Problem with MT4 errors

Hello,
I got 3 errors by programming an indikator, but I couldn´t find the mistakes.
I hope a more experience trader can help me. Here is the code:


//+------------------------------------------------------------------+
#property copyright ""
#property link ""

#property indicator_chart_window
#property indicator_buffers1
#property indicator_color1 Red


#property indicator_width1 3


//+------------------------------------------------------------------+

//+------------------------------------------------------------------+
double ExtMapBuffer1[];

double R[];
//+------------------------------------------------------------------+
int init(){
SetIndexStyle(0,DRAW_ARROW);
SetIndexArrow(0,135);
SetIndexBuffer(0,ExtMapBuffer1);
SetIndexStyle(0,DRAW_ARROW);
SetIndexEmptyValue(0,0.0);





return(0);
}
//+------------------------------------------------------------------+
int start(){
int i,j,pos;
for(i=Bars-IndicatorCounted()-1;i>=0;i--){


double Range = ((iHighest(NULL,0,MODE_HIGH,i+10,i))-(iLowest(NULL,0,MODE_LOW,i+10,i)))

R[i]=Range ;



for(j=1;j<=20;j++){


if (R[i] > R[i+j] )
break;

if (j==20)
{ExtMapBuffer1[i] = High[i] + (High[i] - Low[i])/2;}


}
}

return(0);
}


And here are the errors:

'R' - an operator expected (87, 2)
'=' - assignment expected (85, 14)
'R' - semicolon expected (87, 2)

Post code in code tags as that prevents the editor from reformatting/mangling it. See the '#' or 'php' icons in the editors toolbar, or write the tags yourself:
[ CODE]
my code. Tags without spaces in them.
[ /CODE]

You cannot use an array without initializing it. R is not initialized. Indicator buffers are initialized by the SetIndexBuffer() command. See:
ArrayInitialize()
ArrayIsSeries()

The line setting the value of range has no ending semicolon.

Thank you very much! Now, the errors are gone.

And I will follow the code format in future.