## Computer Scientists? - Building logic addition circuit with MAX

Apr 17 2006 | 8:37 pm
Hello all,
I am beginning to learn the Max environment for an introductory computer science course. My teacher doesn't use Max, so I am hoping someone here might be able to help (I am learning Max so I can use it with my artwork - teleo!!!)... I am trying to build an addition circuit using logic gates (&&, ||, and external notX(attached)). My problems is that I do not have a great handle on the whole right-to-left thing, and can't get the outputs correct with only one 'bang' - I have commented everything in the patch to explain the problem more clearly. Your help is GREATLY appreciated!! thanks much, tr
ps: Thanks to opendragon.com for notX external

• Apr 18 2006 | 5:46 am
It's a right-to-left precedence problem. For instance the last && of (5) gets its left input from the rightmost notX, so it makes the calculation before getting its second operator (which is obviously not good). I suggest you to collect A B and C in a list (using [pack 0 0 0]), and recreate the boolean calculations for (1, 2, 3, etc.) in eight expr objects (see the help file) and give the A B C list to each expr object. For instance the expr for (8) would be [expr \$i1 && \$i2 && \$i3], the expr for (7) woud be [expr \$i1 && \$i2 && ! \$i3] (provided you have packed A B and C in alphabetic order, not C B and A).
m
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• Apr 19 2006 | 1:08 am
Thanks for the advice! I will try this out. tr