program main

!*****************************************************************************80
!
!! asa245_test() tests asa245().
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    25 September 2014
!
!  Author:
!
!    John Burkardt
!
  implicit none

  call timestamp ( )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'asa245_test():'
  write ( *, '(a)' ) '  FORTRAN90 version'
  write ( *, '(a)' ) '  Test asa245().'

  call test01 ( )
  call test02 ( )
  call test03 ( )
!
!  Terminate.
!
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'asa245_test():'
  write ( *, '(a)' ) '  Normal end of execution.'
  write ( *, '(a)' ) ' '
  call timestamp ( )

  stop 0
end
subroutine test01 ( )

!*****************************************************************************80
!
!! test01() tests alngam().
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    13 January 2008
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer, parameter :: rk = kind ( 1.0D+00 )

  real ( kind = rk ) alngam
  real ( kind = rk ) fx
  real ( kind = rk ) fx2
  integer ifault
  integer n_data
  real ( kind = rk ) x

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'test01():'
  write ( *, '(a)' ) '  alngam() computes the logarithm of the '
  write ( *, '(a)' ) '  Gamma function.  We compare the result'
  write ( *, '(a)' ) '  to tabulated values.'
  write ( *, '(a)' ) ' '
  write ( *, '(a,a)' ) '          X                     ', &
    'FX                        FX2'
  write ( *, '(a,a)' ) '                                ', &
    '(Tabulated)               (ALNGAM)                DIFF'
  write ( *, '(a)' ) ' '

  n_data = 0

  do

    call gamma_log_values ( n_data, x, fx )

    if ( n_data == 0 ) then
      exit
    end if

    fx2 = alngam ( x, ifault )

    write ( *, '(2x,f24.16,2x,g24.16,2x,g24.16,2x,g10.4)' ) &
    x, fx, fx2, abs ( fx - fx2 )

  end do

  return
end
subroutine test02 ( )

!*****************************************************************************80
!
!! test02() tests lngamma().
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    13 January 2008
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer, parameter :: rk = kind ( 1.0D+00 )

  real ( kind = rk ) fx
  real ( kind = rk ) fx2
  integer ier
  real ( kind = rk ) lngamma
  integer n_data
  real ( kind = rk ) x

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'test02():'
  write ( *, '(a)' ) '  lngamma() computes the logarithm of the '
  write ( *, '(a)' ) '  Gamma function.  We compare the result'
  write ( *, '(a)' ) '  to tabulated values.'
  write ( *, '(a)' ) ' '
  write ( *, '(a,a)' ) '          X                     ', &
    'FX                        FX2'
  write ( *, '(a,a)' ) '                                ', &
    '(Tabulated)               (LNGAMMA)                DIFF'
  write ( *, '(a)' ) ' '

  n_data = 0

  do

    call gamma_log_values ( n_data, x, fx )

    if ( n_data == 0 ) then
      exit
    end if

    fx2 = lngamma ( x, ier )

    write ( *, '(2x,f24.16,2x,g24.16,2x,g24.16,2x,g10.4)' ) &
    x, fx, fx2, abs ( fx - fx2 )

  end do

  return
end
subroutine test03 ( )

!*****************************************************************************80
!
!! test03() tests lgamma().
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    25 September 2014
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer, parameter :: rk = kind ( 1.0D+00 )

  real ( kind = rk ) fx
  real ( kind = rk ) fx2
  integer n_data
  real ( kind = rk ) x

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'test03():'
  write ( *, '(a)' ) '  lgamma() computes the logarithm of the '
  write ( *, '(a)' ) '  Gamma function.  '
  write ( *, '(a)' ) '  It may be a built in function for some compilers.'
  write ( *, '(a)' ) '  We compare the result to tabulated values.'
  write ( *, '(a)' ) ' '
  write ( *, '(a,a)' ) '          X                     ', &
    'FX                        FX2'
  write ( *, '(a,a)' ) '                                ', &
    '(Tabulated)               (LGAMMA)                 DIFF'
  write ( *, '(a)' ) ' '

  n_data = 0

  do

    call gamma_log_values ( n_data, x, fx )

    if ( n_data == 0 ) then
      exit
    end if

    fx2 = lgamma ( x )

    write ( *, '(2x,f24.16,2x,g24.16,2x,g24.16,2x,g10.4)' ) &
    x, fx, fx2, abs ( fx - fx2 )

  end do

  return
end
subroutine timestamp ( )

!*****************************************************************************80
!
!! timestamp() prints the current YMDHMS date as a time stamp.
!
!  Example:
!
!    31 May 2001   9:45:54.872 AM
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    18 May 2013
!
!  Author:
!
!    John Burkardt
!
  implicit none

  character ( len = 8 ) ampm
  integer d
  integer h
  integer m
  integer mm
  character ( len = 9 ), parameter, dimension(12) :: month = (/ &
    'January  ', 'February ', 'March    ', 'April    ', &
    'May      ', 'June     ', 'July     ', 'August   ', &
    'September', 'October  ', 'November ', 'December ' /)
  integer n
  integer s
  integer values(8)
  integer y

  call date_and_time ( values = values )

  y = values(1)
  m = values(2)
  d = values(3)
  h = values(5)
  n = values(6)
  s = values(7)
  mm = values(8)

  if ( h < 12 ) then
    ampm = 'AM'
  else if ( h == 12 ) then
    if ( n == 0 .and. s == 0 ) then
      ampm = 'Noon'
    else
      ampm = 'PM'
    end if
  else
    h = h - 12
    if ( h < 12 ) then
      ampm = 'PM'
    else if ( h == 12 ) then
      if ( n == 0 .and. s == 0 ) then
        ampm = 'Midnight'
      else
        ampm = 'AM'
      end if
    end if
  end if

  write ( *, '(i2,1x,a,1x,i4,2x,i2,a1,i2.2,a1,i2.2,a1,i3.3,1x,a)' ) &
    d, trim ( month(m) ), y, h, ':', n, ':', s, '.', mm, trim ( ampm )

  return
end