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Chapter 1

An Introduction to Computers and Visual Basic

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Outline and Objectives

–Introduction to Computers–Using Windows–Files and Folders–An Introduction to Visual Basic

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Parts of a Computer System:

• Hardware: Electronic Devices

• Software: Instructions and Computer Programs

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Main components of Hardware:

• Input : Keyboard, Mouse

• System unit: – Random Access Memory (RAM)– Central Processing Unit (CPU)

• Output: Monitor, Printer

• Secondary Storage: Disk Drive

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Random Access Memory (RAM)

• Stores program instructions and data needed for processing.

• Stores intermediate and final results of processing.

• Contents are erased when computer is turned off or reset.

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Programming Languages:

• Machine Language

• High level Language

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Machine Language

• The fundamental language of the computer’s processor, also called Low Level Language.

• All programs are converted into machine language before they can be executed.

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High Level Language

• Computer (programming) languages that are easier to learn.

• Uses English like statements.

• Examples are C++, Visual Basic, and Java

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Software:

• Instructions for the hardware.

• A collection of instructions is called a program.

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Using Windows

• Basic techniques to use the mouse:– Pointing– Clicking– Dragging– Double-Clicking– Hovering

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Key Terms in using Windows

• Title Bar

• Active window

• Dragging a window

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Using Windows

– Reviewing Notepad to learn more about Windows applications

– Notepad is an item in the Accessories menu

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Files & Folders:

• A disk can store thousands of files.• To organize your files you have to store them in

different folders (directories).• File name consists of letters, digits, periods and

other assorted characters.• The following character cannot be used in a file or

folder name /, \, ?, *, :, ”, <, >, |• A File name can contain up to 215 characters

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Key Terms in using Folders

• Root folder

• Path: A nested sequence of folders– Example: A:\Temp\MyProjects\

• File Specification: A drive letter, path, and filename– Example: A:\Temp\MyProjects\Example.vbp

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History of Visual Basic:

• BASIC stands for Beginner’s All-purpose Symbolic Instruction Code.

• BASIC was developed by John Kemeny and Thomas Kurtz in mid-1960s.

• Visual Basic was released in 1991 by the Microsoft Corporation.

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Introduction to Visual Basic:

• A language used to create windows applications.

• Programs are developed with a Graphical User Interface or GUI.

• The instructions executed in the program are controlled by events.

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Terminology used in Visual Basic:

• Form

• Control

• Object

• Properties

• Event

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Steps to Design a Visual Basic Application

• Design the appearance of the window that the user sees.

• Determine the events that the controls on the window should recognize.

• Write the event procedures for those events.