Welcome to the MQL Reference section, your comprehensive resource for all things related to MetaQuotes Language (MQL). Here, you will find detailed guides, tutorials, and references on MQL4 and MQL5 programming, designed to help traders and developers create efficient automated trading systems and custom indicators on the MetaTrader platform. Whether you are a beginner looking to learn the basics or an experienced programmer seeking advanced techniques, our MQL Reference section has you covered.
In MQL4 programming for MetaTrader 4 (MT4), multidimensional arrays can be used to manage data in rows and columns. This article will explain the basics of using multidimensional arrays in a way that […]
In MetaTrader 4 (MT4) MQL4 programming, arrays can be used to efficiently handle data. This article explains the basic usage of arrays in a way that beginners can understand. By using arrays, you can […]
In MetaTrader 4 (MT4) MQL4 programs, it is common to round double type values to a specified number of decimal places. This article explains how to normalize double type values using the NormalizeDoub […]
In MetaTrader 4 (MT4) MQL4 programming, converting various data types to strings makes it easier to display data and output logs. This article explains how to convert Char, Double, and DateTime data t […]
In MetaTrader 4 (MT4) MQL4 programming, converting strings to various data types (Integer, Double, DateTime) makes it easier to process input data. This article explains these conversion methods in a […]
In MetaTrader 4 (MT4) MQL4 programming, comparing double type values might not always work as expected for programmers. This article explains how to compare double type values using the NormalizeDoubl […]
PurposeThe DateTime type (datetime) is used to represent dates and times. This data type is expressed as the total number of seconds since January 1, 1970. DateTime type is very useful for recording s […]
Usage The color type (color) is used to represent colors. Colors are specified in the RGB format (red, green, blue), with each color component ranging from 0 to 255. Colors are used for graphical elem […]
Usage The string data type is used to represent text strings. For example, strings are necessary for usernames, messages, and currency pair symbols. In MQL4, ASCII strings up to 255 characters can be […]
Usage The character type (char) is used to represent a single character. Unlike other programming languages, MQL4 uses the int type to represent characters. This is because characters are treated as n […]
UsageThe real number type (double) is used to represent real numerical values that include decimals. The precision of real values is very high, making them especially useful in scenarios requiring pre […]
Purpose The integer type (int) is used to represent integer values. Integers are positive or negative numbers that do not include decimal points. In a program, they are used for various purposes such […]
Purpose The Boolean type (bool) is used to represent a state of either true or false. It is an essential data type in programming for determining whether specific conditions are met in control structu […]
Basic Structure of an EA An EA (Expert Advisor) is an automated trading program that runs on MetaTrader. Typically, an EA is composed of the following three main functions: Initial Settings (OnInit Fu […]