program main

!*****************************************************************************80
!
!! machar_test() tests machar().
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    01 June 2007
!
!  Author:
!
!    John Burkardt
!
  implicit none

  call timestamp ( )
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'machar_test():'
  write ( *, '(a)' ) '  Fortran90 version'
  write ( *, '(a)' ) '  Test machar().'

  call r4_machar_test ( )
  call r8_machar_test ( )
!
!  Terminate.
!
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'machar_test():'
  write ( *, '(a)' ) '  Normal end of execution.'
  write ( *, '(a)' ) ' '
  call timestamp ( )

  stop 0
end
subroutine r4_machar_test ( )

!*****************************************************************************80
!
!! R4_MACHAR_TEST tests R4_MACHAR.
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    08 June 2012
!
!  Author:
!
!    John Burkardt
!
  implicit none

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

  real ( kind = rk ) eps
  real ( kind = rk ) epsneg
  integer ibeta
  integer iexp
  integer irnd
  integer it
  integer machep
  integer maxexp
  integer minexp
  integer negep
  integer ngrd
  real ( kind = rk ) xmax
  real ( kind = rk ) xmin

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'R4_MACHAR_TEST'
  write ( *, '(a)' ) '  R4_MACHAR computes single'
  write ( *, '(a)' ) '  precision machine constants.'

  call r4_machar ( ibeta, it, irnd, ngrd, machep, negep, iexp, &
    minexp, maxexp, eps, epsneg, xmin, xmax )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  IBETA is the internal base for machine arithmetic.'
  write ( *, '(a,i8)' ) '    IBETA =  ', ibeta
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  IT is the number of digits, base IBETA, in the'
  write ( *, '(a)' ) '  floating point significand.'
  write ( *, '(a,i8)' ) '    IT =     ', it
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  IRND reports on floating point addition rounding:'
  write ( *, '(a)' ) '  0, for chopping;'
  write ( *, '(a)' ) '  1, for non-IEEE rounding;'
  write ( *, '(a)' ) '  2, for IEEE rounding;'
  write ( *, '(a)' ) '  3, for chopping with partial underflow;'
  write ( *, '(a)' ) '  4, for non-IEEE rounding with partial underflow.'
  write ( *, '(a)' ) '  5, for IEEE rounding with partial underflow.'
  write ( *, '(a,i8)' ) '    IRND =   ', irnd
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  NGRD is the number of guard digits for floating point'
  write ( *, '(a)' ) '  multiplication with truncating arithmetic.'
  write ( *, '(a,i8)' ) '    NGRD =   ', ngrd
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  MACHEP is the largest negative integer such that'
  write ( *, '(a)' ) '  1.0 < 1.0 + BETA^MACHEP.'
  write ( *, '(a,i8)' ) '    MACHEP = ', machep
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  NEGEPS is the largest negative integer such that'
  write ( *, '(a)' ) '  1.0 - BETA^NEGEPS < 1.0:'
  write ( *, '(a,i8)' ) '    NEGEP =  ', negep
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  IEXP is the number of bits reserved for the exponent'
  write ( *, '(a)' ) '  of a floating point number:'
  write ( *, '(a,i8)' ) '    IEXP =   ', iexp
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  MINEXP is the most negative power of BETA such that'
  write ( *, '(a)' ) '  BETA^MINEXP is positive and normalized.'
  write ( *, '(a,i8)' ) '    MINEXP = ', minexp
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  MAXEXP is the smallest positive power of BETA that'
  write ( *, '(a)' ) '  overflows:'
  write ( *, '(a,i8)' ) '    MAXEXP = ', maxexp
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  EPS is a small positive floating point number'
  write ( *, '(a)' ) '  such that 1.0 < 1.0 + EPS.'
  write ( *, '(a,e26.16)' ) '    EPS    = ', eps
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  EPSNEG is a small positive floating point number'
  write ( *, '(a)' ) '  such that 1.0 - EPSNEG < 1.0.'
  write ( *, '(a,e26.16)' ) '    EPSNEG = ', epsneg
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  XMIN is the smallest positive normalized floating'
  write ( *, '(a)' ) '  point power of the radix:'
  write ( *, '(a,e26.16)' ) '    XMIN =   ', xmin
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  XMAX is the largest finite floating point number:'
  write ( *, '(a,e26.16)' ) '    XMAX   = ', xmax

