Variable declaration question: for loop | Forex Factory

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Variable declaration question: for loop

  • #1
  • First Post: Apr 8, 2021 4:21pm Apr 8, 2021 4:21pm
why the variable declaration must be between the curly brackets of the for loop so it operate?

it even did not work when the variable were in global scope?


Inserted Code
 for( i=0;i<UncountedBars;i++)
   { double ValueSLMA = iMA(Symbol(),0,PeriodSLMA,MA_Shift,MA_Method,MA_AppliedPrice,i);
 double ValueFAMA = iMA(Symbol(),0,PeriodFAMA,MA_Shift,MA_Method,MA_AppliedPrice,i);
 double ValueSLMA_1 = iMA(Symbol(),0,PeriodSLMA,MA_Shift,MA_Method,MA_AppliedPrice,i+1);
 double ValueFAMA_1 = iMA(Symbol(),0,PeriodFAMA,MA_Shift,MA_Method,MA_AppliedPrice,i+1);
  • #2
  • Apr 8, 2021 6:42pm Apr 8, 2021 6:42pm
This is also valid:

Inserted Code
int i  = 0;
for(;i<UncountedBars;i++)
{
...
}

It doesn't have to be between curly brackets.
Always ready to help
  • #3
  • Apr 9, 2021 3:25am Apr 9, 2021 3:25am
but these 4 lines
Inserted Code
double ValueSLMA = iMA(Symbol(),0,PeriodSLMA,MA_Shift,MA_Method,MA_AppliedPrice,i);
 double ValueFAMA = iMA(Symbol(),0,PeriodFAMA,MA_Shift,MA_Method,MA_AppliedPrice,i);
 double ValueSLMA_1 = iMA(Symbol(),0,PeriodSLMA,MA_Shift,MA_Method,MA_AppliedPrice,i+1);
 double ValueFAMA_1 = iMA(Symbol(),0,PeriodFAMA,MA_Shift,MA_Method,MA_AppliedPrice,i+1);

At the beginning I though it will not make a difference if I declared them out of the curly brackets of for loop and then I can use only the variable in the for loop, but it did not work until I mode them to be with the curly brackets of the for loop

any explanation for this would help

here is the code if needed, but it will not work until the above four lines are moved to be within the curly brackets of for

Inserted Code
int UncountedBars = rates_total - prev_calculated;
 if(rates_total<=10)
   {
    return -1;
   }
   if(prev_calculated>0)
     {
      UncountedBars++;
     }
 
 for( i=0;i<UncountedBars;i++)
   {
 
 
   if(ValueSLMA>ValueFAMA&&ValueSLMA_1<ValueFAMA_1)
     {
      b1[i]=low[i];
     }
    
     if(ValueSLMA<ValueFAMA&&ValueSLMA_1>ValueFAMA_1)
     {
      b2[i]=high[i];
     }
   }
  • #4
  • Apr 9, 2021 3:30am Apr 9, 2021 3:30am
Those lines have to be between curly brackets because they make use of the variable i. This variable changes its value in each iteration of the for loop.
Always ready to help
  • #5
  • Apr 9, 2021 3:49am Apr 9, 2021 3:49am
Thank you so much
  • #6
  • Last Post: Apr 9, 2021 3:51am Apr 9, 2021 3:51am
You're welcome
Always ready to help
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