Look Up Tables

[amateurrobotguy]

First, I would like to say thanks to all the people that give support to me and others on these forumns.

Next, since I can't use math functions, it has been suggested that a look-up table be used. I can make the tables, but how to I read data from them? Like on table 1 find this number. Then from that number, goto table 2 with the same row and find that number.

const int table_length = 18;
rom const int x[]= {0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255};
rom const int y[]= {0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255};

Basically I want something like:

Search x(135)
a=x postition
goto y(a)