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Language Basics
- Syntax
- Data Types
- Operations and Expressions
- Operators
- Functions
- Variables
- Preprocessor
- Object-Oriented Programming
- Updated MQL4
Constants, Enumerations and Structures
- Chart Constants
- Objects Constants
- Indicator Constants
- Environment State
- Trade Constants
- Named Constants
- Data Structures
- Codes of Errors and Warnings
- Input/Output Constants
MQL4 programs
- Program Running
- Trade Permission
- Client Terminal Events
- Resources
- Call of Imported Functions
- Runtime Errors
- Operation of Programs in the Strategy Tester
Predefined Variables
- _Digits
- _Point
- _LastError
- _Period
- _RandomSeed
- _StopFlag
- _Symbol
- _UninitReason
- Ask
- Bars
- Bid
- Close
- Digits
- High
- Low
- Open
- Point
- Time
- Volume
Common Functions
- Alert
- CheckPointer
- Comment
- CryptEncode
- CryptDecode
- DebugBreak
- ExpertRemove
- GetPointer
- GetTickCount
- GetMicrosecondCount
- MessageBox
- PeriodSeconds
- PlaySound
- Print
- PrintFormat
- ResetLastError
- ResourceCreate
- ResourceFree
- ResourceReadImage
- ResourceSave
- SetUserError
- SendFTP
- SendMail
- SendNotification
- Sleep
- TerminalClose
- TesterStatistics
- TranslateKey
- WebRequest
- ZeroMemory
Array Functions
- ArrayBsearch
- ArrayCopy
- ArrayCompare
- ArrayFree
- ArrayGetAsSeries
- ArrayInitialize
- ArrayFill
- ArrayIsDynamic
- ArrayIsSeries
- ArrayMaximum
- ArrayMinimum
- ArrayRange
- ArrayResize
- ArraySetAsSeries
- ArraySize
- ArraySort
- ArrayCopyRates
- ArrayCopySeries
- ArrayDimension
Conversion Functions
- CharToString
- CharArrayToString
- ColorToARGB
- ColorToString
- DoubleToString
- EnumToString
- IntegerToString
- ShortToString
- ShortArrayToString
- TimeToString
- NormalizeDouble
- StringToCharArray
- StringToColor
- StringToDouble
- StringToInteger
- StringToShortArray
- StringToTime
- StringFormat
- CharToStr
- DoubleToStr
- StrToDouble
- StrToInteger
- StrToTime
- TimeToStr
Math Functions
- MathAbs
- MathArccos
- MathArcsin
- MathArctan
- MathCeil
- MathCos
- MathExp
- MathFloor
- MathLog
- MathLog10
- MathMax
- MathMin
- MathMod
- MathPow
- MathRand
- MathRound
- MathSin
- MathSqrt
- MathSrand
- MathTan
- MathIsValidNumber
String Functions
- StringAdd
- StringBufferLen
- StringCompare
- StringConcatenate
- StringFill
- StringFind
- StringGetCharacter
- StringInit
- StringLen
- StringReplace
- StringSetCharacter
- StringSplit
- StringSubstr
- StringToLower
- StringToUpper
- StringTrimLeft
- StringTrimRight
- StringGetChar
- StringSetChar
Date and Time
- TimeCurrent
- TimeLocal
- TimeGMT
- TimeDaylightSavings
- TimeGMTOffset
- TimeToStruct
- StructToTime
- Day
- DayOfWeek
- DayOfYear
- Hour
- Minute
- Month
- Seconds
- TimeDay
- TimeDayOfWeek
- TimeDayOfYear
- TimeHour
- TimeMinute
- TimeMonth
- TimeSeconds
- TimeYear
- Year
Account Information
- AccountInfoDouble
- AccountInfoInteger
- AccountInfoString
- AccountBalance
- AccountCredit
- AccountCompany
- AccountCurrency
- AccountEquity
- AccountFreeMargin
- AccountFreeMarginCheck
- AccountFreeMarginMode
- AccountLeverage
- AccountMargin
- AccountName
- AccountNumber
- AccountProfit
- AccountServer
- AccountStopoutLevel
- AccountStopoutMode
Checkup
- GetLastError
- IsStopped
- UninitializeReason
- MQLInfoInteger
- MQLInfoString
- MQLSetInteger
- TerminalInfoInteger
- TerminalInfoDouble
- TerminalInfoString
- Symbol
- Period
- Digits
- Point
- IsConnected
- IsDemo
- IsDllsAllowed
- IsExpertEnabled
- IsLibrariesAllowed
- IsOptimization
- IsTesting
- IsTradeAllowed
- IsTradeContextBusy
- IsVisualMode
- TerminalCompany
- TerminalName
- TerminalPath
Market Info
- MarketInfo
- SymbolsTotal
- SymbolName
- SymbolSelect
- SymbolInfoDouble
- SymbolInfoInteger
- SymbolInfoString
- SymbolInfoTick
- SymbolInfoSessionQuote
- SymbolInfoSessionTrade
Timeseries and Indicators Access
- Indexing Direction in Arrays, Buffers and Timeseries
- SeriesInfoInteger
- RefreshRates
- CopyRates
- CopyTime
