multiple assignment of ax

[dezashibi]

Hello

I noticed this question seemed to be asked before in Chinese but unfortunately I couldn't get precise translation of the answers, why we need to do ax = *(char *)*sp++ = ax; while if we remove ax = from the beginning the answer should not change, please correct me if I'm wrong, why we need this? thanks

[lotabout]

No big difference, you could remove the first assignment.

[BreakingLead]

but why do this?