Is the character set of a char literal guaranteed to be ASCII?

Question

Coming from a discussion started here, does the standard specify values for characters? So, is \'0\' guaranteed to be 48? That\'s what ASCII would tell us, but

Answer 1

No, the Standard is very careful not to specify what the source character encoding is.

C and C++ compilers run on EBCDIC computers too, you know, where '0' != 0x30.

However, I believe it is required that '1' == '0' + 1.