- CopyOpen
- CopyHigh
- CopyLow
- CopyClose
- CopyTickVolume
- Bars
- iBars
- iBarShift
- iClose
- iHigh
- iHighest
- iLow
- iLowest
- iOpen
- iTime
- iVolume
Chart Operations
- ChartApplyTemplate
- ChartSaveTemplate
- ChartWindowFind
- ChartTimePriceToXY
- ChartXYToTimePrice
- ChartOpen
- ChartFirst
- ChartNext
- ChartClose
- ChartSymbol
- ChartPeriod
- ChartRedraw
- ChartSetDouble
- ChartSetInteger
- ChartSetString
- ChartGetDouble
- ChartGetInteger
- ChartGetString
- ChartNavigate
- ChartID
- ChartIndicatorDelete
- ChartIndicatorName
- ChartIndicatorsTotal
- ChartWindowOnDropped
- ChartPriceOnDropped
- ChartTimeOnDropped
- ChartXOnDropped
- ChartYOnDropped
- ChartSetSymbolPeriod
- ChartScreenShot
- Period
- Symbol
- WindowBarsPerChart
- WindowExpertName
- WindowFind
- WindowFirstVisibleBar
- WindowHandle
- WindowIsVisible
- WindowOnDropped
- WindowPriceMax
- WindowPriceMin
- WindowPriceOnDropped
- WindowRedraw
- WindowScreenShot
- WindowTimeOnDropped
- WindowsTotal
- WindowXOnDropped
- WindowYOnDropped
Trade Functions
- OrderClose
- OrderCloseBy
- OrderClosePrice
- OrderCloseTime
- OrderComment
- OrderCommission
- OrderDelete
- OrderExpiration
- OrderLots
- OrderMagicNumber
- OrderModify
- OrderOpenPrice
- OrderOpenTime
- OrderPrint
- OrderProfit
- OrderSelect
- OrderSend
- OrdersHistoryTotal
- OrderStopLoss
- OrdersTotal
- OrderSwap
- OrderSymbol
- OrderTakeProfit
- OrderTicket
- OrderType
Trade Signals
- SignalBaseGetDouble
- SignalBaseGetInteger
- SignalBaseGetString
- SignalBaseSelect
- SignalBaseTotal
- SignalInfoGetDouble
- SignalInfoGetInteger
- SignalInfoGetString
- SignalInfoSetDouble
- SignalInfoSetInteger
- SignalSubscribe
- SignalUnsubscribe
Global Variables of the Terminal
- GlobalVariableCheck
- GlobalVariableTime
- GlobalVariableDel
- GlobalVariableGet
- GlobalVariableName
- GlobalVariableSet
- GlobalVariablesFlush
- GlobalVariableTemp
- GlobalVariableSetOnCondition
- GlobalVariablesDeleteAll
- GlobalVariablesTotal
File Functions
- FileFindFirst
- FileFindNext
- FileFindClose
- FileIsExist
- FileOpen
- FileClose
- FileCopy
- FileDelete
- FileMove
- FileFlush
- FileGetInteger
- FileIsEnding
- FileIsLineEnding
- FileReadArray
- FileReadBool
- FileReadDatetime
- FileReadDouble
- FileReadFloat
- FileReadInteger
- FileReadLong
- FileReadNumber
- FileReadString
- FileReadStruct
- FileSeek
- FileSize
- FileTell
- FileWrite
- FileWriteArray
- FileWriteDouble
- FileWriteFloat
- FileWriteInteger
- FileWriteLong
- FileWriteString
- FileWriteStruct
- FolderCreate
- FolderDelete
- FolderClean
- FileOpenHistory
Custom Indicators
- HideTestIndicators
- IndicatorSetDouble
- IndicatorSetInteger
- IndicatorSetString
- SetIndexBuffer
- IndicatorBuffers
- IndicatorCounted
- IndicatorDigits
- IndicatorShortName
- SetIndexArrow
- SetIndexDrawBegin
- SetIndexEmptyValue
- SetIndexLabel
- SetIndexShift
- SetIndexStyle
- SetLevelStyle
- SetLevelValue
Object Functions
- ObjectCreate
- ObjectName
- ObjectDelete
- ObjectsDeleteAll
- ObjectFind
- ObjectGetTimeByValue
- ObjectGetValueByTime
- ObjectMove
- ObjectsTotal
- ObjectGetDouble
- ObjectGetInteger
- ObjectGetString
- ObjectSetDouble
- ObjectSetInteger
- ObjectSetString
- TextSetFont
- TextOut
- TextGetSize
- ObjectDescription
- ObjectGet
- ObjectGetFiboDescription
- ObjectGetShiftByValue
- ObjectGetValueByShift
- ObjectSet
- ObjectSetFiboDescription
- ObjectSetText
- ObjectType
Technical Indicators
- iAC
- iAD
- iADX
- iAlligator
- iAO
- iATR
- iBearsPower
- iBands
- iBandsOnArray
- iBullsPower
- iCCI
- iCCIOnArray
- iCustom
- iDeMarker
- iEnvelopes
- iEnvelopesOnArray
- iForce
- iFractals
- iGator
- iIchimoku
- iBWMFI
- iMomentum
- iMomentumOnArray
- iMFI
- iMA
- iMAOnArray
- iOsMA
- iMACD
- iOBV
- iSAR
- iRSI
- iRSIOnArray
- iRVI
- iStdDev
- iStdDevOnArray
- iStochastic
- iWPR
Working with Events
- EventSetMillisecondTimer
- EventSetTimer
- EventKillTimer
- EventChartCustom
Obsolete functions
List of MQL4 Functions
List of MQL4 Constants
更多
关于

