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A character constant consists of a string of characters enclosed in
a pair of apostrophes which act as quotation marks. Within the
quoted string any characters available in the character set of the
machine are permitted; the blank (or space) character is significant
within character constants and counts as a single character just like
any other. Examples of valid character constants are:
' 40 + 15%'
'This is a constant including spaces'
The apostrophe character can be included in a character constant
by representing it as two successive apostrophes (with no
intervening blanks). This pair of apostrophes only counts as a
single character for the purposes of computing the length of the
string. For example:
'DON''T' is a constant of length 5.