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/* promote.c -- test intergral promotion
This file is part of the LZO real-time data compression library.
Copyright (C) 1996-2017 Markus Franz Xaver Johannes Oberhumer
All Rights Reserved.
The LZO library is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
The LZO library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the LZO library; see the file COPYING.
If not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
Markus F.X.J. Oberhumer
<markus@oberhumer.com>
http://www.oberhumer.com/opensource/lzo/
*/
#include <stdio.h>
#if defined(_MSC_VER) && (_MSC_VER+0 >= 1000)
/* disable "unreachable code" warnings */
# pragma warning(disable: 4702)
#endif
int main(int argc, char *argv[])
{
unsigned char c;
int s;
if (argc < 0 && argv == NULL) /* avoid warning about unused args */
return 0;
c = (unsigned char) (1 << (8 * sizeof(char) - 1));
s = 8 * (int) (sizeof(int) - sizeof(char));
printf("Integral promotion: ");
{
const int u = (c << s) > 0;
if (u)
{
printf("Classic C (unsigned-preserving)\n");
printf("%d %d %uU\n", c, s, (unsigned)c << s);
return 1;
}
else
{
printf("ANSI C (value-preserving)\n");
printf("%d %d %d\n", c, s, c << s);
return 0;
}
}
}
/* vim:set ts=4 sw=4 et: */
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