please,what is wrong in my code??????,its for lot size calculation

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hello,thank you for any help

sometime the calculation function go wrong,whats happens???? last bug is this one, my accountequity is "<10000.00&&>9900.00" my ea must open position of 0.2 lot,but it open position of 0.1 lot ???????

here is the code

//+------------------------------------------------------------------+
//| expert start function                                            |
//+------------------------------------------------------------------+
 int start()
  
  
   
         {                 //lotsize calculation
           
             double Lot         = 0.00;
             double capital     = AccountEquity();
             
           
             if ( capital>=                  10000.00) {Lot=0.1;}
             if ( capital<10000.00&&capital>= 9900.00) {Lot=0.2;}
             if ( capital< 9900.00&&capital>= 9800.00) {Lot=0.3;}
             if ( capital< 9800.00&&capital>= 9700.00) {Lot=0.4;}
             if ( capital< 9700.00&&capital>= 9600.00) {Lot=0.5;}  
                      
          
 
Print your account equity so that you can check equity at the time of placing the trade Show your code for OrderSend Is there any other code that could change the value of Lot?
 
You also could simplify the code
double Lot         = 0.00;
double capital     = AccountEquity();
if ( capital>=                  10000.00) {Lot=0.1;}
if ( capital<10000.00&&capital>= 9900.00) {Lot=0.2;}
if ( capital< 9900.00&&capital>= 9800.00) {Lot=0.3;}
if ( capital< 9800.00&&capital>= 9700.00) {Lot=0.4;}
if ( capital< 9700.00&&capital>= 9600.00) {Lot=0.5;}
double capital     = AccountEquity();
if (      capital <  9600.00) {double Lot=0.0;}
else if ( capital <  9700.00) {Lot=0.5;}
else if ( capital <  9800.00) {Lot=0.4;}
else if ( capital <  9900.00) {Lot=0.3;}
else if ( capital < 10000.00) {Lot=0.2;}
else                          {Lot=0.1;}
 
yes is better like this,thank you
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