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?RCS: $Id$
?RCS:
?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi
?RCS:
?RCS: You may redistribute only under the terms of the Artistic Licence,
?RCS: as specified in the README file that comes with the distribution.
?RCS: You may reuse parts of this distribution only within the terms of
?RCS: that same Artistic Licence; a copy of which may be found at the root
?RCS: of the source tree for dist 4.0.
?RCS:
?RCS: $Log: randbits.U,v $
?RCS: Revision 3.0.1.1 1997/02/28 16:19:29 ram
?RCS: patch61: added <unistd.h> and <stdlib.h> to the C program test
?RCS:
?RCS: Revision 3.0 1993/08/18 12:09:38 ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
?X:
?X: This unit has been somewhat made obsolete with creation of the
?X: randfunc function (which finds out how to generate random
?X: numbers between 0 and 1.
?X:
?MAKE:randbits: cat rm Myread cc i_unistd i_stdlib
?MAKE: -pick add $@ %<
?S:randbits:
?S: This variable contains the eventual value of the RANDBITS symbol,
?S: which indicates to the C program how many bits of random number
?S: the rand() function produces.
?S:.
?C:RANDBITS:
?C: This symbol contains the number of bits of random number the rand()
?C: function produces. Usual values are 15, 16, and 31.
?C:.
?H:#define RANDBITS $randbits /**/
?H:.
: check for size of random number generator
echo " "
case "$randbits" in
'')
echo "Checking to see how many bits your rand function produces..." >&4
$cat >try.c <<EOCP
#$i_unistd I_UNISTD
#$i_stdlib I_STDLIB
#include <stdio.h>
#ifdef I_UNISTD
# include <unistd.h>
#endif
#ifdef I_STDLIB
# include <stdlib.h>
#endif
EOCP
$cat >>try.c <<'EOCP'
int main()
{
register int i;
register unsigned long tmp;
register unsigned long max = 0L;
for (i = 1000; i; i--) {
tmp = (unsigned long)rand();
if (tmp > max) max = tmp;
}
for (i = 0; max; i++)
max /= 2;
printf("%d\n",i);
}
EOCP
if $cc -o try try.c >/dev/null 2>&1 ; then
dflt=`try`
else
dflt='?'
echo "(I can't seem to compile the test program...)"
fi
;;
*)
dflt="$randbits"
;;
esac
rp='How many bits does your rand() function produce?'
. ./myread
randbits="$ans"
$rm -f try.c try
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