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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.

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QBasic

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  1. QBasic Chapter 1 – Introduction to Computer Systems & QBasic

  2. Introduction • Importance of computers • What is a computer? • Computer Programs • Programming Languages

  3. What Computers Can Do • Arithmetic Operations • Comparison (logical) operations • Storage & retrieval operations • Speed & Accuracy

  4. Components of a Computer System • Hardware • System Unit • CPU – control unit & arithmetic logic unit • Main Memory • Peripheral Devices • Input • Output

  5. 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

  6. Categories of Computer Systems • Supercomputers • Mainframes • Minicomputers • Microcomputers

  7. 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

  8. QBasic • Designed from the BASIC language • Enhanced, menu-driven • Online Help • Structured language

  9. 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

  10. QBasic • Title Bar • Reference Bar • Immediate Window

  11. Menus • File • New • Open • Save • Save As • Print • Exit

  12. Menus • View • SUBs • Split • Output Screen • Run • Start • Restart • Continue

  13. 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

  14. 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$

  15. Being a Responsible Computer User • Computer Ethics • Hardware • Backup data • Store media properly • Software • Commercial Software • Shareware • Public-domain Software

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