significant digits

基本解释

The function that allows the elimination in the result of the calculation of all digits beyond the least significant digit.
允许消去答数中最低有效数字位以下的全部数字位的功能。
If the first non-significant digit is 5, and all subsequent digits are 0, the last significant digit is rounded to the nearest even digit. See the example that follows.
如果第一个要舍入的数是5，后面其他的位都是0，那么这个数就会被舍入到最近的偶数。
Another advantage is that you can use format specifiers other than %s, so that, for example, you can control how many significant digits the string form of a floating-point number should display.
另一个好处是你能使用不同于%s的格式化标识符，例如，以便于你能控制更多的重要的数字怎样显示浮点数字的字符串格式。

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the figures of a number that express a magnitude to a specified degree of accuracy, rounding up or down the final figure