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  Repeat floating point data using * format:'
  write ( *, '(a)' ) ' '
  write ( *, * ) '    EPS    = ', eps
  write ( *, * ) '    EPSNEG = ', epsneg
  write ( *, * ) '    XMIN   = ', xmin
  write ( *, * ) '    XMAX   = ', xmax

  return
end
subroutine r8_machar_test ( )

!*****************************************************************************80
!
!! R8_MACHAR_TEST tests R8_MACHAR.
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    08 June 2012
!
!  Author:
!
!    John Burkardt
!
  implicit none

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

  real ( kind = rk ) eps
  real ( kind = rk ) epsneg
  integer ibeta
  integer iexp
  integer irnd
  integer it
  integer machep
  integer maxexp
  integer minexp
  integer negep
  integer ngrd
  real ( kind = rk ) xmax
  real ( kind = rk ) xmin

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'R8_MACHAR_TEST'
  write ( *, '(a)' ) '  R8_MACHAR computes double'
  write ( *, '(a)' ) '  precision machine constants.'

  call r8_machar ( ibeta, it, irnd, ngrd, machep, negep, iexp, &
    minexp, maxexp, eps, epsneg, xmin, xmax )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  IBETA is the internal base for machine arithmetic.'
  write ( *, '(a,i8)' ) '    IBETA =  ', ibeta
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  IT is the number of digits, base IBETA, in the'
  write ( *, '(a)' ) '  floating point significand.'
  write ( *, '(a,i8)' ) '    IT =     ', it
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  IRND reports on floating point addition rounding:'
  write ( *, '(a)' ) '  0, for chopping;'
  write ( *, '(a)' ) '  1, for non-IEEE rounding;'
  write ( *, '(a)' ) '  2, for IEEE rounding;'
  write ( *, '(a)' ) '  3, for chopping with partial underflow;'
  write ( *, '(a)' ) '  4, for non-IEEE rounding with partial underflow.'
  write ( *, '(a)' ) '  5, for IEEE rounding with partial underflow.'
  write ( *, '(a,i8)' ) '    IRND =   ', irnd
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  NGRD is the number of guard digits for floating point'
  write ( *, '(a)' ) '  multiplication with truncating arithmetic.'
  write ( *, '(a,i8)' ) '    NGRD =   ', ngrd
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  MACHEP is the largest negative integer such that'
  write ( *, '(a)' ) '  1.0 < 1.0 + BETA^MACHEP.'
  write ( *, '(a,i8)' ) '    MACHEP = ', machep
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  NEGEPS is the largest negative integer such that'
  write ( *, '(a)' ) '  1.0 - BETA^NEGEPS < 1.0:'
  write ( *, '(a,i8)' ) '    NEGEP =  ', negep
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  IEXP is the number of bits reserved for the exponent'
  write ( *, '(a)' ) '  of a floating point number:'
  write ( *, '(a,i8)' ) '    IEXP =   ', iexp
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  MINEXP is the most negative power of BETA such that'
  write ( *, '(a)' ) '  BETA^MINEXP is positive and normalized.'
  write ( *, '(a,i8)' ) '    MINEXP = ', minexp
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  MAXEXP is the smallest positive power of BETA that'
  write ( *, '(a)' ) '  overflows:'
  write ( *, '(a,i8)' ) '    MAXEXP = ', maxexp
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  EPS is a small positive floating point number'
  write ( *, '(a)' ) '  such that 1.0 < 1.0 + EPS.'
  write ( *, '(a,e26.16)' ) '    EPS    = ', eps
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  EPSNEG is a small positive floating point number'
  write ( *, '(a)' ) '  such that 1.0 - EPSNEG < 1.0.'
  write ( *, '(a,e26.16)' ) '    EPSNEG = ', epsneg
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  XMIN is the smallest positive normalized floating'
  write ( *, '(a)' ) '  point power of the radix:'
  write ( *, '(a,e26.16)' ) '    XMIN =   ', xmin
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  XMAX is the largest finite floating point number:'
  write ( *, '(a,e26.16)' ) '    XMAX   = ', xmax
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  Repeat floating point data using * format:'
  write ( *, '(a)' ) ' '
  write ( *, * ) '    EPS    = ', eps
  write ( *, * ) '    EPSNEG = ', epsneg
  write ( *, * ) '    XMIN   = ', xmin
  write ( *, * ) '    XMAX   = ', xmax

  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:
!
!    06 August 2005
!
!  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