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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 support 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.