Boolean combination.

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[Deleted]  

Today i encountered a problem but i have no idea why it's happen. 

bool a,b,c;

..........//do stuff
..........
//now a,b,c are all true. I tested them:

if(a){
Alert("a");  
}
if(b){
Alert("b");      // All a,b,c true, and these three alert does appear.
}
if(c){
Alert("c");
}

But when I erased all three if statements above and replace them with

if(a && b && c){        //Alert "Stuff 1" doesn't appear even though a,b,c are all true.
Alert("Stuff 1");  
}
else if(b && c){
Alert("Stuff 2");      // Only this else if(b && c) execute and make Alert "Stuff 2".
}

Can someone please help me?

 

I executed the following code in the init() of an EA . . .

   bool a = true, b = true, c = true;
   if (a && b && c)
      Print ("Test Successful!");
   else
      Print ("Test Failed.");

. . . and it produced the following output into the journal/log:

15:17:08 TestingEA EURUSD,H1: loaded successfully

15:17:09 TestingEA EURUSD,H1: Test Successful!

15:17:09 TestingEA EURUSD,H1: initialized

15:17:21 TestingEA EURUSD,H1: deinitialized

15:17:21 TestingEA EURUSD,H1: uninit reason 1

15:17:21 TestingEA EURUSD,H1: removed

Are you sure your a, b, and c are actually set to true? Remember: if you declare a bool variable without assigning it an initial value (true or false), the variable will be initialized to false (0). See Initialization of Variables.
[Deleted]  

Yes. I'm sure they are set to true. Here is the code:

if(NewBar()){            //boolean a
Alert("a ");
}
if(r){                   //boolean b
Alert("b");
}
if(Rcount>=29){          //boolean c
Alert("c");
}
if(NewBar()&& r && Rcount>=29){
Alert("a b c");
}

when the conditions are satisfied, this is what i receive in the Alert box. The 4th if statement didn't execute.

 
Erik1:

Today i encountered a problem but i have no idea why it's happen.

But when I erased all three if statements above and replace them with

Can someone please help me?

Why are you doing a bitwise AND on a bool ?
 
RaptorUK:
Why are you doing a bitwise AND on a bool ?

Hmmm . . . looks to me like the OP is using a Logical AND (&&), rather than a bitwise AND (&).
 
Thirteen:
Hmmm . . . looks to me like the OP is using a Logical AND (&&), rather than a bitwise AND (&).
I could have sworn I saw a single & . . .
[Deleted]  

I had test all 4 seperately, and only the first three works. The combine one doesn't. I also did.

if(r && Rcount>=29){
Alert("b c");
}

This one pops up just fine. So i though it might be gotta do with the NewBar() one. 

int count;
bool NewBar()          //return true when new bar or candle appear on the chart
{
if (count!=iBarShift(NULL,0,0))
{
count=iBarShift(NULL,0,0);
return(true);
}
return(false);
}

I had been staring at this one for so long and yet no clue.

 
Erik1:

I had test all 4 seperately, and only the first three works. The combine one doesn't. I also did.

This one pops up just fine. So i though it might be gotta do with the NewBar() one.

I had been staring at this one for so long and yet no clue.

What happens if you hit max bars on chart ?
[Deleted]  
I'm sorry. I don't quite get what you mean by hit max bars on chart.
 
Erik1:
I'm sorry. I don't quite get what you mean by hit max bars on chart.
If the number of bars on your chart = max bars on chart the number will not increase . . . doesn't your new bar check fail in that circumstance ?
[Deleted]  
The max bar in chart is 65000, and currently, the number of bars on my chart is 2249, i don't think that's the case RaptorUK.
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