Just found that there are many other rounding methods : (From http://en.wikipedia.org/wiki/Rounding )
1 Types of rounding 2 Rounding to a specified increment 3 Rounding to integer 4 Tie-breaking 4.1 Round half up 4.2 Round half down 4.3 Round half away from zero 4.4 Round half towards zero 4.5 Round half to even 4.6 Round half to odd 4.7 Stochastic rounding 4.8 Alternating tie-breaking 5 Dithering and error diffusion 6 Rounding to simple fractions 7 Scaled rounding 8 Round to available value 9 Floating-point rounding 10 Double rounding 11 Exact computation with rounded arithmetic 12 The table-maker's dilemma 13 History 14 Rounding functions in programming languages 15 Other rounding standards 15.1 U.S. Weather Observations 15.2 Negative zero in meteorology 16 See also 17 External links 18 References