circular pointer in array

screenShot

How to get the "n"th position in an array from a given key position in circular clockwise or anticlockwise?

say you have an array of english alphabet a-z and I am at pointer 's'. from there I want to go upwards by 10 reaching 'c'.
same way -5 from 'b' to reach 'x'

I can do it using if condition when the "addition" or "subtraction" reaches negative or higher than 25 elements, but I need a better solution than that.

Thanks,
JB

Weedpacket

Sounds like you want the modulus operator.

screenShot

How's "modulus operator" going to help me? I want to iterate through an array in a "circular" way.

laserlight

Hint: modular arithmetic is also known as clock arithmetic, and this is related to the fact that the hands on a typical analogue clock move in a circular fashion such that the number after 12 is 1.

dalecosp

I suppose a further hint would be that JB's magic modulus number would be equal to:

count($jbs_array);