SELECTED_INT_KIND - The GNU Fortran Compiler
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### 8.216 `SELECTED_INT_KIND` — Choose integer kind

Description:
  `SELECTED_INT_KIND(R)` return the kind value of the smallest integer type that can represent all values ranging from -10^R (exclusive) to 10^R (exclusive). If there is no integer kind that accommodates this range, `SELECTED_INT_KIND` returns -1.
Standard:
  Fortran 95 and later
Class:
  Transformational function
Syntax:
  `RESULT = SELECTED_INT_KIND(R)`
Arguments:

  R | Shall be a scalar and of type `INTEGER`.

Example:

                program large_integers
                  integer,parameter :: k5 = selected_int_kind(5)
                  integer,parameter :: k15 = selected_int_kind(15)
                  integer(kind=k5) :: i5
                  integer(kind=k15) :: i15

                  print *, huge(i5), huge(i15)

                  ! The following inequalities are always true
                  print *, huge(i5) >= 10_k5**5-1
                  print *, huge(i15) >= 10_k15**15-1
                end program large_integers