File: elemental_02.f90

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program elemental_02

real :: x(2) = [1, 2], y(2) = [1.0, 2.1]
logical :: close(2)
close = is_close(x, y)
print *, close
if (.not. close(1)) error stop
if (close(2)) error stop

contains
elemental logical function is_close(a, b, rel_tol) result(close)
real, intent(in) :: a, b
real, intent(in), optional :: rel_tol
close = abs(a - b) <= 1e-9
end function is_close

end program elemental_02