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https://github.com/RGBCube/serenity
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7532ef78ad
Small numbers (smaller than 1e-19) can't be displayed in the calculator. They provoke a division by zero in Keypad::set_value(), as 10^20 overflows.
48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
/*
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* Copyright (c) 2021, 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 <AK/Math.h>
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#include <AK/String.h>
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#include <AK/Types.h>
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class KeypadValue {
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friend class Keypad;
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friend class Calculator;
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public:
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KeypadValue(i64, u8);
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KeypadValue(i64);
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explicit KeypadValue(StringView);
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KeypadValue operator+(KeypadValue const&);
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KeypadValue operator-(KeypadValue const&);
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KeypadValue operator*(KeypadValue const&);
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KeypadValue operator-(void) const;
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bool operator<(KeypadValue const&);
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bool operator==(KeypadValue const&);
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KeypadValue sqrt() const;
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KeypadValue invert() const;
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KeypadValue operator/(KeypadValue const&);
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private:
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explicit KeypadValue(double);
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explicit operator double() const;
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template<typename T, typename F>
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T operator_helper(KeypadValue const& lhs, KeypadValue const& rhs, F callback);
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// This class represents a pair of a value together with the amount of decimal places that value is offset by.
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// For example, if we were to represent the value -123.55 in this format, m_value would be -12355 and
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// m_decimal_places would be 2, because when you shift -12355 2 digits to the right, you get -123.55.
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// This way, most operations don't have to be performed on doubles, but can be performed without loss of
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// precision on this class.
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i64 m_value { 0 };
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u8 m_decimal_places { 0 };
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};
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