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