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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 machines byte-wide code for that character. as
assumes your character code is ASCII: 'A means 65, 'B means 66, and so on.