Variables and Letters

[Budmaster11]

Well first let me explain what I am trying to do as it may help- I am trying to make a program that you can enter text into then it converts those letters into numbers then puts them through a formula then converts the numbers back to letters and displays them, then of course I will also have it do the reverse so that you can unscramble it. Basically in case you havn't figured it out, I am making a code creating program thing...

The problem I am having is converting the letters into numbers. I am just trying to do one letter at a time, but I don't know how to make it read the letter as a letter not a variable. This is basically what I have.

Input "Enter letter",a
If a=a
1->a
If a=b
2->a
...
Disp a
pause

But of course it always displays 1. Because it sees that variable "A"= variable "a". Where I need it to thing Variable Letter "A"= Letter "A" or something like that.

Any help is appreciated, and any help on making it proccess an antire work/phrase/sentence at once would be very helpful.
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[mark]

you might be able to use the "getkey()" command, i havent used it and am not completely sure about how it works, but it allows you to record a numeric code for every key that is pressed, not sure how you would convert it back over

to know how to use it go to page 202 in your manual, or page 825 of the pfd guidebook, which you can get here http://education.ti.com/educationportal/appsdelivery/download/download_select_product.jsp?cid=us&displaymode=G&contentpaneid=17