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