Echelon Neuron C - Manual (Page 252)

240 Neuron C Language Implementation Characteristics
Characters (J.3.4)
Q: What are the members of the source and execution character sets beyond
what the standard explicitly defines? (Sec. 5.2.1)
A: The Neuron C character set uses the basic ASCII character encoding for its
source and execution character sets. The Neuron C source character set is the
character set as explicitly defined in the standard. The ASCII carriage return
character (hex 0D) and the ASCII backspace character (hex 08) are both accepted
as white space. The end-of-line character is the ASCII new-line (hex 0A).
Additionally, the Neuron C compiler accepts the remaining basic ASCII printable
characters @ (at-sign) and ` (accent-grave) in character constants and string
literals.
The Neuron C compiler interprets the ASCII EOT character (hex 04) as an end-
of-file marker. Likewise, the character Ctrl-Z (hex 1A), which is the MS-DOS
end-of-text-file character, is an end-of-file marker. However, neither of these
characters is
required by the Neuron C compiler.
The execution character set is intended to be basic ASCII (character values
0 .. 127). However, a program written in Neuron C is free to use any
interpretation of character values outside the range 0 .. 127.
Q: What is the mapping of the members of the source character set (in character
constants and string literals) to members of the execution character set? (Sec.
6.4.4.4, Sec. 5.1.1.2)
A: The mapping from the source character set to the execution character set is
the identity relationship.
Q: What is the value of an integer character constant that contains a character
or an escape sequence not represented in the basic execution character set or the
extended character set for a wide character constant? (Sec. 6.4.4.4)
A: An integer character constant can only contain characters in the basic
execution character set. With escape sequences, character constants can be
constructed ranging from 0 to 255, or if signed chars are used, ranging from -128
(\x80) through 127 (\x7F).
Q: What is the value of an integer character constant that contains more than
one multibyte character? What is the current locale used to convert multibyte
characters into corresponding wide characters (codes) for a wide character
constant? (Sec. 6.4.4.4)
A: The Neuron C compiler does not implement multibyte characters.
Q: Does a “plain” char have the same range of values as signed char or unsigned
char ? (Sec. 6.2.5, Sec. 6.3.1.1)
A: A “plain” char is identical to an unsigned char.
Characters (F.3.4 of ANSI C Standard)
Q: What are the shift states used for the encoding of multibyte characters? (Sec.
2.2.1.2)
A: Neuron C does not support multibyte characters. Character constants
containing more than one character are errors.