基于C++实现一个Windows多功能计算器

// 初始化计算器管理器
CalculatorManager manager(displayCallback, resourceProvider);

// 设置标准模式
manager.SetStandardMode();

// 发送计算命令
manager.SendCommand(Command::ADD);

// 创建单位转换器
UnitConverter converter(dataLoader);

// 执行温度单位转换
converter.Convert(100, "Celsius", "Fahrenheit");

// 使用Bing数据进行货币转换
CurrencyConverter currencyConverter(currencyDataLoader);
currencyConverter.Convert(100, "USD", "EUR");

// CalculatorHistory.cpp - 历史记录管理实现
unsigned int CalculatorHistory::AddToHistory(
    _In_ shared_ptr<vector<pair<wstring, int>>> const& tokens,
    _In_ shared_ptr<vector<shared_ptr<IExpressionCommand>>> const& commands,
    wstring_view result)
{
    shared_ptr<HISTORYITEM> spHistoryItem = make_shared<HISTORYITEM>();
    
    spHistoryItem->historyItemVector.spTokens = tokens;
    spHistoryItem->historyItemVector.spCommands = commands;
    spHistoryItem->historyItemVector.expression = GetGeneratedExpression(*tokens);
    spHistoryItem->historyItemVector.result = wstring(result);
    
    return AddItem(spHistoryItem);
}

// Rational.cpp - 有理数运算实现
Rational Rational::operator-() const
{
    return Rational{ 
        Number{ -1 * m_p.Sign(), m_p.Exp(), m_p.Mantissa() }, 
        m_q 
    };
}

Rational& Rational::operator+=(Rational const& rhs)
{
    PRAT lhsRat = this->ToPRAT();
    PRAT rhsRat = rhs.ToPRAT();
    
    try {
        addrat(&lhsRat, rhsRat, RATIONAL_BASE, RATIONAL_PRECISION);
        destroyrat(rhsRat);
    }
    catch (uint32_t error) {
        destroyrat(lhsRat);
        destroyrat(rhsRat);
        throw(error);
    }
    
    *this = Rational{ lhsRat };
    destroyrat(lhsRat);
    
    return *this;
}

// ExpressionCommand.cpp - 表达式命令处理
CalculationManager::CommandType CUnaryCommand::GetCommandType() const
{
    return CalculationManager::CommandType::UnaryCommand;
}

void CUnaryCommand::Accept(_In_ ISerializeCommandVisitor& commandVisitor)
{
    commandVisitor.Visit(*this);
}

// NumberFormattingUtils.cpp - 数字格式化工具
void TrimTrailingZeros(_Inout_ wstring& number)
{
    if (number.find(L'.') == wstring::npos) {
        return;
    }
    
    if (auto i = number.find_last_not_of(L'0'); i != wstring::npos) {
        number.erase(number.cbegin() + i + 1, number.cend());
    }
    
    if (number.back() == L'.') {
        number.pop_back();
    }
}

// CalcEngine.cpp - 计算引擎核心功能
void CCalcEngine::ProcessCommand(OpCode wID)
{
    if (IsGuiSettingOpCode(wID)) {
        // 处理GUI设置操作码
        HandleGuiSettingCommand(wID);
    } else if (IsDigitOpCode(wID)) {
        // 处理数字输入
        HandleDigitCommand(wID);
    } else if (IsBinOpCode(wID)) {
        // 处理二元操作符
        HandleBinaryOperatorCommand(wID);
    } else if (IsUnaryOpCode(wID)) {
        // 处理一元操作符
        HandleUnaryOperatorCommand(wID);
    }
}