MQL4 Basics

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1. Setting Up MetaEditor:

  • Open the MetaTrader 4 platform.
  • Click on “View” in the top menu and select “MetaEditor” or press F4.
  • MetaEditor is where you’ll write, compile, and manage your MQL4 code.

2. Basic Structure of an MQL4 Program:

  • OnInit(): This is the initialization function that runs once when the indicator or EA is attached to a chart.
  • OnTick(): This is the main function that executes on every tick (price change).

3. Variables and Data Types:

4. Operators:

  • Arithmetic (+, -, *, /, %)
  • Comparison (==, !=, >, <, >=, <=)
  • Logical (&&, ||, !)
  • Assignment (=, +=, -=, *=, /=, %=)

5. Control Structures:

Conditional Statements:


6. Functions:

7. Custom Indicators:

8. Expert Advisors (EAs):

9. Compiling and Running:

  • Press F7 to compile your code.
  • If there are no errors, you’ll see “0 errors, 0 warnings” in the ‘Experts’ or ‘Indicators’ tab.
  • Attach your EA or indicator to a chart in MetaTrader 4 to start using it.

This is just a basic introduction to MQL4. As you progress, you can explore more advanced topics like handling events, working with external files, and utilizing libraries.

Remember to thoroughly test your code on a demo account before using it in a live trading environment. Also, always keep backups of your code. Good luck with your MQL4 programming!

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