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geomean.c
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geomean.c
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/*
* 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 <https://www.gnu.org/licenses/>.
*
* Copyright (C) 2018 Stefan Teleman.
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
static inline double geomean(double x, unsigned n)
{
return exp(log(x) / n);
}
int main(int argc, char* argv[])
{
if (argc < 3) {
(void) fprintf(stderr, "Usage: geomean <sequence-of-values>\n");
return 1;
}
double s = 1.0;
unsigned n = 0;
while (--argc >= 1) {
s *= strtod(argv[argc], NULL);
++n;
}
(void) fprintf(stdout, "%lf\n", geomean(s, n));
return 0;
}