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.
允許消去答數中最低有傚數字位以下的全部數字位的功能。
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.
如果第一個要捨入的數是5，後麪其他的位都是0，那麽這個數就會被捨入到最近的偶數。
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.
另一個好処是你能使用不同於%s的格式化標識符，例如，以便於你能控制更多的重要的數字怎樣顯示浮點數字的字符串格式。

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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