Doubts on underlying type of integer constant expressions.

[misra cpp]

Question 1:
The underlying type of "RED + 1" is the enum type. The comment on Page 60 does not apply to enums.

Question 2:
The underlying type of "1L" is indeed signed char. We will consider changing this to improve compatibility with MISRA C:2012.

Question 3:
The underlying type of "1UL" is unsigned char, so "-1UL" violates Rule 5-3-2.