题目内容

给定程序MODll．C中函数fun的功能是：根据以下公式求π值，并作为函数值返回。
例如，给指定精度的变量eps输入0．0005时，应当输出Pi＝3．141480。
请改正程序中的错误，使它能得出正确结果。
注意：不要改动main函数，不得增行或删行，也不得更改程序的结构。

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