SQL Server division returns zero

While trying a small piece of code. I've happened to face a problem with division by any value on an integer is returning zero. 


Tried changing the destination value as decimal but still no effect.






print  @PrevEff  print @PrevCost print @PrevUsefulCost  
print @CurrEff
declare @finalcost decimal(10,2)
set @finalcost = @PrevEff  / @PrevUsefulCost  
print @finalcost

----------The above statements provided 0 as the output.....


Now, I've tried changing the manipulation part as Casting to float and process it... OOPS... it's working like a charm.....

print  @PrevEff  print @PrevCost print @PrevUsefulCost  
print @CurrEff
declare @finalcost decimal(10,2)
set @finalcost =  CAST(@PrevEff AS float) / CAST(@PrevUsefulCost  AS float)
print @finalcost


 Cheers,
Venkatesan Prabu .J