Flow of Boolean Logic (for MT4) | Forex Factory

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Flow of Boolean Logic (for MT4)

  • #1
  • First Post: Edited 11:05pm Aug 26, 2015 10:22pm | Edited 11:05pm
This is a basic question regarding boolean logic. Please see the code below.

Inserted Code
bool DT1B = false;
bool DT2B = false;
bool DT3B = false;
 
bool DT1S = false;
bool DT2S = false;
bool DT3S = false;
 
  if ((OrdersTotal() > 0) && (OrderType() == OP_BUY) && (MarketInfo(Trade,MODE_BID) > OrderOpenPrice() + (10*Point))) DT1B = true;
  if ((OrdersTotal() > 0) && (OrderType() == OP_BUY) && (MarketInfo(Trade,MODE_BID) > OrderOpenPrice() + (20*Point))) DT2B = true; DT1B = false;
  if ((OrdersTotal() > 0) && (OrderType() == OP_BUY) && (MarketInfo(Trade,MODE_BID) > OrderOpenPrice() + (30*Point))) DT3B = true; DT2B = false; DT1B = false;
// (etc., continues to X amount of Pips)
 
  if ((OrdersTotal() > 0) && (OrderType() == OP_SELL) && (MarketInfo(Trade,MODE_ASK) < OrderOpenPrice() - (10*Point))) DT1S = true;
  if ((OrdersTotal() > 0) && (OrderType() == OP_SELL) && (MarketInfo(Trade,MODE_ASK) < OrderOpenPrice() - (20*Point))) DT2S = true; DT1S = false;
  if ((OrdersTotal() > 0) && (OrderType() == OP_SELL) && (MarketInfo(Trade,MODE_ASK) < OrderOpenPrice() - (30*Point))) DT3S = true; DT2S = false; DT1S = false;
// (etc., continues to X amount of Pips)

Question 1:
For the statement,
IF ((OrdersTotal() > 0) && (OrderType() == OP_BUY) && (MarketInfo(Trade,MODE_BID) > OrderOpenPrice() + (30*Point)))
DT3B = true; DT2B = false; DT1B = false;

Will MT4 keep DT1B = false and DT1B = false even though in reality the actual is still true in that the market will be over OOP by 10 and 20 at that point as well? (In reality, if the market is plus 30, then it is also over 10 and over 20 as well.)

Question 2:
Once DT3B = true is activated and triggered, will it revert to false if the market falls below OOP plus 30?
  • #2
  • Aug 27, 2015 6:46am Aug 27, 2015 6:46am
Quoting Pipologist
Question 1: For the statement, IF ((OrdersTotal() > 0) && (OrderType() == OP_BUY) && (MarketInfo(Trade,MODE_BID) > OrderOpenPrice() + (30*Point))) DT3B = true; DT2B = false; DT1B = false;

Will MT4 keep DT1B = false and DT1B = false even though in reality the actual is still true in that the market will be over OOP by 10 and 20 at that point as well? (In reality, if the market is plus 30, then it is also over 10 and over 20 as well.) Question 2: Once DT3B = true is activated and triggered, will it revert to false if the market falls below...
I am only a self taught hobbyist, so this is my best guess...

1) I assume you mean DT2B and DT1B?? Refer bold.
In short yes.

If the IF statement is true then the resultant will be DT3B = true; DT2B = false; DT1B = false;

2) It will revert to false again on the next tick as the code runs from the top to bottom again.

PS I think you should be using { brackets after the IF statement if you want to have three semicolons.

i.e.
IF ((OrdersTotal() > 0) && (OrderType() == OP_BUY) && (MarketInfo(Trade,MODE_BID) > OrderOpenPrice() + (30*Point)))
{
DT3B = true;
DT2B = false;
DT1B = false;
}
What's it all about? It's all about money.
  • #3
  • Aug 27, 2015 6:53pm Aug 27, 2015 6:53pm
I realized later that it will revert to false again on the next tick as the code runs from the top to bottom again. So, I scrapped this code idea for now and tried a different routine to try to achieve what I need to test. Thank you for your input and comments.
  • #4
  • Aug 28, 2015 2:55pm Aug 28, 2015 2:55pm
Quoting Pipologist
I realized later that it will revert to false again on the next tick as the code runs from the top to bottom again. So, I scrapped this code idea for now and tried a different routine to try to achieve what I need to test. Thank you for your input and comments.
For your future reference:


1. A variable retains its previous value unless it's explicitly changed -- example:

if (x1==y1 && x2==y2 && x3==y3)
alpha=true;

If all of the conditions are met (x1=y1 AND x2=y2 AND x3=y3) then alpha will be set to true, otherwise the value of alpha will remain unchanged from whatever it was previously (i.e. it will NOT be set to false just because one or more of the conditions are not met).


2. The scope of an if statement extends only to the very next statement -- example:

if (x1==y1 && x2==y2 && x3==y3)
alpha=true; beta=true; gamma=true;

In this case alpha will be set to true only if the conditions are met (just as in example 1).
beta and gamma are not covered by the if statement, hence they will be set to true regardless of whether the conditions are met or not.


3. Exception -- to extend the scope of an if statement, use curly braces. Example:

if (x1==y1 && x2==y2 && x3==y3)
{ alpha=true; beta=true; gamma=true; }

In this case, if all of the conditions are met (x1=y1 AND x2=y2 AND x3=y3) then each of alpha, beta and gamma will be set to true, otherwise their values will remain unchanged from whatever they were previously.


Not sure if that's what you were asking, but I'll leave my post just in case it helps somebody else.
  • #5
  • Aug 28, 2015 9:45pm Aug 28, 2015 9:45pm
That is very clear. Thank you. Should help to alleviate future coding errors. I'm sure it will help many.
  • #6
  • Last Post: Aug 29, 2015 6:03am Aug 29, 2015 6:03am
Personally, I would format the code as below as it avoids repetition and helps me to follow the logic flow:

Inserted Code
   bool DT1B = false;
   bool DT2B = false;
   bool DT3B = false;
 
   bool DT1S = false;
   bool DT2S = false;
   bool DT3S = false;
   //-------------------------------------------------------------------------
   //--OrdersTotal() is common to all, so only check once - no point checking
   //--six times when once is enough
   //-------------------------------------------------------------------------
   if(OrdersTotal() > 0){
      
      
      //--you then have two conditions to check...
      //--first OP_BUY....
      if(OrderType() == OP_BUY){
        
         //--then test each condition
         if((MarketInfo(Trade,MODE_BID)) > (OrderOpenPrice() + (10*Point))){
            DT1B = true;
         }
         //--etc.....
        
        
      //--second OP_SELL....
      }else if(OrderType() == OP_SELL){
        
         if((MarketInfo(Trade,MODE_ASK)) < (OrderOpenPrice() - (10*Point))){
            DT1S = true;
         }
         //--etc....or,
        
      //--default if none of the conditions are true...  
      }else{
         Print("Neither condition met!");
      }
   }


Just another opinion.
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