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    1: /* a simple pow10 implementation
    2: 
    3:   Copyright (C) 1995,1998,2000,2003,2007 Free Software Foundation, Inc.
    4: 
    5:   This file is part of Gforth.
    6: 
    7:   Gforth is free software; you can redistribute it and/or
    8:   modify it under the terms of the GNU General Public License
    9:   as published by the Free Software Foundation, either version 3
   10:   of the License, or (at your option) any later version.
   11: 
   12:   This program is distributed in the hope that it will be useful,
   13:   but WITHOUT ANY WARRANTY; without even the implied warranty of
   14:   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15:   GNU General Public License for more details.
   16: 
   17:   You should have received a copy of the GNU General Public License
   18:   along with this program; if not, see http://www.gnu.org/licenses/.
   19: */
   20: #include <math.h>
   21: 
   22: #ifndef M_LN10
   23: #define M_LN10      2.30258509299404568402
   24: #endif
   25: 
   26: #if !defined(_ANSI_MATH_H) && !defined(exp)
   27: /* this should be defined by math.h; If it is not, the miranda
   28:  *    prototype would be wrong; Since we prefer compile-time errors to
   29:  *    run-time errors, it's declared here. */
   30: extern double exp(double);
   31: 
   32: #endif /* _ANSI_MATH_H */
   33: 
   34: double pow10(double x)
   35: {
   36:   return exp(x*M_LN10);
   37: }