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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.
50 lines
1 KiB
C++
50 lines
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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#include <AK/String.h>
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// This type implements number typing and
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// displaying mechanics. It does not perform
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// any arithmetic operations or anything on
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// the values it deals with.
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class Keypad final {
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public:
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Keypad();
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~Keypad();
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void type_digit(int digit);
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void type_decimal_point();
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void type_backspace();
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KeypadValue value() const;
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void set_value(KeypadValue);
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String to_string() const;
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private:
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// Internal representation of the current decimal value.
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bool m_negative { false };
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Checked<u64> m_int_value { 0 };
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Checked<u64> m_frac_value { 0 };
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u8 m_frac_length { 0 };
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// E.g. for -35.004200,
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// m_negative = true
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// m_int_value = 35
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// m_frac_value = 4200
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// m_frac_length = 6
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enum class State {
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External,
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TypingInteger,
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TypingDecimal
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};
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State m_state { State::External };
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};
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