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Q exponent-letter
GNU Fortran accepts real literal constants with an exponent-letter
of Q, for example, 1.23Q45. The constant is interpreted
as a REAL(16) entity on targets that suppports this type. If
the target does not support REAL(16) but has a REAL(10)
type, then the real-literal-constant will be interpreted as a
REAL(10) entity. In the absence of REAL(16) and
REAL(10), an error will occur.