Fortran Wiki
selected_int_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