QBASIC Chapter 1 - Getting Started. Chapter One. Getting Started. Key. Words: END, LET, PRINTStarting QBASIC. To fully utilize the QBASIC system with all the options makes it quite.
Here is the command in full. QBASIC /B /G /H /MBF /NOHI /RUN ? I know you're thinking ! We will now. tell you the slightly easier way to start QBASIC.
- However, if used on any 8088/8086 computers, or on some 80286 computers, the QBasic program may run very slowly. END IF WEND ' IF won % = 0 THEN PRINT 'You ran.
- The comparison operators used in qbasic are.
- Beginner's All-purpose Symbolic Instruction Code. In QBASIC, END works somewhere in between.
You can load QBasic with a program that has been saved as a disk file. This is the end of this Appendix. Computer Programming In QBasic. To open a QBasic program you must open. You can see the beginning and the end of the DO.LOOP more clearly. How to Download and Install QBasic. QBasic is contained in the two files QBASIC.EXE and QBASIC.HLP. At the end of whatever is there.
Simply type in: QBASIC. Enter. You are now in QBASIC! We will just say that it is for telling. By the way the. Q in QBASIC stands for QUICK. QBASIC was derived from Microsoft's highly. QUICKBASIC compiler series.
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QUICKBASIC. has many more capabilities than QBASIC, and allows much larger programs. C++) and low- level languages (like MACRO ASSEMBLER). I have even. combined all three of those languages into a single program using QUICKBASIC.
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QBasic Tutorial 7 - IF Statements - QB64. If statements are used to check conditions in the program.
QBASIC doesn't cost anything. I really can't complain! Let's take a look at what is on the screen. At the. top, you have a line of words. This is the menu system. We will be using.
Most of the rest of the screen is blue, except for that. Welcome to MS- DOS QBasic, and gives.
Press the ESC key to clear this box. You will see. that the screen is divided into two sections. The top section has a title. Untitled. This is where the program name will appear.
The bottom window has a title of Immediate. The very. bottom line shows a handfull of function key shortcuts, and your cursor. Can you guess what. Well, let's try it and see. First, press the F6 key until the. Immediate (near the bottom of the screen) is highlighted. That will. allow us to type in QBASIC commands directly.
Type in the word. PRINT. (it can be in upper or lower case - the computer doesn't really care). Enter key. It looks like we are viewing the screen. QBASIC command! In fact, we can still. Press. any key to continue.
Go ahead and press any key, and you will be back. QBASIC environment. Let's get this thing to do something a little. Now type. PRINT 4.
ENTER. Notice that there is now a number 4 at the bottom of. That's because we used the print command to print the. It printed. the number 4 on the output screen!
Now type this: PRINT 7. Press the Enter key. Now it printed the number 7 on. Let's see if we can print words. Type this: PRINT LUNCH. ENTER. It didn't print the word lunch, it printed.
This thing must be broken! Why didn't it print out what I told it. Hold on - how did we that it printed a 0 instead of the word lunch? The answer, of course, is. In the above example, the word .
That simply means that it is a name which can represent just. You could call it a storage place for data. For. example, we could assign the word LUNCH to have a value of 1. How do. we do that in QBASIC? That is our second command we will learn. It is. the LET command, and it looks like this for our particular case (go ahead.
LET LUNCH = 1. 0. ENTER key. Hmmmm, It didn't show us the output screen. That means that QBASIC understood the command.
Now type in: PRINT LUNCH. Look at that! It printed out the number 1. Let's try to change the value. Type: LET LUNCH = 4.
No response - good. Now type. PRINT LUNCH. You should get a 4. We can use the same. Of course, when we told LUNCH. A variable. can only hold one thing at a time.
If you tell it to hold something new. It only has one hand. Here we are going to use two numeric variables. Type in this series of lines (press Enter after each. LET ANSWER = FIRST + SECOND.
Did you get what you expected? If everything went correctly, there should. The first two lines you should be familiar. The variable FIRST was assigned a value of 9. The variable SECOND. The variable ANSWER was then given the value of.
SECOND added to the value of FIRST (6+9 in this case). Then the value. of ANSWER was printed.
That third line is where the power of computer. You can put this line in a program.
FIRST and SECOND) happen. Let's look a little closer at the third line. QBASIC. operates on the LET command by solving any math problems that is to the. Algebraic Order of Operations. It simplifies this expression. There can. only be one variable on the left side of the . However, you can have a highly complex.
As long as it can be reduced. All we have been doing. QBASIC's . What that means is QBASIC performs.
Enter. The other mode. QBASIC is (can you believe it?) the . In the program. mode, the instructions or commands we type in are not performed as we. How do we get into the program mode? You will also see the cursor (that flashing underline thing).
Now type this in: LET FIRST = 1. LET THIRD = FIRST + 6.
LET ANSWER = FIRST + SECOND + THIRD. Let's go through this line by line.
Lines 1, 2, and 5, you have seen before. It is straightforward. It adds 6 to the current value of FIRST (1. THIRD. The fourth line simply adds the values. ANSWER. Incidentally. LET. command are not altered.
In other words, the FIRST, SECOND, and THIRD. That is because its value.
QBASIC allows you to define words. For example you. could just type in PI instead of 3. We'll. show you how in the Advanced series. It obviously is the end of.
If there happens to be more program lines after the END command. END tells the computer to stop. Now we need to tell the computer that we want this program to. Take a look at the very bottom of the screen.
You get a 4. 2 as a result. Can. you figure out why? FIRST is 1. 4, SECOND is 8, and THIRD is 2. Now it is your turn to write a few programs.
Then from the pull- down menu, select New either with. N). You will. get a box asking if you want to save the changes. We really don't need.
No. You will then be presented with a clean slate. Introduced In This Chapter: Keywords: END, LET, PRINTConcepts: Constants, Numeric Variables.
QBasic Tutorial 1. Load up QBasic and then press . If you do eliminate the .