program main

!*****************************************************************************80
!
!! toms515_test() tests toms515().
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    28 March 2016
!
!  Author:
!
!    John Burkardt
!
  implicit none

  call timestamp ( )
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'toms515_test():'
  write ( *, '(a)' ) '  FORTRAN90 version'
  write ( *, '(a)' ) '  Test toms515().'

  call test01 ( )
  call test02 ( )
  call test03 ( )
  call test04 ( )
  call test05 ( )
!
!  Terminate.
!
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'toms515_test():'
  write ( *, '(a)' ) '  Normal end of execution.'
  write ( *, '(a)' ) ' '
  call timestamp ( )

  stop 0
end
subroutine test01 ( )

!*****************************************************************************80
!
!! TEST01 tests COMB by generating all 3-subsets of a 5 set.
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    27 March 2016
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer n
  parameter ( n = 5 )
  integer k
  parameter ( k = 3 )

  integer binom
  integer c(k)
  logical i4_choose_check
  integer l
  integer lmax

  lmax = binom ( n, k )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST01'
  write ( *, '(a)' ) '  Generate all K-subsets of an N set.'
  write ( *, '(a,i6)' ) '  K = ', k
  write ( *, '(a,i6)' ) '  N = ', n
  write ( *, '(a,i10)' ) '  LMAX = ', lmax

  if ( .not. i4_choose_check ( n, k ) ) then
    write ( *, '(a)' ) ''
    write ( *, '(a)' ) 'TEST01 - Warning!'
    write ( *, '(a)' ) '  The binomial coefficient cannot be'
    write ( *, '(a)' ) '  computed in integer arithmetic for'
    write ( *, '(a)' ) '  this choice of parameters.'
    return
  end if

  write ( *, '(a)' ) ' '

  do l = 1, lmax
    call comb ( n, k, l, c )
    write ( *, * ) l, c(1:k)
  end do

  return
end
subroutine test02 ( )

!*****************************************************************************80
!
!! TEST02 tests COMB by generating 10 random 3-subsets of a 10 set.
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    27 March 2016
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer n
  parameter ( n = 5 )
  integer k
  parameter ( k = 3 )

  integer binom
  integer c(k)
  integer i
  logical i4_choose_check
  integer i4_uniform_ab
  integer l
  integer lmax

  lmax = binom ( n, k )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST02'
  write ( *, '(a)' ) '  Generate 10 random K-subsets of an N set.'
  write ( *, '(a,i6)' ) '  K = ', k
  write ( *, '(a,i6)' ) '  N = ', n
  write ( *, '(a,i10)' ) '  LMAX = ', lmax

  if ( .not. i4_choose_check ( n, k ) ) then
    write ( *, '(a)' ) ''
    write ( *, '(a)' ) 'TEST02 - Warning!'
    write ( *, '(a)' ) '  The binomial coefficient cannot be'
    write ( *, '(a)' ) '  computed in integer arithmetic for'
    write ( *, '(a)' ) '  this choice of parameters.'
    return
  end if

  write ( *, '(a)' ) ' '

  do i = 1, 10
    l = i4_uniform_ab ( 1, lmax )
    call comb ( n, k, l, c )
    write ( *, * ) l, c(1:k)
  end do

  return
end
subroutine test03 ( )

!*****************************************************************************80
!
!! TEST03 tests COMB by generating 10 random 3-subsets of a 25 set.
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    27 March 2016
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer n
  parameter ( n = 25 )
  integer k
  parameter ( k = 3 )

  integer binom
  integer c(k)
  integer i
  logical i4_choose_check
  integer i4_uniform_ab
  integer l
  integer lmax

  lmax = binom ( n, k )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST03'
  write ( *, '(a)' ) '  Generate 10 random K-subsets of an N set.'
  write ( *, '(a,i6)' ) '  K = ', k
  write ( *, '(a,i6)' ) '  N = ', n
  write ( *, '(a,i10)' ) '  LMAX = ', lmax