Language Basics
- Syntax
- Data Types
- Operations and Expressions
- Operators
- Functions
- Variables
- Preprocessor
- Object-Oriented Programming
- Updated MQL4
Constants, Enumerations and Structures
- Chart Constants
- Objects Constants
- Indicator Constants
- Environment State
- Trade Constants
- Named Constants
- Data Structures
- Codes of Errors and Warnings
- Input/Output Constants
MQL4 programs
- Program Running
- Trade Permission
- Client Terminal Events
- Resources
- Call of Imported Functions
- Runtime Errors
- Operation of Programs in the Strategy Tester
Predefined Variables
- _Digits
- _Point
- _LastError
- _Period
- _RandomSeed
- _StopFlag
- _Symbol
- _UninitReason
- Ask
- Bars
- Bid
- Close
- Digits
- High
- Low
- Open
- Point
- Time
- Volume
Common Functions
- Alert
- CheckPointer
- Comment
- CryptEncode
- CryptDecode
- DebugBreak
- ExpertRemove
- GetPointer
- GetTickCount
- GetMicrosecondCount
- MessageBox
- PeriodSeconds
- PlaySound
- Print
- PrintFormat
- ResetLastError
- ResourceCreate
- ResourceFree
- ResourceReadImage
- ResourceSave
- SetUserError
- SendFTP
- SendMail
- SendNotification
- Sleep
- TerminalClose
- TesterStatistics
- TranslateKey
- WebRequest
- ZeroMemory
Array Functions
- ArrayBsearch
- ArrayCopy
- ArrayCompare
- ArrayFree
- ArrayGetAsSeries
- ArrayInitialize
- ArrayFill
- ArrayIsDynamic
- ArrayIsSeries
- ArrayMaximum
- ArrayMinimum
- ArrayRange
- ArrayResize
- ArraySetAsSeries
- ArraySize
- ArraySort
- ArrayCopyRates
- ArrayCopySeries
- ArrayDimension
Conversion Functions
- CharToString
- CharArrayToString
- ColorToARGB
- ColorToString
- DoubleToString
- EnumToString
- IntegerToString
- ShortToString
- ShortArrayToString
- TimeToString
- NormalizeDouble
- StringToCharArray
- StringToColor
- StringToDouble
- StringToInteger
- StringToShortArray
- StringToTime
- StringFormat
- CharToStr
- DoubleToStr
- StrToDouble
- StrToInteger
- StrToTime
- TimeToStr
Math Functions
- MathAbs
- MathArccos
- MathArcsin
- MathArctan
- MathCeil
- MathCos
- MathExp
- MathFloor
- MathLog
- MathLog10
- MathMax
- MathMin
- MathMod
- MathPow
- MathRand
- MathRound
- MathSin
- MathSqrt
- MathSrand
- MathTan
- MathIsValidNumber
String Functions
- StringAdd
- StringBufferLen
- StringCompare
- StringConcatenate
- StringFill
- StringFind
- StringGetCharacter
- StringInit
- StringLen
- StringReplace
- StringSetCharacter
- StringSplit
- StringSubstr
- StringToLower
- StringToUpper
- StringTrimLeft
- StringTrimRight
- StringGetChar
- StringSetChar
Date and Time
- TimeCurrent
- TimeLocal
- TimeGMT
- TimeDaylightSavings
- TimeGMTOffset
- TimeToStruct
- StructToTime
- Day
- DayOfWeek
- DayOfYear
- Hour
- Minute
- Month
- Seconds
