Thanks all for your views.From the discussion I found that:
1. Sale / purchase Same day
2. Profit Calculation at the day end
3. Any profit and loss amount (in cash) we need to pa the same day.
4. Shares will be actually purchased and sold same day.
5. If not sold those will be automatically sold at the day end at closing price of share.
But what will happen if in the case of loss, the difference amount is not in the account of trader.