PRECISION - The GNU Fortran Compiler
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### 8.194 `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