1!
2!     CalculiX - A 3-dimensional finite element program
3!              Copyright (C) 1998-2021 Guido Dhondt
4!
5!     This program is free software; you can redistribute it and/or
6!     modify it under the terms of the GNU General Public License as
7!     published by the Free Software Foundation(version 2);
8!
9!
10!     This program is distributed in the hope that it will be useful,
11!     but WITHOUT ANY WARRANTY; without even the implied warranty of
12!     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13!     GNU General Public License for more details.
14!
15!     You should have received a copy of the GNU General Public License
16!     along with this program; if not, write to the Free Software
17!     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18!
19!     S.W. Sloan, Adv.Eng.Software,1987,9(1),34-55.
20!     Permission for use with the GPL license granted by Prof. Scott
21!     Sloan on 17. Nov. 2013
22!
23      function pop(topstk,stack)
24!
25      implicit none
26!
27      integer pop,topstk,stack(*)
28!
29      if(topstk.gt.0) then
30         pop=stack(topstk)
31         topstk=topstk-1
32      else
33         write(6,'("0***error in function pop***")')
34         write(6,'("***stack underflow***")')
35         call exit(201)
36      end if
37      end
38
39