The GNU Fortran Compiler: SELECTED_INT_KIND

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### 9.238 `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