8-bit unsigned integers can use an alternative literal notation that
is useful when working with ASCII character codes. Printable
character codes can be denoted with
Non-printable characters can be expressed using escape-sequences. The allowed sequences are:
New-line character (ASCII 012).
Tab character (ASCII 011).
The backslash character.
Character whose ASCII code is the specified number, in octal.
'o' '\n' '\t' '\\' '\0'
The type of a character literal is always