Forex : Profit And Loss and Floating Profit And Loss

You can't Knowing if you earn or lose as long as you close the deal , when you open deal by buying a currency , you can't know the result of this deal even closing the deal and sell it , For example if you buy 1 Lot in Pound at any price on basis you expect rising in the price,and after buying it the pound start decreasing 10 pips instead of rising , you in this instant is losing 100 Dollars assuming that point value equal 10 Dollars , in the sense that you make selling in this instant at a price of the current market which less than the buying price of pound 10 pips your loss will be 100 Dollars 

Let us assume that the price decreased 30 pips from the price of purchase , you in this instant is losing 300 Dollars , but it's not real , as long as you didn't closed the deal ,and didn't sold the Lot you have , the name of your loss called floating loss , it's not real loss , as long as you didn't sell ...everything is possible , the price maybe rise to 60 or 70 or 80 pips , and the price maybe rise suddenly and vise versa in profit case