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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.
54 lines
1.1 KiB
C++
54 lines
1.1 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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#pragma once
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#include "KeypadValue.h"
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// This type implements the regular calculator
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// behavior, such as performing arithmetic
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// operations and providing a memory cell.
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// It does not deal with number input; you
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// have to pass in already parsed double
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// values.
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class Calculator final {
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public:
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Calculator();
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~Calculator();
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enum class Operation {
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None,
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Add,
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Subtract,
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Multiply,
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Divide,
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Sqrt,
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Inverse,
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Percent,
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ToggleSign,
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MemClear,
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MemRecall,
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MemSave,
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MemAdd
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};
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KeypadValue begin_operation(Operation, KeypadValue);
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KeypadValue finish_operation(KeypadValue);
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bool has_error() const { return m_has_error; }
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void clear_operation();
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void clear_error() { m_has_error = false; }
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private:
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Operation m_operation_in_progress { Operation::None };
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KeypadValue m_saved_argument { (i64)0 };
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KeypadValue m_mem { (i64)0 };
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bool m_has_error { false };
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};
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