SELECTED_REAL_KIND — Choose real kind#

SELECTED_REAL_KIND(P, R)#

SELECTED_REAL_KIND(P,R) returns the kind value of a real data type with decimal precision of at least P digits, exponent range of at least R, and with a radix of RADIX.

Parameters

P – (Optional) shall be a scalar and of type INTEGER.
R – (Optional) shall be a scalar and of type INTEGER.
RADIX – (Optional) shall be a scalar and of type INTEGER.

Returns

SELECTED_REAL_KIND returns the value of the kind type parameter of a real data type with decimal precision of at least P digits, a decimal exponent range of at least R, and with the requested RADIX. If the RADIX parameter is absent, real kinds with any radix can be returned. If more than one real data type meet the criteria, the kind of the data type with the smallest decimal precision is returned. If no real data type matches the criteria, the result is

Standard:

Fortran 90 and later, with RADIX Fortran 2008 or later

Class:

Transformational function

Syntax:

RESULT = SELECTED_REAL_KIND([P, R, RADIX])

Example:

program real_kinds
  integer,parameter :: p6 = selected_real_kind(6)
  integer,parameter :: p10r100 = selected_real_kind(10,100)
  integer,parameter :: r400 = selected_real_kind(r=400)
  real(kind=p6) :: x
  real(kind=p10r100) :: y
  real(kind=r400) :: z

  print *, precision(x), range(x)
  print *, precision(y), range(y)
  print *, precision(z), range(z)
end program real_kinds