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44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
/*
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* sqrt.c - Newton sqrt
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*
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* Copyright 2016 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#define _XOPEN_SOURCE 1111
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#include <stdio.h>
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#include <math.h>
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#include <stdlib.h>
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float SQRT(float x, int iter){
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float Result;
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int i = 0;
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Result = x;
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for (i; i < iter; i++)
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Result = (Result + x / Result) / 2;
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return Result;
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}
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int main(int argc, char **argv){
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if(argc != 2) return 1;
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float x = strtof(argv[1], NULL);
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if(x < 0) return 2;
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printf("sqr(%f) = %f, by 6iter: %f, by 8iter: %f, by 16iter: %f\n", x, sqrtf(x),
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SQRT(x, 6), SQRT(x, 8), SQRT(x, 16));
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return 0;
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}
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