Wrong iRSI?

[lorenzomia]

Hi, I am very new to mql5 so I  apologize...

When I do something such as...

int rsi;
rsi = iRSI(_Symbol, PERIOD_H1, 21, PRICE_CLOSE);

Alert(rsi);

The result is.. for example  10 ... however when I  go to the chart and add an RSI with the same values, the result is like 48 ... 

What am I doing wrong?

Also on a side question.. where is the output of printf going?  How can I see it ?

Thank you.

[Slava]

First of all you should read documentation. Especially https://www.mql5.com/en/docs/indicators

iRSI just returns created indicator's handle