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53eb35caba
The purpose of this patch is to support addition, subtraction, multiplication and division without using conversion to double. To this end, we use the BigFraction class of LibCrypto. With this solution, we can store values without any losses and forward rounding as the last step before displaying.
55 lines
1.2 KiB
C++
55 lines
1.2 KiB
C++
/*
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* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
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* Copyright (c) 2022, the SerenityOS developers.
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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 <LibCrypto/BigFraction/BigFraction.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() = default;
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~Calculator() = default;
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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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Crypto::BigFraction begin_operation(Operation, Crypto::BigFraction);
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Crypto::BigFraction finish_operation(Crypto::BigFraction);
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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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Crypto::BigFraction m_saved_argument {};
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Crypto::BigFraction m_mem {};
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bool m_has_error { false };
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};
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