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(10), an error will occur.
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