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https://github.com/RGBCube/serenity
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8f552c9979
Calculator now uses the KeypadValue class instead of double in its internal calculations. By not constantly converting to double back-and-forth, we do not use precision simply by, for example, negating a number. This fixes #7484.
124 lines
2.8 KiB
C++
124 lines
2.8 KiB
C++
/*
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* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "Calculator.h"
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#include "KeypadValue.h"
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#include <AK/Assertions.h>
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#include <AK/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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KeypadValue Calculator::begin_operation(Operation operation, KeypadValue argument)
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{
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KeypadValue res = 0;
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switch (operation) {
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case Operation::None:
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VERIFY_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) {
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m_has_error = true;
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return argument;
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}
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res = KeypadValue { AK::sqrt((double)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) {
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m_has_error = true;
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return argument;
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}
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res = KeypadValue { 1.0 / (double)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 * KeypadValue { 1, 2 }; // also known as `KeypadValue{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;
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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 = m_mem + argument; //avoids the need for operator+=()
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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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KeypadValue Calculator::finish_operation(KeypadValue argument)
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{
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KeypadValue res = 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) {
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m_has_error = true;
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return argument;
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}
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res = KeypadValue { (double)m_saved_argument / (double)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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VERIFY_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;
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clear_error();
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}
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