QBASIC code/Editor Screen
(Press key [F5] to make the program RUN/execute...)
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(Pressing any key returns you straight back to the Editor screen; where you can either chose to further Edit/Re-Run/or else, Save your program.)
Here is another example.
CLS
COLOR 15, 4, 14
PRINT "Press any key to continue"
DO WHILE INKEY$ = ""
LOOP
FOR c = 1 TO 20
COLOR c, 0
PRINT "Replace this with the name you want to display"
NEXT c
COLOR 15, 0
END
In QBasic, you can display a new line using the PRINT statement. To create a new line, you can simply use an empty PRINT statement. Here’s a simple example: PRINT "This is the first line." PRINT ' This will create a new line. PRINT "This is the third line." This program will display the first line, then move to a new line, followed by the third line.
To write a program in QBASIC to find the area of a square, you first need to prompt the user to enter the length of one side of the square. You can then calculate the area by squaring the length (multiplying it by itself) and finally display the result. Here's a simple example: INPUT "Enter the length of the side of the square: ", side area = side * side PRINT "The area of the square is: "; area
In QBASIC, you can continue running a program using the shortcut key F5. This key starts the execution of the program from the beginning or resumes it if it was previously paused. If you need to run a specific line, you can use the F8 key to step through the program line by line.
QBASIC keywords are reserved words that have special meanings and functions within the QBASIC programming language. They include commands like PRINT, INPUT, IF, FOR, NEXT, and END, which control the flow of the program and perform specific actions. These keywords cannot be used as variable names, as they are integral to the syntax and operation of QBASIC. Understanding these keywords is essential for writing effective QBASIC programs.
EXAMPLE 1 The QBASIC program will, automatically, *capitalize* any reserved 'keyword' which it finds once you've already gone and typed in a line of code; and, then, at the end of that code line, do finally press the [RETURN/ENTER] key...to confirm what you've just gone and typed in. A keyword might be say the PRINT command statement...so, if I were to type inside of the QBASIC editor the following line of code... print 1+1 ...then, the moment I press the [RETURN/ENTER] key when I get to the end of that line...the QBASIC interpreter program will, automatically, change the 'lower case' word: print...to become all UPPERCASE, instead; QBASIC Editor will display the previous line of code I typed in as being... PRINT 1+1 ...thus, I am able to tell immediately that PRINT is a special reserved 'keyword'/or, command statement which the QBASIC program, quite clearly, recognizes and understands. This also helps me the programmer to know if I actually typed in that 'keyword' either correctly/or, incorrectly; if wrong...and, the program did NOT automatically capitalize it...; then, I know I must have either accidentally 'misspelled' the keyword/or, must otherwise have done something to go get it wrong...?! EXAMPLE 2 If I were to type in to the QBASIC Editor program the following line of code using all 'lower case' letters... x=10: if x=10 then print "ten" else print "NOT ten" ...and, then, when I've reached the end of that line of code, press [RETURN/ENTER] key to confirm my code entry; the QBASIC interpreter program will, automatically, respond by capitalizing any reseved 'keywords' that it finds; then, QBASIC Editor displays the line of code I typed in as being... x=10 : IF x=10 THEN PRINT "ten" ELSE PRINT "NOT ten" Looking at this newly capitalized line...it tells me that... IF/THEN/ELSE/PRINT...are all QBASIC reserved 'keywords'. NOTE: Whatever is a string a text that is written in between double quote marks: ("") will be totally unaffected by such capitalizing; instead, text strings will be printed out, quite literally, 'as is'. FINAL NOTE There are far too many QBASIC 'keywords' for me to go and list here; possibly, a couple hundred...! QBASIC has many 'keywords' that it uses; if you wish to see what ALL of these keywords are; then, from inside of the QBASIC Editor program itself...do a combination key press of: [SHIFT] + [F1]...and, there you will see the Help file...that shows each 'keyword' you can use to write QBASIC programs with; as well as, offering a clear explanation/it shows 'example codes' demonstrating exactly how each of these 'keywords' should be used; just do 'copy & paste'/then, RUN the program to follow these examples along.
you do this 10 print "0112358132134" use the whole of the thing
END '...END of program/halt program code execution. *NOTE*: There should be only 'one' END statement written inside of a QBASIC program. I have seen example code where they use multiple END statements; this is wrong!
In QBasic, you can display a new line using the PRINT statement. To create a new line, you can simply use an empty PRINT statement. Here’s a simple example: PRINT "This is the first line." PRINT ' This will create a new line. PRINT "This is the third line." This program will display the first line, then move to a new line, followed by the third line.
To stop a program from running in QBASIC, you can press "Ctrl" + "Break" on your keyboard. This interrupts the program execution and returns you to the QBASIC command prompt. Alternatively, you can close the QBASIC window to terminate the program. If you want to exit gracefully, you can also use the END statement in your code to stop execution at a specific point.
(1) Immediate mode In this mode, QBASIC performs the command/instruction that we type in immediately after we press the enter key. (2) Program mode In this mode, the instructions/commands we type in are not performed as we type them in, but are first stored in the computer memory as a program. This program can be executed later, at a high speed.
Write a program that calculates the area of a triangle in QBASIC
If you are using windows, MSDOS shell is integrated by default..
To write a program in QBASIC to find the area of a square, you first need to prompt the user to enter the length of one side of the square. You can then calculate the area by squaring the length (multiplying it by itself) and finally display the result. Here's a simple example: INPUT "Enter the length of the side of the square: ", side area = side * side PRINT "The area of the square is: "; area
a triangle then a square :)
QBASIC keywords are reserved words that have special meanings and functions within the QBASIC programming language. They include commands like PRINT, INPUT, IF, FOR, NEXT, and END, which control the flow of the program and perform specific actions. These keywords cannot be used as variable names, as they are integral to the syntax and operation of QBASIC. Understanding these keywords is essential for writing effective QBASIC programs.
H. Tornsdorf has written: 'Windows 3.1 - Trucos y Consejos' 'QBasic for beginners' -- subject(s): QBasic (Computer program language)
In QBasic, the CLS statement stands for "Clear Screen." It is used to clear the current screen of any text or graphics, providing a clean slate for subsequent output. When CLS is executed, all visible content is removed, allowing programmers to refresh the display during a program's execution. This is particularly useful for improving readability and organizing output in console applications.