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

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]