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144 lines
3.8 KiB
C++
144 lines
3.8 KiB
C++
/*
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* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "Calculator.h"
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#include <AK/Assertions.h>
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#include <math.h>
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Calculator::Calculator()
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{
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}
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Calculator::~Calculator()
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{
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}
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double Calculator::begin_operation(Operation operation, double argument)
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{
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double res = 0.0;
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switch (operation) {
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case Operation::None:
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ASSERT_NOT_REACHED();
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case Operation::Add:
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case Operation::Subtract:
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case Operation::Multiply:
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case Operation::Divide:
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m_saved_argument = argument;
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m_operation_in_progress = operation;
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return argument;
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case Operation::Sqrt:
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if (argument < 0.0) {
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m_has_error = true;
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return argument;
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}
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res = sqrt(argument);
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clear_operation();
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break;
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case Operation::Inverse:
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if (argument == 0.0) {
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m_has_error = true;
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return argument;
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}
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res = 1 / argument;
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clear_operation();
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break;
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case Operation::Percent:
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res = argument * 0.01;
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break;
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case Operation::ToggleSign:
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res = -argument;
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break;
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case Operation::MemClear:
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m_mem = 0.0;
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res = argument;
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break;
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case Operation::MemRecall:
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res = m_mem;
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break;
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case Operation::MemSave:
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m_mem = argument;
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res = argument;
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break;
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case Operation::MemAdd:
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m_mem += argument;
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res = m_mem;
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break;
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}
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return res;
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}
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double Calculator::finish_operation(double argument)
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{
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double res = 0.0;
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switch (m_operation_in_progress) {
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case Operation::None:
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return argument;
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case Operation::Add:
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res = m_saved_argument + argument;
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break;
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case Operation::Subtract:
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res = m_saved_argument - argument;
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break;
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case Operation::Multiply:
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res = m_saved_argument * argument;
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break;
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case Operation::Divide:
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if (argument == 0.0) {
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m_has_error = true;
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return argument;
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}
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res = m_saved_argument / argument;
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break;
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case Operation::Sqrt:
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case Operation::Inverse:
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case Operation::Percent:
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case Operation::ToggleSign:
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case Operation::MemClear:
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case Operation::MemRecall:
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case Operation::MemSave:
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case Operation::MemAdd:
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ASSERT_NOT_REACHED();
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}
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clear_operation();
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return res;
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}
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void Calculator::clear_operation()
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{
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m_operation_in_progress = Operation::None;
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m_saved_argument = 0.0;
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clear_error();
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}
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