I recently read that the differences between

char
unsigned char

and

signed char

is platform specific.
I can't quite get my head round this? does it mean the the bit sequence can vary from one platform to the next ie platform1 the sign is the first bit, platform2 the sign could be at the end? how would you code against this?

Basically my question comes from seeing this line:

typedef unsigned char byte;

I dont understand the relevance of the signage?

c++ signedness
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