To round is to delete or(66)one or more of the least significant digits in a positional(67)and to, or not to, adjust the part re

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问题 To round is to delete or(66)one or more of the least significant digits in a positional(67)and to, or not to, adjust the part retained in accordance with some specified rule. The purpose of rounding is usually to limit the (68) of the numeral or to reduce the number of characters in the numeral, or to do both these things.The most common arithmetic forms of rounding are rounding down, rounding up and rounding off. Rounding down is defined as making no adjustment to the part of the numeral that is retained. Rounding up means adjusting the part of the numeral that is retained by adding 1 to the least significant of its digits and executing any necessary carries, if and only if One or more non-zero digits have been deleted. Rounding off (69) adjusting the part of the numeral retained by adding 1 to the least significant of its digits and executing any necessary carries, if and only if the most significant of the digits deleted was equal to or greater than half the(70) of its digit place.

选项 A、basis
B、radix
C、foundation
D、benchmark

答案A

解析 “舍入”是在位置表示中,删除或略去各最低有效位中的一位或几位;保留的部分或按某一规定的规则做出调整,或不做调整。舍入的目的通常是为了限定数字的精度,或减少其中的字符数,或兼而为之。最常见的运算舍入形式有“下舍入”、“上舍入”和“四舍五入”。下舍入定义为不调整被保留的数字部分。上舍入意指按如下规则调整被保留的数字部分:当且仅当已经删除的数位中有一个或几个非“零”时,在保留部分的最低有效位上加1,并进行必要的进位。四舍五入则指按如下规则调整被保留的数字部分:当且仅当所删去部分的最高有效位大于或等于该数位的基数的一半时,在保留部分的最低有效位上加1,并进行必要的进位。
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