71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2006, Dave Pare, Jeff Bailey, Thomas Ruschak,
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* Ken Stevens, Steve McClure
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* ---
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*
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* See files README, COPYING and CREDITS in the root of the source
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* tree for related information and legal notices. It is expected
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* that future projects/authors will amend these files as needed.
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*
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* ---
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*
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* chance.c: return 1 if "roll" is under the chance.
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*
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* Known contributors to this file:
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*
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*/
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#include <config.h>
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#include "gen.h"
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int
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chance(double d)
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{
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double roll;
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roll = random() & 0x7fff;
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if (d > roll / 32768.0)
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return 1;
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return 0;
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}
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int
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roll(int n)
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{
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return 1 + random() % n;
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}
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/*
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* round value to nearest int (on the average). E.g. rounds up
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* with a chance proportional to the size of the fractional part.
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*/
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int
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roundavg(double val)
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{
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int flr;
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flr = (int)val;
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if (val < 0)
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flr -= chance(flr - val);
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else
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flr += chance(val - flr);
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return flr;
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}
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