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2013-09-13T18:04:25.980
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I know this is an old question, but I think this point might still be relevant. If you are using the key input to move a character, or shift a value somehow, you are almost always better off avoiding <code>if-then-else</code> statements. The fastest method is usually to do something like this: <pre><code>:getkey -> A :X+(A=24) -> X :X-(A=26) -> X :Y+(A=25) -> Y :Y-(A=34) -> Y </code></pre> which can be further condensed to: <pre><code>:getkey -> A :X+(A=24)-(A=26) -> X :Y+(A=25)-(A=34) -> Y </code></pre> Instead of dealing with the logic through the <code>if</code> statements, we utilize the fact that the <code>(A=24)</code> has a 'boolean' (0 or 1) value. So we add or subtract 1 if it is a certain value. Setting limits is also fairly easy: <pre><code>:getkey -> A :X+(A=26)(X<=20)-(A=24)(X>0) -> X :Y+(A=25)(Y<=15)-(A=34)(Y>=3) -> Y </code></pre> So if <code>(X<20)</code> it will multiply by 1, but when X>=20, <code>(X<20)</code> will multiply by 0, negating the incriment. I use another technique to help with selecting values in some of my programs: The left and right keys increment and decrement a variable by a different value than the up and down keys do. However, it requires some more logic. <pre><code>:getkey -> A :X+10(A=26)(X+10<=100)-10(A=24)(X-10>=0) -> X :Y+(A=25)(Y<15)-(A=34)(Y>3) -> B </code></pre> In this case, the left and right arrows go by tens, and the up and down go by ones. <code>(X+10<=100)</code> is used instead of <code>(X<100)</code> because the latter will be true if <code>X=99</code> so X can go up to 109. The former makes sure that adding ten will not exceed the limit.
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1. POHow to use the arrow keys in a custom TI program
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