DBLE — Double conversion functionDBLE(A) Converts A to double precision real type.
     RESULT = DBLE(A)
     | A | The type shall be INTEGER, REAL,
or COMPLEX.
      | 
          program test_dble
              real    :: x = 2.18
              integer :: i = 5
              complex :: z = (2.3,1.14)
              print *, dble(x), dble(i), dble(z)
          end program test_dble