Barry Kissane
Deleting programs
Programs remain in your calculator until you delete them. They are not affected by turning the calculator off. To permanently delete a program, go to the program list
with 
, and press the continuation key. Use 
and 
to select the program name from the list, and then press 
(
). To delete all the programs in a calculator, choose
.
(
) instead of 
(
).
In case you have pressed any keys by mistake, you then have a second chance to confirm that you do actually want to erase the program. Press 
(
) if you do and any other key or 
(
) if you don't.
Programs can also be deleted from the Memory mode, accessed by 
. In Memory mode, you have a choice of finding out how much calculator memory is being used for various things (Memory Usage) or of resetting the calculator (Reset).
There is also a 
(
) key on the memory usage screen, which you can use to delete all the programs at once, if you wish.
Resetting the calculator manually (with the emergency reset on the back of the calculator) will also delete all the programs. See Appendix A of the User's Guide for details and warnings about this.
If you press the Reset key in error (either in Memory mode or using the reset on the back of the calculator), you still have one last chance to avoid deleting everything: Press
( ) instead of | ( ). |
And, finally …
Using programs like those in this book will allow you to do many powerful things with your calculator.
However, the most powerful use of programming comes when you start to write programs for yourself. The programs in this book are all fairly short, partly to make it easier for you to see how they work. Once you have a good idea of how these programs work, you may like to experiment with writing other programs for yourself.
Some aspects of mathematics are fairly routine, and so lend themselves to programming. An example of this is the quadratic formula, used in program QuadEqtn. Other examples are the formulae used in the Calendar and Heron programs. There are many other formulas in mathematics for which programs can easily be written. These include working out simple interest, compound interest, the area of a circle and the cosine law.
Another aspect of mathematics for which programming is useful involves the use of repetition. You might like to try writing programs to deal with sequences and series, which are of this kind.
Many of the programs in this book make use of the random number generator to simulate probabilities. You might like to try writing other programs that use this calculator feature.