round2even

Performs round-to-even operation. This operation is more accurate than round-to-larger.

The round2even function performs round to even, which is different from round to larger. The return value is the number closest to the value of expression, with the appropriate number of decimal places. If expression is exactly halfway between two possible rounded values, the function returns the possible rounded value whose rightmost digit is an even number. (In a round to larger function, a number that is halfway between two possible rounded values is always rounded to the larger number.)

Note: Round to even is a statistically more accurate rounding algorithm than round to larger.

Note: Round to even is sometimes called banker's rounding.