Q Basic

Beginner's Programming Tutorial in QBasic
This document is meant to get you started into programming, and assumes you have some experience with computers and with Windows 95 (or 98, etc.). Since this tutorial is written for people who don't like to read a lot of text, it includes a number of examples. Therefore, you can do a lot of work in not much time. The more important chapters have a star ().
Feel free to distribute this tutorial, upload it to your website, link to it from your site, etc. http://www.geocities.com/progsharehouse/qbtutor Mirror: http://development.freeservers.com/qbtutor

Table of Contents
Part I: Q-Basics
Chapter 1: Before you start Chapter 2: Your first program Chapter 3: Variables Chapter 4: Retrieving keyboard input from the user Chapter 5: The IF and THENcommands Chapter 6: Labels and the GOTO and GOSUB commands Chapter 7: Loops Chapter 8: What next?

Part II: Intermediate topics
Chapter 9: QBasic interface Chapter 10: Adding documentation to your programs Chapter 11: Reading and writing to files Chapter 12: Displaying graphics Chapter 13: Mathematics functions Chapter 14: Getting the current date and time

Part III: Advanced topics
Chapter15: Arrays Chapter 16: Variable types Chapter 17: Subroutines and functions Chapter 18: Numbering systems Chapter 19: Memory

Before you start
Before you can create a program in QBasic, you need the QBasic interpreter. It is available from your Windows 95 (or 98) CD, or you can download it below. To access QBasic from the Windows 95 CD:
1. Insert the CD into your CD-ROM drive. 2. Click"browse this CD" (if the menu screen doesn't come up, then browse the CD from My Computer. 3. Go to the \OTHER\OLDMSDOS directory. 4. Open a program called QBASIC.EXE (this is version 1.1 of the QBasic interpreter).

To access QBasic from the Windows 98 CD:
1. Insert the CD into your CD-ROM drive. 2. Click "browse this CD" (if the menu screen doesn't come up, then browse the CD from My Computer. 3.Go to the \TOOLS\OLDMSDOS directory. 4. Open a program called QBASIC.EXE (this is version 1.1 of the QBasic interpreter).

Download it here (right-click and press "Save As"):
QBASIC.ZIP (323 KB) - QBasic 1.1 interpreter and sample programs UNZIP32.EXE (90 KB) - Extracts the ZIP file

To unzip the QBASIC.ZIP file with UNZIP32.EXE:
a. Go to the Start Menu b. Click Run... c. Type the following(this loads MS-DOS): command

d. Enter the following in DOS (assuming you saved QBASIC.ZIP to C:\QBASIC): cd c:\qbasic unzip32 -n qbasic.zip

Your first program
After launching the QBasic interpreter (see before you start), you might see a window requesting a list of "parameters." If this window comes up, press the Enter key to continue. You should now see the QBasic interpreter, which has ablue background and displays a dialog box at the center. (If the interpreter fills the entire screen, then you may want to press "Alt + Enter," to make it smaller.) Press the Esc key to hide the dialog box.

QBasic interpreter - main screen Type the following (including the quotation marks) in the QBasic interpreter: PRINT "Hello World!"

Now press F5 to run the program. You should now see ablack screen, with Hello World at the top, and Press any key to continue at the bottom. Press a key on the keyboard to return to the main screen.

(The figure below displays the "output screen.")

QBasic interpreter - output screen If you run the program again, the interpreter adds another Hello World. QBasic adds Hello World each time the program is run.

Deleting the program
To erasethe current program: 1. Go to the "File" menu. 2. Click "New." 3. The interpreter asks if you want to save the program. 4. Select "No" (or if you'd rather keep the program, select "Yes").

Strings
There are certain types of data (or information) called "strings." Strings contain a sequence of characters (letters, numbers, and symbols) enclosed in quotation marks. For example, "Hello World!" is...