The paper introduces teaching content of Newton iteration algorithm in C language programming, and analysis its teaching difficulties.

介绍了C语言中牛顿迭代算法的教学内容，并分析了其教学难点。

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Based on the analysis of the look-up table method and Newton iteration algorithm the paper improves the Newton iteration method for the square root calculation.

在分析了查表法以及牛顿迭代法的基础上，对开平方计算的牛顿迭代法进行了改进。

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In respect of programming, the improved Newton iteration algorithm is associated with function designations, therefore input and transfer of nonlinear functions are solved.

在编程技术方面，将改进的牛顿迭代法与函数调用相结合，解决了非线性函数的输入与转移问题。

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