chapter 1  introduction to computer science

... unit supervises the overall operation of the computer Programming Fundamentals Secondary Storage  Secondary storage devices are used to be permanent storage area for programs and data  Examples: ... and optical storage CD Magnetic hard disk Floppy disk CD ROM etc… Programming Fundamentals Some terminology  A computer program is a set of instructions used to operate a computer to produce a ... unit stores information Each computer contains memory of two main types: RAM and ROM  RAM (random access memory) is volatile Your program and data are stored in RAM when you are using the computer

Ngày tải lên: 29/03/2017, 18:16

... 1 . Introduction? ?to? ?Computer? ?Security Prof. Bharat Bhargava Department of? ?Computer? ?Sciences, Purdue University August 2006 In collaboration with: ... “Need? ?to? ?know” basis for data access    E.g., access? ?to? ?a? ?computer? ?room, use of a desktop Confidentiality is:   10 How do we know a user is the person she claims? ?to? ?be? Need her identity and need? ?to? ?verify this identity ... S = Secure  Need? ?to? ?Balance  CIA Example 1: C vs. I+A    Example 2: I vs. C+A    Disconnect? ?computer? ?from Internet? ?to? ?increase confidentiality Availability suffers, integrity suffers due? ?to? ?lost updates

Ngày tải lên: 30/01/2020, 11:03

... type of computer To create large or small applications Why Program?  Computer is a tool used by so many professions  Computers can many different jobs because they are programmable  Computers ... Computers are designed to whatever job their programs, or software, tell them to Why Program? (Cont’d)  Computer programmers:   Create software Some things must be designed for computer program: ... Hardware   Refers to the physical components that a computer made of A typical computer system consists of:      The central processing unit (CPU) Main memory Secondary storage devices Input

Ngày tải lên: 27/09/2022, 22:04

... Trang 1 Chapter 1 What is Programming? Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) by Trang 2 Chapter Preview In this chapter ... * program — a set of directions telling a computer exactly what to do * programming languages — languages for specifying sequences of directions to a computer ¢ algorithm — a sequence of language ... Is pervasive — easy to create multiple objects of the same type — easy to create similar objects without having to rewrite the overlapping code ¢ OOP makes programs easier to understand and more

Ngày tải lên: 11/01/2020, 19:29

... is stored on the system heap • A client is program that uses an object         Client Rights • To declare variables of the class type • To create instances of the class using constructors • To ... sent to objects • Objects respond to messages that are in their protocols or interfaces     Objects • Encapsulate data values within a single entity • Their behavior is often general enough to ... Chapter Classes and Methods III: Static Methods and Variables Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) by S.N Kamin, D Mickunas, E Reingold     Chapter

Ngày tải lên: 11/01/2020, 18:40

... Chapter Iteration Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) by S.N Kamin, D Mickunas, E Reingold     Chapter ... do-while statements • demonstrate the use of loop invariants to verify the correctness of loops • show the use of loops in data entry and computer animation     while Loop • Repeated executes body

Ngày tải lên: 11/01/2020, 18:43

... Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) by S.N Kamin, D Mickunas, E Reingold     Chapter Preview In this chapter we will: • show how to organize ... provided to programmers along with the Java compiler (e.g Math or MouseEvent) – Java expects to find these classes in separate directories or folders • The classes stored in each directory form ... java.lang.Math.sqrt(3); • Using an import statement // to allow unqualified references to // all package classes import package.name.*; // to allow unqualified references to // a particular package class import

Ngày tải lên: 11/01/2020, 18:45

... technique is to divide a problem into smaller subproblems • These subproblems may also be divided into smaller subproblems • When the subproblems are small enough to solve directly the process stops ... Chapter 14 Recursion Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) by S.N Kamin, D Mickunas, , E Reingold Chapter ... chapter we will: • introduce recursion as a programming technique • show how recursion can be used to simplify the design of complex algorithms • present several well known recursive algorithms (e.g

Ngày tải lên: 11/01/2020, 18:46

... can respond to mouse events (e.g clicks and mouse movements) demonstrate how to implement a listener Interface show how mouse events can be used to build Trang 3 Abstract Windowing Toolkit (AWT) ... this chapter is labeled optional, itis not possible to be a complete Java Trang 4 Java Events Events are occurrences outside of the program to which the program must respond (e.g user key press) ... Event managers are methods that first catch the event Listener classes send messages to an event manager requesting to be notified when a particular message occurs Trang 5 Creating Mouse Click Listeners

Ngày tải lên: 11/01/2020, 18:47

... Chapter Classes and Methods II Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) by S.N Kamin, D Mickunas, E Reingold     Chapter ... initialized to default values if no initializers are found – integers and doubles are initialized to – characters are initialized to the null character (ASCII code 0) – booleans are initialized to false ... Reads and stores the hour and minute data String toString() Returns string version of time suitable for printing void setHour(int h) Sets hour to h void setMinute(int m) Sets minute to m int getHour()

