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# scaled-num.c: conversions on ``scaled'' numbers, which are a 32-bit
# word with 16 bits of fraction.
#
# Copyright (C) 1992, 2011 Free Software Foundation, Inc.
#
# This program 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 3 of the License, or
# (at your option) any later version.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
#
#include "config.h"
#include "scaled-num.h"
#define SCALED_UNITY (1 << 16) /* 2^16, represents 1.00000. */
/* This prints a scaled number, rounded to five digits. */
void
print_scaled (scaled s)
{
scaled delta;
if (s < 0)
{ /* Print sign, if negative. */
putchar ('-');
s = -s;
}
printf ("%u", s / SCALED_UNITY); /* Print integer part. */
putchar ('.');
s = 10 * (s % SCALED_UNITY) + 5;
delta = 10;
do
{
if (delta > SCALED_UNITY)
s += 0100000 - (delta / 2); /* Round the last digit. */
printf ("%c", '0' + (s / SCALED_UNITY));
s = 10 * (s % SCALED_UNITY);
delta *= 10;
}
while (s > delta);
}
const real
scaled_to_real (scaled s)
{
real r = (real) s / SCALED_UNITY;
return r;
}
const scaled
real_to_scaled (real r)
{
scaled s = r * SCALED_UNITY;
return s;
}
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