- TimeDay
- TimeDayOfWeek
- TimeDayOfYear
- TimeHour
- TimeMinute
- TimeMonth
- TimeSeconds
- TimeYear
- Year
Account Information
- AccountInfoDouble
- AccountInfoInteger
- AccountInfoString
- AccountBalance
- AccountCredit
- AccountCompany
- AccountCurrency
- AccountEquity
- AccountFreeMargin
- AccountFreeMarginCheck
- AccountFreeMarginMode
- AccountLeverage
- AccountMargin
- AccountName
- AccountNumber
- AccountProfit
- AccountServer
- AccountStopoutLevel
- AccountStopoutMode
Checkup
- GetLastError
- IsStopped
- UninitializeReason
- MQLInfoInteger
- MQLInfoString
- MQLSetInteger
- TerminalInfoInteger
- TerminalInfoDouble
- TerminalInfoString
- Symbol
- Period
- Digits
- Point
- IsConnected
- IsDemo
- IsDllsAllowed
- IsExpertEnabled
- IsLibrariesAllowed
- IsOptimization
- IsTesting
- IsTradeAllowed
- IsTradeContextBusy
- IsVisualMode
- TerminalCompany
- TerminalName
- TerminalPath
Market Info
- MarketInfo
- SymbolsTotal
- SymbolName
- SymbolSelect
- SymbolInfoDouble
- SymbolInfoInteger
- SymbolInfoString
- SymbolInfoTick
- SymbolInfoSessionQuote
- SymbolInfoSessionTrade
Timeseries and Indicators Access
- Indexing Direction in Arrays, Buffers and Timeseries
- SeriesInfoInteger
- RefreshRates
- CopyRates
- CopyTime
- CopyOpen
- CopyHigh
- CopyLow
- CopyClose
- CopyTickVolume
- Bars
- iBars
- iBarShift
- iClose
- iHigh
- iHighest
- iLow
- iLowest
- iOpen
- iTime
- iVolume
Chart Operations
- ChartApplyTemplate
- ChartSaveTemplate
- ChartWindowFind
- ChartTimePriceToXY
- ChartXYToTimePrice
- ChartOpen
- ChartFirst
- ChartNext
- ChartClose
- ChartSymbol
- ChartPeriod
- ChartRedraw
- ChartSetDouble
- ChartSetInteger
- ChartSetString
- ChartGetDouble
- ChartGetInteger
- ChartGetString
- ChartNavigate
- ChartID
- ChartIndicatorDelete
- ChartIndicatorName
- ChartIndicatorsTotal
- ChartWindowOnDropped
- ChartPriceOnDropped
- ChartTimeOnDropped
- ChartXOnDropped
- ChartYOnDropped
- ChartSetSymbolPeriod
- ChartScreenShot
- Period
- Symbol
- WindowBarsPerChart
- WindowExpertName
- WindowFind
- WindowFirstVisibleBar
- WindowHandle
- WindowIsVisible
- WindowOnDropped
- WindowPriceMax
- WindowPriceMin
- WindowPriceOnDropped
- WindowRedraw
- WindowScreenShot
- WindowTimeOnDropped
- WindowsTotal
- WindowXOnDropped
- WindowYOnDropped
Trade Functions
- OrderClose
- OrderCloseBy
- OrderClosePrice
- OrderCloseTime
- OrderComment
- OrderCommission
- OrderDelete
- OrderExpiration
- OrderLots
- OrderMagicNumber
- OrderModify
- OrderOpenPrice
- OrderOpenTime
- OrderPrint
- OrderProfit
- OrderSelect
- OrderSend
- OrdersHistoryTotal
- OrderStopLoss
- OrdersTotal
- OrderSwap
- OrderSymbol
- OrderTakeProfit
- OrderTicket
- OrderType
Trade Signals
- SignalBaseGetDouble
