QBasic Tutorial 7 - IF Statements - QB64. If statements are used to check conditions in the program. The structure of the if statement is as follows. Programmed Lessons in QBasic This is a gentle introduction to programming using the computer programming language QBasic (sometimes called QBasic).
QBasic Tutorials - QB6. QBasic is a simple to use and learn computer language. QBasic is free and works on most computers. This tutorial will get you started programming in QBasic. In Lesson 1, we saw that PRINT was capable of printing text surrounded by quotes. PRINT is capable of doing a bit more. PRINT is capable of printing calculations too.
Within this tutorial, print formatting will be used to show the user what calculations are being used. The computer can hold data in memory. The programmer must tell the computer what type of data to hold.
Beginner Tutorials: QB TUTORIALS . QBasic interface ESC Programs. The comparison operators used in qbasic are. The next few programs will be taking a look at ways to use the IF statement. 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. Qbasic sample programs pdf The goal of our study is to learn how to write computer programs in QBASIC. Alphabet.these may followed by a digit or letter. Easy Qbasic Search This Blog. Saturday, August 14, 2010. 1)Write a program to enter your name and print it. CLS Input 'Enter you name';n$. The following paragraph requires a computer with QBasic. You can follow the same procedure for the rest of the example programs in.
This is called a data type. It is very important that the data matches the data type of the variable. If the data does not match the data type then a type mismatch occurs. This tutorial will cover getting user input. If statements are used to check conditions in the program. Select- Case statements work like If statements.
The difference is that the Select- Case statement can make the code simpler to read and work with than If statements. This tutorial will show the While loop. This tutorial will show the While Loop.
This tutorial will show the For loop. This tutorial will show how to make a simple calculator program that asks the user for two numbers. This tutorial shows several pitfalls in making random numbers. It is a good idea to practice making random numbers and random number generators on your own.
We will make the classic game Guess My Number. It is a very boring game to play, by today’s standards, but programing the game can be interesting. Arrays hold lists of variables of the same data type. Parallel Arrays are separate arrays that work together. Multi- Dimensional Arrays are several arrays that are combined into one.
Some examples where a 2 dimensional array might be used would be a chess board, grid, and a deck of cards. This tutorial will modify the code made within Tutorial 1. This tutorial will show a different way of loading data into an array. By using READ and DATA, the code can be more compact and easier to read. This tutorial will show how to find the highest and lowest number within an array.
Unfortunately, QBasic. Quick. Basic 4. 5 and QB6. Boolean data types. However, here is three techniques showing how to use Boolean logic within QBasic. By checking the contents of the array, we can prevent duplicate data from entering into the array. This tutorial will show how to manipulate strings. The program will print strings vertically, upside down vertically, and in pieces.
This tutorial will show how find if a word or string is a palindrome. A palindrome is a word or string that is the same printed forwards and backward. Sometimes we need to separate parts of the string. This program will checks each character in the string and separates the characters into letters, numbers and other characters. There are a few ways of making sounds and music in QBasic. This tutorial will show you how to make songs. Screen 1. 3 will be used within this tutorial.
Screen 1. 3 has a resolution of 3. There are several screen that are used within QBasic 1. QB6. 4 can make custom screens. This is the introduction to QBasic drawing.
SCREEN 1. 3 is used within this tutorial. Line, Box, Box Fill, Paint and Circle will be shown. SCREEN 1. 3 is used with in this tutorial. This tutorial is a continuation of Drawing Part 1. This is a continuation of Drawing Part 2. This tutorial focuses on drawing with QB6. This tutorial focuses on drawing with QB6.
This tutorial will show how to move an object (drawn circle) around the screen using keyboard keys. This tutorial will modify the code used within Tutorial 3. To use the arrow keys, we need to know the PC Keyboard Scan Codes for keyboard arrow keys. As programs become more advanced placing all the code in the main program can make the program more difficult to program, maintain, and understand. Slicing the program into sections can help. This tutorial will show how to make a sub in QB6.
When we made subs in the previous tutorials, we needed to use SHARED when using the same variable within a sub. If we do not wish to make shared variables we can pass the values to the sub. Functions are very similar to subs with exception that functions return values back to the part of the program that called the function. Up to this point, all information, used by the programs could not be saved. When the program was closed all information was lost. To keep information saved, in QBasic, text files must be used.
Continuing from Part 1, the next program shows what happens if a file, that does not exist, is opened for input. Continuing from Part 2, this program will open a text file, that contains questions and quiz the student. A text file will be created to save preferences for a program. A text from one text file will be copied into another text file. An identical backup will be made. A type can hold multiple variables.
This tutorial shows how to use an array with a type. Because types can hold multiple variables, a type can be used in place of parallel arrays.
This tutorial shows how to insert a picture in QB6. A picture will move around the screen.
