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Computer Programming In QBasic

Introduction You\'ve probably used computers to play games and to write reports for school It\'s a lot more fun to create your own games to play on the computer This book will help you get started by using QBASIC QBASIC is a programming language With a programming language you can tell the computer what you want it to do

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Beginners Programming Tutorial in QBasic

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 a blue background and displays a dialog box at the center (If the interpreter fills the entire screen then you may w

PDF	8 Introduction To QBASIC QBASIC is a variant of BASIC programming language BASIC was developed by Professor J G Kemeny and Professor T E Kurtz of Dartmouth college New Hampshire USA It was developed as a language for beginners and was implemented in 1965

How do I save a program in QBasic?
Get rid of the previous program by clicking on File, then New on QBASIC's menu. Click on < Ok > when it asks if you want to save the old program now. Try this: CLS INPUT "Enter your name: ", Name$ PRINT "Hello, "; Name$; ". How are you today?" Don't forget the comma (,) between "Enter your name: " and Name$. Remember to save your work.
What is QBASIC programming language?
QBASIC is a variant of BASIC programming language. BASIC was developed by Professor J.G. Kemeny and Professor T. E. Kurtz of Dartmouth college, New Hampshire, USA. It was developed as a language for beginners and was implemented in 1965.
What are the basic commands in QBasic?
QBasic Tutorials: QBasic for Beginners, Chapter 1 - Basic Commands with QBasic: PRINT, Variables, INPUT, GOTO. When you open QBasic, you see a blue screen where you can type your program. Let’s begin with the basic commands that are important in any program. Command PRINT displays text or numbers on the screen. PRINT "My name is Nick."
What is a good site to learn QBasic?
Petes QBasic Site: This site is mostly aimed at people thinking about programming video games in QBasic. The QBasic Page: This is a good site for getting source codes and programs for QBasic. QBasic News: The most recent and up to date news on the QBasic community. QBasic Programming for Kids: A good site for young people to start programming.

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 a blue background and displays a dialog box at the center. (If the interpreter fills the entire screen, then you may w

PRINT "Hello World"

Now press F5 to run the program. You should now see a black 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. QBasic interpreter - output screen If you run the program again, the interpreter adds another Hello World. QBasic adds Hello World each time the progr

Deleting the program

To erase the current program: Go to the "File" menu. Click "New." The interpreter asks if you want to save the program. Select "No" (or if you'd rather keep the program, select "Yes"). pittajarn.lpru.ac.th

Commands

There are also special functions called "commands" (also called "instructions"). A "command" tells the QBasic interpreter to do something. The PRINT command tells the QBasic interpreter to print something to the screen. In this case, the interpreter printed "Hello World". TIP: Instead of typing PRINT, you can enter a question mark. For example: pittajarn.lpru.ac.th

?"Hello World"

With the PRINT command, you can also print numbers to the screen. Delete the current program (unless you already have) and write the following: pittajarn.lpru.ac.th

More about the PRINT command

You can use multiple print statements in your program. pittajarn.lpru.ac.th

Hello World

To place World onto the previous line, place a semi-colon after PRINT "Hello". pittajarn.lpru.ac.th

HelloWorld

Also, if you put a comma instead of a semi-colon on the first line, the program will insert spaces between the two words. pittajarn.lpru.ac.th

PRINT (VARSEG(X) * 65536) + VARPTR(X)

(For more information, see Memory.) As in the programs above, a variable is accessed by calling its name. Variable names can have a combination of letters and numbers. The following are valid variables: Y num pittajarn.lpru.ac.th

Strings

If you add a dollar sign ($) to the end of a variable, the variable is a string. X$ = "Hello World" pittajarn.lpru.ac.th

PRINT X$

Output: Hello World If you try to set a string to a non-string variable, an error occurs. pittajarn.lpru.ac.th

X = "Hello World"

The QBasic interpreter says "Type mismatch" when you try to run the above program. A string can be added to the end of an existing variable string. X$ = "Hello" X$ = X$ + "World" PRINT X$ Output: pittajarn.lpru.ac.th

Retrieving keyboard input from the user

One way to receive input from the keyboard is with the INPUT command. The INPUT command allows the user to enter either a string or a number, which is then stored in a variable. INPUT data$ pittajarn.lpru.ac.th

PRINT data$

When this program is executed, the INPUT command displays a question mark, followed by a blinking cursor. And when you enter text, the program stores that text into the variable data$, which is printed to the screen. TIP: If you place a string and a semi-colon between INPUT and the variable, the program will print the string. pittajarn.lpru.ac.th

INPUT "Enter some text:"; data$

To receive a number, use a non-string variable. INPUT number pittajarn.lpru.ac.th

PRINT number

If you enter text instead of a number, the QBasic interpreter displays an error message ("Redo from start"). Below is another example of the INPUT command: PRINT "Enter some text:" INPUT text$ PRINT "Now enter a number:" INPUT num pittajarn.lpru.ac.th

PRINT text$ PRINT num

TIP: You can have the question mark displayed on the previous line by using a semi-colon. PRINT "Enter some text:"; INPUT text$ ✪ pittajarn.lpru.ac.th

Strings in IFTHEN

So far in this chapter, we've only been dealing with numbers, but you can also use strings with the IF

Hello

You can also compare two variable strings: x$ = "Hello" y$ = "World" pittajarn.lpru.ac.th

Labels and the GOTO and GOSUB commands

The GOTO and GOSUB commands enables you to jump to certain positions in your program. Labels are used to specify what point in the program to continue execution. pittajarn.lpru.ac.th

GOTO

To use GOTO, place a label somewhere in your program, and then enter. pittajarn.lpru.ac.th

GOSUB

The GOSUB command is the same as GOTO, except when it encounters a RETURN statement, the program "returns" back to the GOSUB command. In other words, RETURN continues program execution immediately after the previous GOSUB statement. pittajarn.lpru.ac.th

Loops

"Loops" make it easier to do an action multiple times. There are at least four types of loops: IF

WHILEWEND

The WHILE

NEXT x

Output: (NOTE: This command only works with the DO

Other programming languages

Information about the below programming languages can be found at ProgrammingTutorials.com. pittajarn.lpru.ac.th

C and C++

' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th ' Notice the parentheses around the parameter "num." ' Any variables placed inside the parentheses are set as ' the subroutine's parameters. SUB OutputNumber (num) PRINT num pittajarn.lpru.ac.th

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