Where is the wrong ? so simple codes,but...

[[Deleted]]

#property copyright "Copyright ?2009, MetaQuotes Software Corp."
#property link "https://www.metaquotes.net/"

#property indicator_separate_window
#property indicator_minimum 0
#property indicator_maximum 6
#property indicator_buffers 1
#property indicator_color1 Blue
int Week[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
//---- indicators

SetIndexBuffer(0,Week);
SetIndexStyle(0,DRAW_HISTOGRAM,STYLE_DASH,1);

//----
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function |
//+------------------------------------------------------------------+
int deinit()
{
//----

//----
return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
int start()
{
int counted_bars=IndicatorCounted();
//----
int i = Bars-counted_bars-1;

datetime di=0;

while(i>=0)
{
di=Time[i];
Week[i]=TimeDayOfWeek(di);//Returns the zero-based day of week (0 means Sunday,1,2,3,4,5,6) for the specified date.
i--;
}
//alert(Week[2]);
// i=TimeDayOfWeek(D'2004.11.2 13:45:45');
// Alert(i);


//----
return(0);
}
//+------------------------------------------------------------------+

But nothing was drawn. I know the codes are not usefull for trading, I coded it just for practice. I am a beginnger.

Anyone tell me where is the wrong ?

[blogzr3]

Change:

int Week[];

To:

double Week[];

[[Deleted]]

blogzr3 wrote >>

Change:

int Week[];

To:

double Week[];

Yes,you are right ! It does work.

Thank you.

But why? the return value type is int,why it should change to double ?

int TimeDayOfWeek(

datetime date)

Returns the zero-based day of week (0 means Sunday,1,2,3,4,5,6) for the specified date.

[[Deleted]]

Maybe arrays for indicator buffers should be type of double.

I checked some examples in the MQL4 book,arrays used for indicator buffers are declared as double.

Anyway,Thank you blogzr3 !

[blogzr3]

This is the important bit:

bool SetIndexBuffer(int index, double array[])

You are welcome!