Rounding Off

Question

what is the output of the following statements : Console.WriteLine(decimal.Round(Convert.ToDecimal("0.05"), 1)); --0.0-- Console.WriteLine(decimal.Round(Convert.ToDecimal("0.15"), 1)); --0.2-- Inference: 5 at 2nd decimal place is rounded to 1 if first decimal places is non-zero else zero Why? How are decimal maintained by .net

vaibhav kadian · Answer

thanks mate

Sam · Answer

The decimal.Round version that take 2 parameters rounds midpoints to the even number (Banker's Rounding) rather than rounding them away from zero i.e decimal.Round(0.05 1); // 0.0 decimal.Round(0.15 1); // 0.2 decimal.Round(0.25 1); // 0.2 decimal.Round(0.25 1); // 0.2 decimal.Round(0.35 1); // 0.4 etc. To get 'normal' rounding (midpoints are rounded away from zero) you can use a overloaded version of the decimal.Round method that takes a thrid parameter which specifies how to treat midpoints: ie decimal.Round(0.05 1 MidpointRounding.ToEvent ); // 0.0 Banker's Rounding decimal.Round(0.05 1 MidpointRounding.AwayFromZero ); // 0.1 Hope this helps Sam