The character data type, CHARACTER, which has the synonym, CHARACTER*1, holds one character.
The character is enclosed in apostrophes (') or quotes ("). @ Allowing quotes (") is nonstandard; if you compile with the -xl option, quotes mean something else, and you must use apostrophes to enclose a string.
The data of type CHARACTER is always unsigned. A CHARACTER item occupies 1 byte (8 bits) of storage and is aligned on 1-byte boundaries.