Ngày tải lên: 11/01/2020, 19:00

... { Button buttonname; public classname() { buttonname = new Button(“button label”); add(buttonname); but tonname ActionListener (this): } public void actionPerformed(ActionEvent e) { what to do ... Trang 10 Frame Inheritance Example public class TwoButtons extends Frame { Button redButton, blueButton; public TwoButttons() { super(“Two Buttons Frame”); Trang 11 Other Simple Java Components ... as well Trang 5 Frame Example public class TwoButtons { Frame f; Button redButton, blueButton; public TwoButttons() { f = new Frame(“Two Buttons Frame”); Trang 7 UML Notation The filled diamond

Ngày tải lên: 11/01/2020, 19:02

... Chapter Classes and Methods I Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) by S.N Kamin, D Mickunas, E Reingold     Chapter ... source listings to make things more readable • comments – lines beginning with two slashes // – single or multiple lines enclosed by /* */ – that allow the programmer to insert notes to help other ... predefined collections of programs providing services to many programmers (e.g CSLib.* package used throughout the text) • class heading   – needs to be included at the beginning of every program

Ngày tải lên: 11/01/2020, 19:06

... Chapter One-Dimensional Arrays Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) by S.N Kamin, D Mickunas, E Reingold     Chapter ... error – trying to access variable outside counts Expressions as Subscripts • Array subscripts not have to be constants • Array subscripts need to be integer expressions that evaluate to valid subscript ... passed as an argument to a method, what is passed is a pointer to the array, not a new array (arrays are passed by reference) • This means that if the method makes changes to the array, these changes

Ngày tải lên: 11/01/2020, 19:27

... It is legal to assign a char to an int variable int i = ‘a’; // assigns 97 to i • It is legal to assign an int to an char variable char c = 97; // assigns ‘a’ to c • It is possible to perform ... type int is not infinitely large and it is possible to compute a value incorrectly because the value is too large to be stored in an int variable storage location • Unlike the real numbers in mathematics ... Operators • Self-assignment temperature = temperature + 10; • Increment cent++; equivalent to cent = cent + 1; • Decrement cent ; equivalent to cent = cent - 1;     Initializers • May be used to

Ngày tải lên: 11/01/2020, 20:03

... Chapter Nested Loops and Two-Dimensional Arrays Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) by S.N Kamin, D Mickunas, E Reingold     Chapter ... of two-dimensional arrays to represent grids of information • show how computer graphics are generated using pixels     Nested for Loops • Nested loops frequently used to process twodimensional

Ngày tải lên: 11/01/2020, 20:21

... objects Java provides constructors for each class • The StringBuffer class also contains a ToString method to allow easier output Sequential Files • Files are stored are stored on disks • In this ... Chapter 15 Text Processing and File Input/Output Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) by S.N Kamin, D Mickunas, E Reingold Chapter ... the end of line • PrintWriter is a wrapper class provided to convert several data type values to printable forms Writing to a File • To make a file available for printing PrintWriter pr = new

Ngày tải lên: 11/01/2020, 20:25

... Chapter 10 Classes and Methods IV: Static Methods and Variables Lecture Slides to Accompany An Introduction to Computer Science Using Java (2nd Edition) by S.N Kamin, D Mickunas, E Reingold Chapter ... it as a message to an object • The class method f in the class C is invoked using the notation f.C( … ) • It has no receiver and cannot refer to instance variables • It can refer to and manipulate ... variable, not one instance per object • Created by adding the modifier static to the variables declaration • Allows variables to be modified once for all class objects • Can be accessed by class methods

Ngày tải lên: 11/01/2020, 20:29

... testing DSP code Software simulators run on a host computer to mimic the behavior of a DSP chip The 18 INTRODUCTION TO REAL-TIME DIGITAL SIGNAL PROCESSING simulator is able to show memory contents, ... breakpoint The command to enable a breakpoint can be given from the Toggle Breakpoint hot button on the project toolbar or by clicking the right mouse button and choosing toggle breakpoint The ... the integrator output voltage to get back to zero is directly proportional to the input voltage This technique is very precise and can produce ADCs with high resolution Since the integrator is used...

Ngày tải lên: 17/10/2013, 14:15

... types of computer languages Assembly language • • • • English-like abbreviations representing elementary computer operations Clearer to humans Incomprehensible to computers – Translator programs ... (stream extraction operator) • Used with std::cin • Waits for user to input value, then press Enter (Return) key • Stores value in variable to right of operator – Converts value to variable data type ... std::cout – “Connected” to screen –

Ngày tải lên: 10/03/2014, 06:20