On: ASCII animated donut in obfuscated C

[enneff]

It's not at all complicated. Most of it is a string literal.

This is an assignment to index o of the array b

    b[0] =

this is the string

     ".,-~:;=!*#$@"

and this is indexing into the string literal with N, or 0 if N is less than 0.

     [N > 0 ? N : 0]