Format the calculation result back to a String object by using NumberConverter again.

通过再次使用NumberConverter，来将计算结果格式化回至String对象。

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When the code is compiled or interpreted, your "0.1" is already rounded to the nearest number in that format, which results in a small rounding error even before the calculation happens.

当代码被编译或者解释运行时，“0.1”已经被近似转化为这种形式下最接近的一个浮点数，这导致在计算还没有真正开始之前，一个微小的舍入误差就已经存在了。

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The format of data, PI regulation method, speed calculation and generation of sine and cosine are explained in details.

并对程序中数据的格式处理、PI控制的数字实现、速度计算方法和正余弦函数的计算做了详细的讲解和说明。

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