! certain action is assigned to each of them# and they cannotbe used for other purposes+ĭata ty,es Memory classes $,erators $t#er The identifiers listed below are fied reser"ed words. The identifier must not coincide with any reser"edword. &ymbols you can use+ the numbers 2-3# Latin capital and small letters a-# !-5 (recognied as different symbols)# thesymbol of underlining (6). The length of an identifier cannot eceed 01characters. %dentifiers are used as names of "ariables# functions# and data types. &inglecomments start with symbols# end with the symbol of a new line and can be nested into multi line comments.$omments are allowed where blan spaces are possible and tolerate any number of spaces. Multi line comments start with / symbols and end with / symbols. ou should use tab symbols to enhance the readability of the tet. ou can use any amount of such symbols instead &paces# tabs# line feedform feed symbols are used as separators. Libraries are user functions libraries where fre'uently used blocs of user programs are stored. ,nlie Epert !d"isors# &cripts are notrun tic wise and ha"e no access to indicator functions. &cripts are programs intended for single eecution of some actions. Lie built-in indicators# theycannot mae deals automatically and are aimed only at implementing analytical functions. %n other words# $ustom %ndicators allow to createtechnical indicators in addition to those already integrated into client terminal. $ustom %ndicators are an analogue of a technical indicator. Lie most trade systems# the terminal supports testing strategieson historical data with displaying on the chart the spots where trades come in and out. The !d"isor can not onlyinform you about a possibility to strie bargains# but also can mae deals on the trade account automaticallyand direct them right to the trade ser"er. *rograms written in MetaQuotes Language 4 ha"e different features and purposes+Įpert !d"isors is a mechanical trade system (MT&) lined up to a certain plot. ! brief guide contains functions di"ided into categories# operations# reser"edwords# and other language constructions and allows finding the description of e"ery element we use. !s an information boo for MQL4 language weuse MetaQuotes Language ictionary. %t helps users to orient in the epert system tet 'uite easily. The MetaEditor 4 tet editor that highlights different constructions of MQL4 language is used for writing the programcode. There are also basic indicators built in and commands of orderplacement and control. ! large number of functions necessary for the analysis of the current and past 'uotations# the basic arithmetic andlogic operations are included in MQL4 structure. !lso# with the help of MQL4 you can create your own $ustom %ndicators#&cripts and Libraries of functions. This language allowsto create your own Epert !d"isors that render the trade process management automatic and are perfectly suitablefor implementing your own trade strategies. MetaQuotes Language 4 (MQL4) is a new built-in language for programming trading strategies. +-+Įxtern string TimeFrame = "Current time frame" Įxtern double UpperArrowDisplacement = 0.2 Įxtern double LowerArrowDisplacement = 0.MQL4 quick referenceAccount InformationArray FunctionsCommon functionsConversion functionsĬustom Indicator functionsDate & Time functionsFile functionslo!al "aria!les functionsMat# & Trig$!%ect functionsre'defined "aria!les(tandard Constants(tring functionsTec#nical Indicator callsTrading functions)indo* functionsĪ!out MetaQuotes Language 4(ynta+Data ty,es$,erations & -+,ressions$,eratorsFunctions"aria!lesre,rocessor
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