QBasic Chapter 1 – Introduction to Computer Systems & QBasic.
-
Upload
raymond-foster -
Category
Documents
-
view
282 -
download
7
Transcript of QBasic Chapter 1 – Introduction to Computer Systems & QBasic.
QBasic
Chapter 1 – Introduction to Computer Systems & QBasic
Introduction
Importance of computers What is a computer? Computer Programs Programming Languages
What Computers Can Do
Arithmetic Operations Comparison (logical) operations Storage & retrieval operations
Speed & Accuracy
Components of a Computer System
Hardware– System Unit– CPU – control unit & arithmetic logic unit– Main Memory
Peripheral Devices– Input– Output
Components of a Computer System
Secondary Storage– Floppy disk, hard drive, CD, DVD, Flash Drive
Secondary Storage Devices– Used to copy data to & from secondary storage
Storage space measured in Bytes– Kilobyte, Megabyte, Gigabyte, Terabyte
Categories of Computer Systems
Supercomputers Mainframes Minicomputers Microcomputers
Where Did All this Start?
Operating System User Interface
– Command-Line Interface– Graphical User Interface
DOS – Disk Operating System– Command-line– Used to run QBasic
QBasic
Designed from the BASIC language Enhanced, menu-driven Online Help Structured language
Running QBasic
Installed on your H: drive Double click on QB.exe Use mouse and arrow keys to navigate Menu Bar
– File - Edit– View - Search– Run - Debug– Options - Help
QBasic
Title Bar Reference Bar Immediate Window
Menus
File– New– Open– Save– Save As– Print– Exit
Menus
View– SUBs– Split– Output Screen
Run– Start– Restart– Continue
Entering & Editing Programs
Use CLS to clear screen at beginning Type commands one line at a time Hit Enter to go to next line Scroll up & down as needed
Key Words in QBasic
CLS INPUT PRINT
– Put text in “double quotes”– Use semi-colon ; between quoted text & variable
names Use $ for text variables
– User$, Instructor$, Title$
Being a Responsible Computer User
Computer Ethics Hardware
– Backup data– Store media properly
Software– Commercial Software– Shareware– Public-domain Software