32 lines
1.1 KiB
C
Executable File
32 lines
1.1 KiB
C
Executable File
/* powf.c: Computes x**y where x and y are 32-bit floats.
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WARNING: less that 6 digits accuracy.
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Copyright (C) 2001, 2002 Jesus Calvino-Fraga, jesusc@ieee.org
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* Version 1.0 - Initial release */
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#include "math.h"
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#include "errno.h"
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float powf(const float x, const float y)
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{
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if(y == 0.0) return 1.0;
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if(y==1.0) return x;
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if(x <= 0.0) return 0.0;
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return expf(logf(x) * y);
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}
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