向右滑动绿色条纹右侧实现先进的功能，从顶部向下滑动即可查看历史记录。滑动清除历史记录。

提示：

-calculate the nth root of a number (x) ---> x^(1/n)

/e.g.: the 5th root of 243 ---> 243^(1/5) = 3/

-base n logarithm calculation of a number (x) ---> log(x)/log(n)

/e.g.: base 3 logarithm of 6 ---> log(6)/log(3) = 1,6309.../

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The source code was forked from the AOSP platform package.