This was made in Function tab

 

int calculations.CalculateDays(date start_date, date end_date)
{
    Days = (((input.end_date - input.start_date)  /  86400000)).toLong();
    return Days;
}

 

Now I want to display the value of "Days" in form

 

i tried input.Days=input.Days; but not working

 

How to do it. Any idea