Is char signed or unsigned by default?

Question

In the book \"Complete Reference of C\" it is mentioned that char is by default unsigned.

But I am trying to verify this with GCC as well as Visual Stud

Answer 1

According to the C standard the signedness of plain char is "implementation defined".

In general implementors chose whichever was more efficient to implement on their architecture. On x86 systems char is generally signed. On arm systems it is generally unsigned (Apple iOS is an exception).