, t (x) j(x) or x j, t (x) (d) the program is correct and is written in python.

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__ is the dynamic representation of a program during execution a. CPU b. ALU C. Process d. Multiprogramming

Programming Writing Montreal Maps In the following questions, you will write classes that allow one to suggest a route to get from one point to another on a metro or train line. Note that for all of these questions, we will make the simplifying assumption that the earth is flat and that everything resides in 2 dimensions. (There were metros before Columbus and Galileo, right?) 6. Write a class MetroStation in which you define a new type MetroStation. (10 points) A MetroStation is defined to have the following private properties: • String name This represents the name of the metro station (e.g. Atwater, McGill, etc) • double xPosition This represents the x location of the metro station. • double y Position This represents the y location of the metro station. An MetroStation object should have the following public methods/behaviors defined on it. • A constructor that takes as input a String stationName, a double x, and a double y. The constructor should initialize the properties name, xPosition, and yPosition to these three values respectively • A method getName() which returns the name of the Metrostation. • A method get XPosition () which returns the x location of the Metrostation • A method get Position () which returns the y location of the Metrostation • A method equals (Metrostation other) which returns a boolean representing whether the name property of the this MetroStation is equal to the name property of other.

37. True or false, the output of these two code fragments is always the same? That is, for a given pair of values for x and y, these fragments will both print 100 or both print 0. int z = 0; if (x < 20 11 y < 30) { z = 100; int z = 0; if (x < 20){ z = 100; println(z); if (y < 30) { Z = 100; println(z); The remaining questions are all about the following program // Create a class to represent a light bulb that can be // positioned, sized, given a color, and turned on and off as indicated // by the following usage of that class. Light lighti, light2, light3, light4; void setup() { size ( 400, 400); light1 = new Light (25, 25); light 2 - new Light (width-30, height-60, false); // set initially off light3 = new Light (width/2, height/2, 50); // specify the size light4 = new Light (30, height/2, 75, color (255, 0, 0));//set size and color light4.turnoff(); void draw() { lightl.show(); light2.show(); light3.show(); light4.show(); void mousePressed() { if (lightl.clicked()) { lighti.toggle(); if (light2.clicked()) { light2.toggle(); if (light3.clicked()) { light3.toggle(); if (light4.clicked()) { light4.toggle();

CSC165H1 Lecture Notes - Set Notation

CSC165H1 Full Course Notes

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