55 lines
2.5 KiB
C
55 lines
2.5 KiB
C
/** @file fixed.h
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* @brief A fixed point numbers implementation.
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* @author Wojciech 'vifon' Siewierski
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*/
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/***********************************************************************************/
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/* Copyright (C) 2015 Wojciech Siewierski <wojciech dot siewierski at onet dot pl> */
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/* */
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/* Author: Wojciech Siewierski <wojciech dot siewierski at onet dot pl> */
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/* */
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/* This program is free software; you can redistribute it and/or */
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/* modify it under the terms of the GNU General Public License */
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/* as published by the Free Software Foundation; either version 3 */
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/* of the License, or (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, see <http://www.gnu.org/licenses/>. */
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/***********************************************************************************/
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#ifndef _h_FIXED_
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#define _h_FIXED_
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/* Do not include pebble.h when compiling the unittests. */
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#ifndef __cplusplus
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# include <pebble.h> /* for bool */
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#endif
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#include <limits.h>
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#include <stdlib.h>
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/** The underlying fixed point representation. */
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typedef int fixed;
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/** The scaling factor of the fixed point numbers. */
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#define FIXED_SCALE 100
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/** Maximum representable value. */
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static const fixed FIXED_MAX = INT_MAX;
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fixed fixed_add(fixed lhs, fixed rhs, bool* overflow);
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fixed fixed_subt(fixed lhs, fixed rhs, bool* overflow);
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fixed fixed_mult(fixed lhs, fixed rhs, bool* overflow);
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fixed fixed_div(fixed lhs, fixed rhs);
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char* fixed_repr(fixed fixed, char* buffer, size_t size);
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fixed str_to_fixed(const char* str, bool* overflow);
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int fixed_to_int(fixed n);
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fixed int_to_fixed(int n);
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fixed fixed_pow(fixed base, int exponent, bool* overflow);
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#endif |