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Diffstat (limited to 'mcon/U/randbits.U')
| -rw-r--r-- | mcon/U/randbits.U | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/mcon/U/randbits.U b/mcon/U/randbits.U new file mode 100644 index 0000000..fb7be43 --- /dev/null +++ b/mcon/U/randbits.U @@ -0,0 +1,83 @@ +?RCS: $Id: randbits.U,v 3.0.1.1 1997/02/28 16:19:29 ram Exp $ +?RCS: +?RCS: Copyright (c) 1991-1993, 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 3.0. +?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' +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 $cc try.c -o try >/dev/null 2>&1 ; then + dflt=`try` + else + dflt='?' + echo "(I can't seem to compile the test program...)" + fi + ;; +*) + dflt="$randbits" + ;; +esac +rp='How many bits does your rand() function produce?' +. ./myread +randbits="$ans" +$rm -f try.c try + |