Function difficulty in MQL4 | Forex Factory

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Function difficulty in MQL4

  • #1
  • First Post: Jun 16, 2013 2:54am Jun 16, 2013 2:54am
Hi,
I only just started last week to learn a bit about coding EAs
I've been doing ok, but I am totally frustrated when it comes to using functions
I wrote some code as a function in a program to work out the lot size to be used according to equity balance, risk % and stop loss size.
I spent hours and hours trying to find out what I was doing wrong as I just kept getting errors when trying to compile it.
In the end, I simply inserted the code instead of the function call in the program. Not too difficult as it was only called twice. It compiled ok then

Obviously, I am making some sort of rookie mistake that is quite obvious to those with experience.

I even tried copying from examples and couldn't get them to compile either.

I attach a shot of a simple function and the compiler errors
Can somebody please tell me what I am doing wrong?
Attached Image
Please Do Not PM Me With Coding Enquiries
  • #2
  • Jun 16, 2013 3:23am Jun 16, 2013 3:23am
Quoting Gumrai
Hi, I only just started last week to learn a bit about coding EAs I've been doing ok, but I am totally frustrated when it comes to using functions I wrote some code as a function in a program to work out the lot size to be used according to equity balance, risk % and stop loss size. I spent hours and hours trying to find out what I was doing wrong as I just kept getting errors when trying to compile it. In the end, I simply inserted the code instead of the function call in the program. Not too difficult as it was only called twice. It compiled ok...
Yes.

User declared functions are done outside of any other function, in fact this applies to all functions, they are all separate entities. Book - Functions

Taking your example:

Inserted Code
int start()
   {
   int a = 10;
   int b = 20;

   int total = add(a, b);   // user defined function called within start()
   
   return(0);
   }

//  function declared outside of start()
int add(int x, int y)
   {
   return(x + y);
   }
20 pips a day isn't too much to ask . . .
  • #3
  • Last Post: Jun 16, 2013 4:16am Jun 16, 2013 4:16am
Thank you so much Raptor,
I knew that I must have been doing something obviously wrong.
That bit obviously hadn't sunk in. I knew that functions could call other functions, but functions could no be declared within other functions. I sort of didn't take into account that the start is a function itself.
Please Do Not PM Me With Coding Enquiries
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