Last change
on this file since 2929 was
1907,
checked in by lguez, 11 years ago
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Added a copyright property to every file of the distribution, except
for the fcm files (which have their own copyright). Use svn propget on
a file to see the copyright. For instance:
$ svn propget copyright libf/phylmd/physiq.F90
Name of program: LMDZ
Creation date: 1984
Version: LMDZ5
License: CeCILL version 2
Holder: Laboratoire de m\'et\'eorologie dynamique, CNRS, UMR 8539
See the license file in the root directory
Also added the files defining the CeCILL version 2 license, in French
and English, at the top of the LMDZ tree.
|
-
Property copyright set to
Name of program: LMDZ Creation date: 1984 Version: LMDZ5 License: CeCILL version 2 Holder: Laboratoire de m\'et\'eorologie dynamique, CNRS, UMR 8539 See the license file in the root directory
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File size:
1.2 KB
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1 | module get_divisors_m |
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2 | |
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3 | implicit none |
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4 | |
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5 | contains |
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6 | |
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7 | subroutine get_divisors(n, div) |
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8 | |
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9 | ! Find all the divisors of a given integer. |
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10 | |
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11 | integer, intent(in):: n |
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12 | integer, pointer:: div(:) |
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13 | |
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14 | ! Variables local to the procedure: |
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15 | |
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16 | integer i, i_max |
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17 | integer n_div ! number of divisors of "n" |
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18 | integer work(n) ! temporary array to hold divisors |
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19 | |
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20 | !------------------------ |
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21 | |
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22 | if (n <= 0) then |
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23 | print *, "get_divisors: n = ", n |
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24 | stop 1 |
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25 | end if |
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26 | |
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27 | if (n == 1) then |
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28 | work(1) = 1 |
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29 | n_div = 1 |
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30 | else |
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31 | ! n >= 2, there are at least two divisors: 1 and "n" |
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32 | work(1) = 1 |
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33 | work(2) = n |
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34 | n_div = 2 |
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35 | |
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36 | i_max = int(sqrt(real(n))) |
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37 | |
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38 | do i = 2, i_max - 1 |
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39 | if (mod(n, i) == 0) then |
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40 | work(n_div+1) = i |
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41 | work(n_div+2) = n / i |
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42 | n_div = n_div + 2 |
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43 | end if |
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44 | end do |
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45 | |
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46 | if (i_max >= 2 .and. mod(n, i_max) == 0) then |
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47 | work(n_div+1) = i_max |
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48 | n_div = n_div + 1 |
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49 | if (i_max**2 /= n) then |
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50 | work(n_div+1) = n / i_max |
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51 | n_div = n_div + 1 |
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52 | end if |
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53 | end if |
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54 | end if |
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55 | |
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56 | allocate(div(n_div)) |
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57 | div = work(:n_div) |
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58 | |
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59 | end subroutine get_divisors |
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60 | |
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61 | end module get_divisors_m |
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