The Lbl command is used together with the Goto command to jump or branch to another place in a program. When the calculator executes a Goto command, it stores the label name in memory, and then searches from the beginning of the program for the Lbl command with the supplied name.
Of course, you should use all of the single character names first, before using the two character names. While you can technically have the same label name multiple times in a program, it is rather pointless since the calculator always goes to the first occurrence of the label. You can position a Lbl command one or more lines before a Goto command to create a kind of loop structure.
However, you have to provide the break-out code, since it isn't built-in. An If conditional is easiest, but if there is no code that ends the branching, then program execution will continue indefinitely, until you manually exit it by pressing the ON key.
This is because it has several serious drawbacks associated with it:. They aren't all bad, however, and are actually useful when a loop isn't practical and when something only happens once or twice.
Just remember that you should never use Goto to repeat a block of code several times. While Y is less than or equal to 16, make the value of X equal to 1. Add 1 to the value of X and repeat until X hits 8, at which point continue the outer loop and set X back to 1. Also add 1 to Y. Therefore, this column of X's is displayed over and over again, with the Y becoming 1 larger each time a column is completed, until Y hits 16 and the program ends. If you code While 1, the operation within this while loop will be repeated forever, unless a command is in place to stop it, for example if the user presses ENTER then the loop stops.
If you code While 0, the code between this and End will not execute. This is because computers rely on bits, tiny jolts of electricity, to transfer information. A small voltage stands for 1, and no voltage stands for 0. Therefore, 1 stands for True, because there is a current present, and 0 stands for False, because there is no current. A good way to represent this is a light switch: when it's on, there is a current, and when it's off, there is no current.
So when you code While 1, what you are actually saying is While True. Compare This Following is an example for a bit more advanced use of the FOR function, you will find yourself using this much more often than the previous bit of code. Some of the other functions used here are explained later in this tutorial. These programs are exactly the same visually, although what really goes on behind the scenes is drastically different.
Please run all three of these programs on your TI, in order to see the differences e. I will try my best to explain the behavior of these programs. A circle is drawn at the coordinates 0,0 in the center of the screen. Its radius is set to 0. The text "DONE" is then displayed. While X is less than 50, A circle is drawn at the coordinates 0,0 with a radius of X.
When this happens, 'DONE' is displayed. The following is assigned to frame 1: a circle is drawn at 0,0 with a radius of X. If X is equal to 50, the calculator is told to scan the program for a frame labeled 2; otherwise scan for a frame labeled 1 and go there.
The OR command compares the value to many variables. However, these are usually inefficient commands. They are used in conjunction with input, but they collect lines of text, like 'Mary had a little lamb'. This is sometimes used for moving a character or for menus. If neither is pressed, nothing is done. The END command tells the FOR loop to repeat with 1 more than its previous, but since this loop is supposed to end when its value is 1, the program ends.
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