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Вы можете ознакомиться и скачать презентацию на тему Programming Logic and Design Seventh Edition. Chapter 1. An Overview of Computers and Programming. Доклад-сообщение содержит 37 слайдов. Презентации для любого класса можно скачать бесплатно. Если материал и наш сайт презентаций Mypresentation Вам понравились – поделитесь им с друзьями с помощью социальных кнопок и добавьте в закладки в своем браузере.

Слайды и текст этой презентации

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Programming Logic and Design Seventh Edition Chapter 1 An Overview of Computers and Programming

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Objectives In this chapter, you will learn about: Computer systems Simple program logic The steps involved in the program development cycle Pseudocode statements and flowchart symbols Using a sentinel value to end a program Programming and user environments The evolution of programming models

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Understanding Computer Systems Computer system Combination of all the components required to process and store data using a computer Hardware Equipment associated with a computer Software Computer instructions Tells the hardware what to do Programs Instructions written by programmers

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Understanding Computer Systems (continued) Application software such as word processing, spreadsheets, payroll and inventory, even games System software such as operating systems like Windows, Linux, or UNIX Computer hardware and software accomplish three major operations Input Data items such as text, numbers, images, and sound Processing Calculations and comparisons performed by the central processing unit (CPU)

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Understanding Computer Systems (continued) Output Resulting information that is sent to a printer, a monitor, or storage devices after processing Programming language Used to write computer instructions Examples Visual Basic, C#, C++, or Java Syntax Rules governing word usage and punctuation

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Understanding Computer Systems (continued) Computer memory Computer’s temporary, internal storage – random access memory (RAM) Volatile memory – lost when the power is off Permanent storage devices Nonvolatile memory Compiler or interpreter Translates source code into machine language (binary language) statements called object code Checks for syntax errors

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Understanding Simple Program Logic Program executes or runs Input will be accepted, some processing will occur, and results will be output Programs with syntax errors cannot execute Logical errors Errors in program logic produce incorrect output Logic of the computer program Sequence of specific instructions in specific order Variable Named memory location whose value can vary

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Understanding the Program Development Cycle Program development cycle Understand the problem Plan the logic Code the program Use software (a compiler or interpreter) to translate the program into machine language Test the program Put the program into production Maintain the program

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Understanding the Program Development Cycle (continued)

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Understanding the Problem One of the most difficult aspects of programming Users or end users People for whom a program is written Documentation Supporting paperwork for a program

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Planning the Logic Heart of the programming process Most common planning tools Flowcharts Pseudocode IPO charts (input, processing, and output) TOE charts (tasks, objects, and events) Desk-checking Walking through a program’s logic on paper before you actually write the program

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Coding the Program Hundreds of programming languages available Choose based on features Similar in their basic capabilities Easier than the planning step

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Using Software to Translate the Program into Machine Language Translator program Compiler or interpreter Changes the programmer’s English-like high-level programming language into the low-level machine language Syntax error Misuse of a language’s grammar rules Programmer corrects listed syntax errors Might need to recompile the code several times

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Using Software to Translate the Program into Machine Language (continued) Figure 1-2 Creating an executable program

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Testing the Program Logical error Results when a syntactically correct statement, but the wrong one for the current context, is used Test Execute the program with some sample data to see whether the results are logically correct Debugging is the process of finding and correcting program errors Programs should be tested with many sets of data

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Putting the Program into Production Process depends on program’s purpose May take several months Conversion The entire set of actions an organization must take to switch over to using a new program or set of programs

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Maintaining the Program Maintenance Making changes after the program is put into production Common first programming job Maintaining previously written programs Make changes to existing programs Repeat the development cycle

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Using Pseudocode Statements and Flowchart Symbols Pseudocode English-like representation of the logical steps it takes to solve a problem Flowchart Pictorial representation of the logical steps it takes to solve a problem

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Writing Pseudocode Pseudocode representation of a number-doubling problem start input myNumber set myAnswer = myNumber * 2 output myAnswer stop

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Writing Pseudocode (continued) Programmers preface their pseudocode with a beginning statement like start and end it with a terminating statement like stop Flexible planning tool

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Drawing Flowcharts Create a flowchart Draw geometric shapes that contain the individual statements Connect shapes with arrows Input symbol Indicates input operation Parallelogram Processing symbol Contains processing statements such as arithmetic Rectangle

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Drawing Flowcharts (continued) Output symbol Represents output statements Parallelogram Flowlines Arrows that connect steps Terminal symbols Start/stop symbols Shaped like a racetrack Also called lozenges

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Drawing Flowcharts (continued) Figure 1-6 Flowchart and pseudocode of program that doubles a number

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Repeating Instructions Program in Figure 1-6 only works for one number Not feasible to run the program over and over 10,000 times Not feasible to add 10,000 lines of code to a program Create a loop (repetition of a series of steps) instead Avoid an infinite loop (repeating flow of logic that never ends)

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Repeating Instructions (continued) Figure 1-8 Flowchart of infinite number-doubling program

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Using a Sentinel Value to End a Program Making a decision Testing a value Decision symbol Diamond shape Dummy value Data-entry value that the user will never need Sentinel value eof (“end of file”) Marker at the end of a file that automatically acts as a sentinel

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Using a Sentinel Value to End a Program (continued) Figure 1-9 Flowchart of number-doubling program with sentinel value of 0

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Using a Sentinel Value to End a Program (continued) Figure 1-10 Flowchart using eof

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Understanding Programming and User Environments Many options for programming and user environments Planning Flowchart Pseudocode Coding Text editors Executing Input from keyboard, mouse, microphone Outputting Text, images, sound

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Understanding Programming Environments Use a keyboard to type program statements into an editor Plain text editor Similar to a word processor but without as many features Text editor that is part of an integrated development environment (IDE) Software package that provides an editor, a compiler, and other programming tools

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Understanding Programming Environments (continued) Figure 1-12 A C# number-doubling program in Visual Studio

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Understanding User Environments Command line Location on your computer screen where you type text entries to communicate with the computer’s operating system Graphical user interface (GUI) Allows users to interact with a program in a graphical environment

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Understanding User Environments (continued) Figure 1-13 Executing a number-doubling program in a command-line environment

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Understanding User Environments (continued) Figure 1-14 Executing a number-doubling program in a GUI environment

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Understanding the Evolution of Programming Models People have been writing modern computer programs since the 1940s Newer programming languages Look much more like natural language Are easier to use Create self-contained modules or program segments that can be pieced together in a variety of ways

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Understanding the Evolution of Programming Models (continued) Major models or paradigms used by programmers Procedural programming Focuses on the procedures that programmers create Object-oriented programming Focuses on objects, or “things,” and describes their features (or attributes) and their behaviors This text Focuses on procedural programming techniques

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Summary Hardware and software accomplish input, processing, and output Logic must be developed correctly Logical errors are much more difficult to locate than syntax errors Use flowcharts, pseudocode, IPO charts, and TOE charts to plan the logic Avoid infinite loops by testing for a sentinel value Use a text editor or an IDE to enter your program statements