- SignalBaseGetInteger
- SignalBaseGetString
- SignalBaseSelect
- SignalBaseTotal
- SignalInfoGetDouble
- SignalInfoGetInteger
- SignalInfoGetString
- SignalInfoSetDouble
- SignalInfoSetInteger
- SignalSubscribe
- SignalUnsubscribe
Global Variables of the Terminal
- GlobalVariableCheck
- GlobalVariableTime
- GlobalVariableDel
- GlobalVariableGet
- GlobalVariableName
- GlobalVariableSet
- GlobalVariablesFlush
- GlobalVariableTemp
- GlobalVariableSetOnCondition
- GlobalVariablesDeleteAll
- GlobalVariablesTotal
File Functions
- FileFindFirst
- FileFindNext
- FileFindClose
- FileIsExist
- FileOpen
- FileClose
- FileCopy
- FileDelete
- FileMove
- FileFlush
- FileGetInteger
- FileIsEnding
- FileIsLineEnding
- FileReadArray
- FileReadBool
- FileReadDatetime
- FileReadDouble
- FileReadFloat
- FileReadInteger
- FileReadLong
- FileReadNumber
- FileReadString
- FileReadStruct
- FileSeek
- FileSize
- FileTell
- FileWrite
- FileWriteArray
- FileWriteDouble
- FileWriteFloat
- FileWriteInteger
- FileWriteLong
- FileWriteString
- FileWriteStruct
- FolderCreate
- FolderDelete
- FolderClean
- FileOpenHistory
Custom Indicators
- HideTestIndicators
- IndicatorSetDouble
- IndicatorSetInteger
- IndicatorSetString
- SetIndexBuffer
- IndicatorBuffers
- IndicatorCounted
- IndicatorDigits
- IndicatorShortName
- SetIndexArrow
- SetIndexDrawBegin
- SetIndexEmptyValue
- SetIndexLabel
- SetIndexShift
- SetIndexStyle
- SetLevelStyle
- SetLevelValue
Object Functions
- ObjectCreate
- ObjectName
- ObjectDelete
- ObjectsDeleteAll
- ObjectFind
- ObjectGetTimeByValue
- ObjectGetValueByTime
- ObjectMove
- ObjectsTotal
- ObjectGetDouble
- ObjectGetInteger
- ObjectGetString
- ObjectSetDouble
- ObjectSetInteger
- ObjectSetString
- TextSetFont
- TextOut
- TextGetSize
- ObjectDescription
- ObjectGet
- ObjectGetFiboDescription
- ObjectGetShiftByValue
- ObjectGetValueByShift
- ObjectSet
- ObjectSetFiboDescription
- ObjectSetText
- ObjectType
Technical Indicators
- iAC
- iAD
- iADX
- iAlligator
- iAO
- iATR
- iBearsPower
- iBands
- iBandsOnArray
- iBullsPower
- iCCI
- iCCIOnArray
- iCustom
- iDeMarker
- iEnvelopes
- iEnvelopesOnArray
- iForce
- iFractals
- iGator
- iIchimoku
- iBWMFI
- iMomentum
- iMomentumOnArray
- iMFI
- iMA
- iMAOnArray
- iOsMA
- iMACD
- iOBV
- iSAR
- iRSI
- iRSIOnArray
- iRVI
- iStdDev
- iStdDevOnArray
- iStochastic
- iWPR
Working with Events
- EventSetMillisecondTimer
- EventSetTimer
- EventKillTimer
- EventChartCustom
Obsolete functions
List of MQL4 Functions
List of MQL4 Constants
更多
关于

Digits

小数位数

当前符号价格的小数点后的位数。

示例：

Print(DoubleToStr(Close[0], Digits));

另请参阅

MarketInfo()

最后更新于 2026-07-21

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