MQL4 EA Properties Coding
Learning from MetaQuotes Moving Average EA Example
Access MetaQuotes Language Editor
Open Data Folder
Copy File Moving Average EA and Rename to New one
Check Properties and Activate Auto Trading
Check The original code Moving Average EA
Input variable MQL 4
Input variable with the input modifier can't be changed inside mql4-programs
input variables can be changed only by a user from the program properties window
Example in original code of moving average ea
input double Lots =0.1;
input double MaximumRisk =0.02;
input double DecreaseFactor=3;
input int MovingPeriod =12;
input int MovingShift =6;
Change The Variable Type from Original EA code
External variable or Extern Variable MQL4
Extern ones also determine the input parameters of an mql4 EA
They are available from the Properties window
Extern variables can be modified in the Properties window and MQL4 Program
so, we would add External variable in the properties part of EA and change input variable to extern variable code as below
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