"RETURN" statement formatting in MT4 | Forex Factory

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"RETURN" statement formatting in MT4

  • #1
  • First Post: Jun 26, 2015 12:10am Jun 26, 2015 12:10am
I should be way beyond this question by now, but I think it's important not only for me but also for other MT4 coders still learning coding/coding in MT4.

My question is regarding the use of return; in MT4

Example:

Inserted Code
void Tranche1Buy() {
int result = OrderSend(Trade,OP_BUY,Lots,Ask,MaxSlippage,0,0,"Open LONG Tranche 1",Tranche1Buy,0,Cyan);
Print("OPENED Buy Order Tranche 1", " # ", result, ", Open Trades: ",  OrdersTotal());
if (result <= -1) { Print("ERROR WHILE TRYING TO OPEN Tranche 1 BUY ORDER! ERROR CODE # ", GetLastError()); }
NewTrade == false;
return; }

Where does return; return to in the above example? Does it go back to the beginning of the loop at: void Tranche1Buy() { here
and repeat void Tranche1Buy() ?

Or does it go out of the loop to the next level of {

Would this be more appropriate if I wanted it to go out of the loop and NOT repeat Tranche1Buy()

Inserted Code
void Tranche1Buy() {
int result = OrderSend(Trade,OP_BUY,Lots,Ask,MaxSlippage,0,0,"Open LONG Tranche 1",Tranche1Buy,0,Cyan);
Print("OPENED Buy Order Tranche 1", " # ", result, ", Open Trades: ",  OrdersTotal());
if (result <= -1) { Print("ERROR WHILE TRYING TO OPEN Tranche 1 BUY ORDER! ERROR CODE # ", GetLastError()); }
NewTrade == false; }
return;
  • #2
  • Jun 26, 2015 12:30am Jun 26, 2015 12:30am
I just reviewed the MT4 doc at the MT4 site http://book.mql4.com/operators/function and see that I am asking the wrong question.

In my 1st code example above it seems that I could just as easily not have included the return; and it should still execute the same way. Is this correct?
  • #3
  • Edited 1:44am Jun 26, 2015 1:33am | Edited 1:44am
Yeah this is basic stuff. You cannot build code without the basics.
Btw, you have no loop(s) in there.
A loop is initiated with a "for" or "while" statement; you have neither nor.
You have simply a function - when called program flow is transferred from calling scope to the function. The "return" statement simply returns (transfers) program flow back to the caller..
You can (always) use return to prematurely exit a function if necessary. "Void" functions do not necessarily require a "return" statement because they do not return a result.
Non-void functions require a "return" statement with a result of appropriate type.
Return statements cannot reside in the global scope, meaning they have to be within a function.
Return To Disorder
  • #4
  • Last Post: Jun 26, 2015 1:36am Jun 26, 2015 1:36am
Quoting Pipologist
I just reviewed the MT4 doc at the MT4 site http://book.mql4.com/operators/function and see that I am asking the wrong question. In my 1st code example above it seems that I could just as easily not have included the return; and it should still execute the same way. Is this correct?
Yes, it's correct.

My advice, is that return statements should be used on preconditions, e.g. before executing the main code in a function.

Example:

Inserted Code
int MyFunction() {
 
   if( ! Precondition1 ){
      return -1; // some error indication.
   }
 
   if( !Precondition2 ) {
      return -2; // some other error indication.
   }
 
   // here goes the main code of this function.
 
   // And finally we return no error code.
   return 0;
}
Simplicity is the Ultimate Sophistication.
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