File: modules_56.f90

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module modules_56_module
contains
    logical function is_close_rsp(a) result(res)
        use, intrinsic :: ieee_arithmetic, only: ieee_is_nan
        real, intent(in) :: a
        res = ieee_is_nan(a)
    end function is_close_rsp
end module

program main
    use modules_56_module
    implicit none
    real :: a
    logical :: res

    a = 0.0  ! Initialize the variable 'a'
    res = is_close_rsp(a)
    print *, res
    if (res) error stop
end program main