This is a remake of Tutorial 4. Some png images are used to make a simple video game. LTRIM$, RTRIM$, and STR$ functions are use to remove extra spaces from strings and numbers. This tutorial shows how to load multiple images into an array using a loop. The images can be easily displayed from the array.
Installing QBasic. This appendix assumes that you have QBasic on your system. See appendix A if. QBasic was written to run on old Microsoft operating systems, starting with. DOS 5. 0 and does not behave like modern software. At first this can be frustrating. There are many ways to do the things discussed below.
After you have run through. How to Start QBasic. This method uses the DOS window, similar to what is done in Appendix A. There. are other ways to do this using the windows interface. You can navigate with. Windows Navigator to the directory that holds qbasic.
A. On your desktop, click on . Then in the Run dialog box type CMD. OK. A DOS window (sometimes called a command prompt window) starts up. When it. first starts, it will be set up to use a particular part of the hard disk for. QBasic files it may save and read. This is called the default directory.
If you want to save programs to the hard disk, do the optional steps. C. Optional: Change the default directory. C: (or any other disk) by using the CD. D. Optional: make a new directory to hold. You only need to do this once. Call the directory QSOURCE.
Use the MKDIR command: 1. E. Optional: Change to the directory in. QBasic source programs. This might be the directory you.
D). Notice that in the DOS window, uppercase and lower case don't matter. The directory you change to can be in upper. F. Start the QBasic system by typing qbasic: 1. G. The QBasic development window appears: 1.
H. Hit ESCAPE (tap the Esc key) to clear the welcome message. How to Create and Run a Program.
You may have to left- click the mouse in the QBasic window to give it . There should also be a yellow underscore blinking in the upper left.(Note: you will not be able to use your mouse to make selections by clicking. QBasic window. To make selections from the menu. Or you. can use the arrow keys to change the menu selection.
Hit enter to make a selection. Hit tab to move among choices in a dialog box.)(The above may sound really awful. But it is easy after you have done it a.
A. Enter you program by typing on the keyboard. The characters. should appear in the window. The example program is.
PRINT . If you make mistakes, use the arrow keys on the keyboard to move the cursor. Use the delete (Del) key or the backspace key to remove the mistake and enter.
If the system is confused (and does not accept characters or starts showing. Escape key. You may need to do.
B. Run the program by tapping the F5 key (on the top row. The program starts executing statements one by one starting. Hit the Enter key (or any other) to return to the QBasic. D. The first letter of every command on the menu.
C, above). The Run menu. E. The menu shows shortcuts to do the same thing, Shift+F5 or just. F5 alone. The program runs: Since the program was run once before, the first output (the first . Hit return (or any key) to return to the QBasic window. F. Typically at this point you will discover. Repeat steps 2. A, 2.
B, and 2. C until the program. G. To exit QBasic without saving your program: Click on the. X in the upper right corner of the window.
Another way to exit is to use the QBasic menus: hit Alt+F+x . The system will. ask you if you want to save the program, similar to 3. B, below. You know enough now to read the first several chapters of these notes and to. When you start writing your own programs you.
The following sections. How to Save a Program to a Source File A . With a short program, this might not matter. But if you are. creating a program with dozens of statements you should save it to disk as soon. A. Tap the Alt key on the keyboard.
The first letter of every. C, above). Now tap. F key to see the File menu: (In the above picture, the actual program is covered up by the menu.)3. B. If you try to save the program a file that already exists.
You should be sure this is what you want to do before you hit Enter (or Y). You can keep saving the program to the same disk file. S menu choice. It.
If you want to use a NEW file. Save As option. This will bring you back to 3.
C and you can pick a new name for the file. G. Push the down arrow on your keyboard until . You will return to the DOS prompt.
How to Load a Program from a Disk File. You can load QBasic with a program that has been saved as a disk file. A. Start QBasic (if needed). Open the File menu by hitting. Alt+F 4. B. This brings up the open file dialog: 4. C. The dialog shows the QBasic files in the default directory.
You may see many files. To select a file, tap the tab key of your keyboard until the. The program in the file should appear. QBasic window just as it was when you saved it: 5. How to Cut and Paste.
Sometimes you have part of a program you would like to copy to another part. Highlight the lines you wish to copy (or cut) by moving.
Do this with the arrow keys. The mouse will not work for this. Now push and hold down the Shift key and move the cursor over the lines you. The lines will be highlighted: 5. B. Access the Edit menu by hitting Alt+E. Move the menu selection. Copy: Hit Enter. 5.
C. In the program window, move the cursor to where you wish. D. Return to the Edit menu (Alt+E). Move the selection down. Paste. 5. E. The copied line(s) are pasted into the program. End. This is the end of this Appendix.
There is much more to the QBasic system.