MQL5 リファレンス標準ライブラリトレードクラスCAccountInfoBalance LoginTradeModeTradeModeDescriptionLeverageStopoutModeStopoutModeDescriptionMarginModeMarginModeDescriptionTradeAllowedTradeExpertLimitOrdersBalanceCreditProfitEquityMarginFreeMarginMarginLevelMarginCallMarginStopOutNameServerCurrencyCompanyInfoIntegerInfoDoubleInfoStringOrderProfitCheckMarginCheckFreeMarginCheckMaxLotCheck Balance 계좌 잔고 가져오기. double Balance() const 값 반환 계좌 잔고(예금 통화). LimitOrders Credit