as: Chars
3.6.1.2 Characters
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A single character may be written as a single quote immediately followed
by that character. Some backslash escapes apply to characters, '\b',
'\f', '\n', '\r', '\t', and '\"' with the same meaning as for strings,
plus '\'' for a single quote. So if you want to write the character
backslash, you must write ''\\' where the first '\' escapes the second
'\'. As you can see, the quote is an acute accent, not a grave accent.
A newline immediately following an acute accent is taken as a literal
character and does not count as the end of a statement. The value of a
character constant in a numeric expression is the machine's byte-wide
code for that character. 'as' assumes your character code is ASCII:
''A' means 65, ''B' means 66, and so on.
Info Catalog
as: Strings
as: Characters