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/* promote.c -- test intergral promotion
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This file is part of the LZO real-time data compression library.
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Copyright (C) 1996-2014 Markus Franz Xaver Johannes Oberhumer
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All Rights Reserved.
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The LZO library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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The LZO library 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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You should have received a copy of the GNU General Public License
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along with the LZO library; see the file COPYING.
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If not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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Markus F.X.J. Oberhumer
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<markus@oberhumer.com>
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http://www.oberhumer.com/opensource/lzo/
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*/
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#include <stdio.h>
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#if defined(_MSC_VER) && (_MSC_VER+0 >= 1000)
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/* disable "unreachable code" warnings */
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# pragma warning(disable: 4702)
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#endif
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int main(int argc, char *argv[])
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{
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unsigned char c;
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int s;
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if (argc < 0 && argv == NULL) /* avoid warning about unused args */
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return 0;
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c = (unsigned char) (1 << (8 * sizeof(char) - 1));
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s = 8 * (int) (sizeof(int) - sizeof(char));
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printf("Integral promotion: ");
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{
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const int u = (c << s) > 0;
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if (u)
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{
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printf("Classic C (unsigned-preserving)\n");
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printf("%d %d %uU\n", c, s, (unsigned)c << s);
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return 1;
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}
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else
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{
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printf("ANSI C (value-preserving)\n");
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printf("%d %d %d\n", c, s, c << s);
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return 0;
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}
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}
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}
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/* vim:set ts=4 sw=4 et: */
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