The input contains two floating numbers X and P.
Suppose that 0
The number P represents the precision, which only has four possible values in this problem: 1, 0.1, 0.01, and 0.001.
The task is to round off the number X with respect to the given precisoin P.
For example, if X is 0.4526 and P is 0.1, then the answer is 0.5000.
If X is 0.4526 and P is 0.01, then the answer is 0.4500. If X is 0.5678 and P is 1, then the answer is 1.0000.
[注意輸出的最後要換行]
Two floating point numbers X and P, where 0
The number after rounding off. The format should be the same as X: four digits after the decimal point.