9.208 PRECISION — Decimal precision of a real kind

Description:
PRECISION(X) returns the decimal precision in the model of the type of X.
Standard:
Fortran 95 and later
Class:
Inquiry function
Syntax:
RESULT = PRECISION(X)
Arguments:
X Shall be of type REAL or COMPLEX.
Return value:
The return value is of type INTEGER and of the default integer kind.
See also:
SELECTED_REAL_KIND, RANGE
Example:
program prec_and_range
  real(kind=4) :: x(2)
  complex(kind=8) :: y

  print *, precision(x), range(x)
  print *, precision(y), range(y)
end program prec_and_range

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Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-5.4.0/gfortran/PRECISION.html