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Round-by-chop: The base-expansion of is truncated after the ()-th digit. This rounding rule is biased because it always moves the result toward zero. Round-to-nearest: () is set to the nearest floating-point number to . When there is a tie, the floating-point number whose last stored digit is even (also, the last digit, in binary form, is equal ...
Break ties by rounding either to an even digit (default), or away from zero. Round to −∞: Round to a value less than or equal to the original number. If the original number is positive, this is equivalent to truncation. Round to +∞: Round to a value greater than or equal to the original number. If the original number is negative, this is ...