8.90 SELECTED_INT_KIND — Choose integer kind

Description:

SELECTED_INT_KIND(I) return the kind value of the smallest integer type that can represent all values ranging from -10^I (exclusive) to 10^I (exclusive). If there is no integer kind that accomodates this range, SELECTED_INT_KIND returns -1.

Option:

f95

Class:

transformational function

Syntax:

J = SELECTED_INT_KIND(I)

Arguments:

I	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