What is the difference between char and unsigned char?

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Dig The Code

(Edited change C/C++ to C)

Please help me to find out a clean clarification on char and unsigned char in C. Specially when we transfer data between embedded devices and general PCs (The difference between buffer of unsigned char and plain char).

Mike Seymour

You're asking about two different languages but, in this respect, the answer is (more or less) the same for both. You really should decide which language you're using though.

Differences:

they are distinct types
it's implementation-defined whether char is signed or unsigned

Similarities:

they are both integer types
they are the same size (one byte, at least 8 bits)

If you're simply using them to transfer raw byte values, with no arithmetic, then there's no practical difference.

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edited at2021-02-7

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