how to get the positions of macd ? help! thanks

[[Deleted]]

how to get the positons of macd (a, b,c) ? please help me,thanks ! i have write some codes of that,but it is wrong when i test,i don't know why ?can you help me ?

#include <stdlib.mqh>
#include <WinUser32.mqh>
#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 Red
#property indicator_color2 Blue
int macd[];
double buffer1[];
double buffer2[];
double MacdCurrent,SignalCurrent,MacdPrevious,SignalPrevious;
int init()
{
//---- drawing settings
SetIndexStyle(0,DRAW_ARROW,STYLE_SOLID,3);
SetIndexArrow(0,233);
SetIndexBuffer(0,buffer1);

SetIndexStyle(1,DRAW_ARROW,STYLE_SOLID,3);
SetIndexArrow(1,234);
SetIndexBuffer(1,buffer2);
return(0);
}

int start()
{

int j=0;
int i=0;
MacdCurrent=0.0;
SignalCurrent=0.0;
MacdPrevious=0.0;
SignalPrevious=0.0;
if (j<3)
{
MacdCurrent=iMACD(NULL,0,8,21,5,PRICE_CLOSE,MODE_MAIN,i);
SignalCurrent=iMACD(NULL,0,8,21,5,PRICE_CLOSE,MODE_SIGNAL,i);
MacdPrevious=iMACD(NULL,0,8,21,5,PRICE_CLOSE,MODE_MAIN,i+1);
SignalPrevious=iMACD(NULL,0,8,21,5,PRICE_CLOSE,MODE_SIGNAL,i+1);

if((MacdCurrent > SignalCurrent &&MacdPrevious<SignalPrevious)
||(MacdCurrent < SignalCurrent &&MacdPrevious>SignalPrevious))
{
macd[j]=i;
j=j+1;
}
i++;
}

Comment(macd[0]," : ",macd[2]," : ",macd[3]);

return (0);
}