  if ( .not. i4_choose_check ( n, k ) ) then
    write ( *, '(a)' ) ''
    write ( *, '(a)' ) 'TEST03 - Warning!'
    write ( *, '(a)' ) '  The binomial coefficient cannot be'
    write ( *, '(a)' ) '  computed in integer arithmetic for'
    write ( *, '(a)' ) '  this choice of parameters.'
    return
  end if

  write ( *, '(a)' ) ' '

  do i = 1, 10
    l = i4_uniform_ab ( 1, lmax )
    call comb ( n, k, l, c )
    write ( *, * ) l, c(1:k)
  end do

  return
end
subroutine test04 ( )

!*****************************************************************************80
!
!! TEST04 tests COMB by generating 10 random 3-subsets of a 100 set.
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    27 March 2016
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer n
  parameter ( n = 100 )
  integer k
  parameter ( k = 3 )

  integer binom
  integer c(k)
  integer i
  logical i4_choose_check
  integer i4_uniform_ab
  integer l
  integer lmax

  lmax = binom ( n, k )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST04'
  write ( *, '(a)' ) '  Generate 10 random K-subsets of an N set.'
  write ( *, '(a,i6)' ) '  K = ', k
  write ( *, '(a,i6)' ) '  N = ', n
  write ( *, '(a,i10)' ) '  LMAX = ', lmax

  if ( .not. i4_choose_check ( n, k ) ) then
    write ( *, '(a)' ) ''
    write ( *, '(a)' ) 'TEST04 - Warning!'
    write ( *, '(a)' ) '  The binomial coefficient cannot be'
    write ( *, '(a)' ) '  computed in integer arithmetic for'
    write ( *, '(a)' ) '  this choice of parameters.'
    return
  end if

  write ( *, '(a)' ) ' '

  do i = 1, 10
    l = i4_uniform_ab ( 1, lmax )
    call comb ( n, k, l, c )
    write ( *, * ) l, c(1:k)
  end do

  return
end
subroutine test05 ( )

!*****************************************************************************80
!
!! TEST05 tests COMB by generating 10 random 10-subsets of a 100 set.
!
!  Licensing:
!
!    This code is distributed under the MIT license.
!
!  Modified:
!
!    27 March 2016
!
!  Author:
!
!    John Burkardt
!
  implicit none

  integer n
  parameter ( n = 100 )
  integer k
  parameter ( k = 10 )

  integer binom
  integer c(k)
  integer i
  logical i4_choose_check
  integer i4_uniform_ab
  integer l
  integer lmax

  lmax = binom ( n, k )

  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) 'TEST05'
  write ( *, '(a)' ) '  Generate 10 random K-subsets of an N set.'
  write ( *, '(a,i6)' ) '  K = ', k
  write ( *, '(a,i6)' ) '  N = ', n
  write ( *, '(a,i10)' ) '  LMAX = ', lmax
  write ( *, '(a)' ) ' '
  write ( *, '(a)' ) '  Note that this function is already'
  write ( *, '(a)' ) '  failing because LMAX is negative.'
  write ( *, '(a)' ) '  The combinatorial coefficient C(100,10)'
  write ( *, '(a)' ) '  is too large to store in an integer.'
  write ( *, '(a)' ) ''
  write ( *, '(a)' ) '  Although the program continues to give'
  write ( *, '(a)' ) '  results, they cannot be relied on!'

  if ( .not. i4_choose_check ( n, k ) ) then
    write ( *, '(a)' ) ''
    write ( *, '(a)' ) 'TEST05 - Warning!'
    write ( *, '(a)' ) '  The binomial coefficient cannot be'
    write ( *, '(a)' ) '  computed in integer arithmetic for'
    write ( *, '(a)' ) '  this choice of parameters.'
    return
  end if

  write ( *, '(a)' ) ''

  do i = 1, 10
    l = i4_uniform_ab ( 1, lmax )
    call comb ( n, k, l, c )
    write ( *, * ) l, c(1:k)
  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