G中的四舍五入

风潇水涵UID: 3365443

刚看数学词汇，想到四舍五入，是最简单的，还是那种 看前一位是偶数还是奇数的那种

eg.

1.345 保留两位小数

最简单的：1.35  
later: 1.34

thx

qwe1__rty2UID: 3399223

根据math convention：

When a positive number is to be rounded to a certain decimal place and the number is halfway
between the two nearest possibilities, the number should be rounded to the greater possibility. For
example, 23.5 rounded to the nearest integer is  24, and 123.985 rounded to the nearest 0.01 is
123.99. When the number to be rounded is negative, the number should be rounded to the lesser
possibility. For example,  -36.5 rounded to the nearest integer is     - 37
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应该是最简单的那种