A、擬舍棄數(shù)字的最左一位數(shù)字小于5,則進(jìn)一,保留其余各位數(shù)字不變
B、擬舍棄數(shù)字的最左一位數(shù)字大于5,則舍去,即保留數(shù)字的末尾數(shù)字加1
C、擬舍棄數(shù)字的最左一位數(shù)字是5,且其后有非0數(shù)字時(shí)進(jìn)一,即保留數(shù)字的末尾數(shù)字不變
D、擬舍棄數(shù)字的最左一位數(shù)字是5,且其后無數(shù)字或皆為0時(shí),若所保留的末位數(shù)字為奇數(shù)則進(jìn)一,即保留數(shù)字的末尾數(shù)字加1;若所保留的末位數(shù)字為偶數(shù),則舍去