program main 

!*****************************************************************************80
!
!! line_grid_test() tests line_grid().
!
!  Licensing:
!
!    This code is distributed under the MIT license. 
!
!  Modified:
!
!    31 August 2014
!
!  Author:
!
!    John Burkardt
!
  implicit none

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

  call timestamp ( )
  write ( *, '(a)' ) ''
  write ( *, '(a)' ) 'line_grid_test():'
  write ( *, '(a)' ) '  Fortran90 version'
  write ( *, '(a)' ) '  Test LINE_GRID().'

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

  stop 0
end
subroutine test01 ( )

!*****************************************************************************80
!
!! TEST01 tests LINE_GRID using simple parameters.
!
!  Licensing:
!
!    This code is distributed under the MIT license. 
!
!  Modified:
!
!    31 August 2014
!
!  Author:
!
!    John Burkardt
!
  implicit none

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

  integer, parameter :: n = 11

  real ( kind = rk ), parameter :: a = -1.0D+00
  real ( kind = rk ), parameter :: b = +1.0D+00
  integer, parameter :: c = 1
  real ( kind = rk ) x(n)

  write ( *, '(a)' ) ''
  write ( *, '(a)' ) 'TEST01'
  write ( *, '(a)' ) '  Create a grid using LINE_GRID.'
  write ( *, '(a)' ) '  Use simple parameters.'
  write ( *, '(a,i4)' ) '  Number of grid points N = ', n
  write ( *, '(a)' ) ''
  write ( *, '(a)' ) '     N      C      A         B'
  write ( *, '(a)' ) ''
  write ( *, '(2x,i4,2x,i4,2x,f8.4,2x,f8.4)' ) n, c, a, b

  call line_grid ( n, a, b, c, x )
  call r8vec_print ( n, x, '  Grid points:' )

  return
end
subroutine test02 ( )

!*****************************************************************************80
!
!! TEST02 changes the number of points.
!
!  Licensing:
!
!    This code is distributed under the MIT license. 
!
!  Modified:
!
!    31 August 2014
!
!  Author:
!
!    John Burkardt
!
  implicit none

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

  real ( kind = rk ), parameter :: a = 0.0D+00
  real ( kind = rk ), parameter :: b = 1.0D+00
  integer, parameter :: c = 2
  integer n
  integer test
  real ( kind = rk ), allocatable :: x(:)

  write ( *, '(a)' ) ''
  write ( *, '(a)' ) 'TEST02'
  write ( *, '(a)' ) '  Create a grid using LINE_GRID.'
  write ( *, '(a)' ) '  Try an increasing number of points.'

  n = 4

  do test = 1, 3

    n = 2 * n + 1
    allocate ( x(1:n) )
    write ( *, '(a)' ) ''
    write ( *, '(a)' ) '     N      C      A         B'
    write ( *, '(a)' ) ''
    write ( *, '(2x,i4,2x,i4,2x,f8.4,2x,f8.4)' ) n, c, a, b

    call line_grid ( n, a, b, c, x )
    call r8vec_print ( n, x, '  Grid points:' )

    deallocate ( x )

  end do

  return
end
subroutine test03 ( )

!*****************************************************************************80
!
!! TEST03 tries all the centering options.
!
!  Licensing:
!
!    This code is distributed under the MIT license. 
!
!  Modified:
!
!    31 August 2014
!
!  Author:
!
!    John Burkardt
!
  implicit none

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

  integer, parameter :: n = 11

  real ( kind = rk ), parameter :: a = 0.0D+00
  real ( kind = rk ), parameter :: b = 100.0D+00
  integer c
  real ( kind = rk ) x(n)

  write ( *, '(a)' ) ''
  write ( *, '(a)' ) 'TEST03'
  write ( *, '(a)' ) '  Try the different centering options.'
  write ( *, '(a,i4)' ) '  Number of grid points N = ', n

  do c = 1, 5

    write ( *, '(a)' ) ''
    write ( *, '(a)' ) '     N      C      A         B'
    write ( *, '(a)' ) ''
    write ( *, '(2x,i4,2x,i4,2x,f8.4,2x,f8.4)' ) n, c, a, b

    call line_grid ( n, a, b, c, x )
    call r8vec_print ( n, x, '  Grid points:' )

  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
!
!  Parameters:
!
!    None
!
  implicit none

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

  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