program main

!*****************************************************************************80
!
!! ARRAYS should be analyzed by GDB.
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    19 February 2017
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    None
!
  implicit none

  call timestamp ( )
  write ( *, '(a)' ) ''
  write ( *, '(a)' ) 'ARRAYS:'
  write ( *, '(a)' ) '  FORTRAN90 version'
  write ( *, '(a)' ) '  A program for analysis by GDB.'

  call array_test ( )
!
!  Terminate.
!
  write ( *, '(a)' ) ''
  write ( *, '(a)' ) 'ARRAYS:'
  write ( *, '(a)' ) '  Normal end of execution.'
  write ( *, '(a)' ) ''
  call timestamp ( )

  stop
end
subroutine array_test ( )

!*****************************************************************************80
!
!! ARRAY_TEST sets up some arrays, and calls ARRAY_PRINT and ARRAY_CHANGE.
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    18 February 2017
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer a(3,2)
  integer, allocatable :: b(:,:)
  integer c(1,1)
  integer i
  integer j
  integer m
  integer n

  m = 3
  n = 2

  do i = 1, m
    do j = 1, n
      a(i,j) = 10 * i + j
    end do
  end do

  allocate ( b(m,n) )
  do i = 1, m
    do j = 1, n
      b(i,j) = 100 * i + j
    end do
  end do

  c(1,1) = 1000 * 1 + 1

  call array_print ( a, b, c, m, n )

  call array_change ( a, b, c, m, n )

  deallocate ( b )

  return
end
subroutine array_print ( a, b, c, m, n )

!*****************************************************************************80
!
!! ARRAY_PRINT creates the heap array D, then prints A, B, C and D.
!
!  Discussion:
!
!    C is an array of size 1, but this function "thinks" it has size 10.
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    18 February 2017
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, integer A(M,N), B(M,N), C(1,1), M, N.
!
  implicit none

  integer m
  integer n

  integer a(m,n)
  integer b(m,n)
  integer c(m,n)
  integer d(m,n)
  integer i
  integer j

  do i = 1, m
    do j = 1, n
      d(i,j) = 10000 * i + j
    end do
  end do

  write ( *, '(a)' ) ''
  write ( *, '(a)' ) '     I     J    A     B     C     D'
  write ( *, '(a)' ) ''
  do i = 1, m
    do j = 1, n
      write ( *, '(6i6)' ) i, j, a(i,j), b(i,j), c(i,j), d(i,j)
    end do
  end do

  return
end
subroutine array_change ( a, b, c, m, n )

!*****************************************************************************80
!
!! ARRAY_CHANGE changes arrays A, B, C.
!
!  Discussion:
!
!    C is an array of size 1, but this function "thinks" it has size 10.
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    18 February 2017
!
!  Author:
!
!    John Burkardt
!
!  Parameters:
!
!    Input, integer A(10), B(10), C.
!
  implicit none

  integer m
  integer n

  integer a(m,n)
  integer b(m,n)
  integer c(m,n)
  integer i
  integer j

  do i = 1, m
    do j = 1, n
      a(i,j) = a(i,j) + 1
      b(i,j) = b(i,j) + 1
      c(i,j) = c(i,j) + 1
    end do
  end do

  write ( *, '(a)' ) ''
  write ( *, '(a)' ) '     I     J    A     B     C '
  write ( *, '(a)' ) ''
  do i = 1, m
    do j = 1, n
      write ( *, '(5i6)' ) i, j, a(i,j), b(i,j), c(i,j)
    end do
  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

  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 ( *, '(i2.2,1x,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