非线性方程求根的各种算法的比较，

//求非线性方程的根

//程序中共给出了以下几种方法求非线性方程的根

// (1)二分法 (2)牛顿法 (3)普通迭代法 (4)斯蒂芬森迭代法 (5)弦截法

//程序中用到的函数为： f(x)=x^3-x-1

//其中:(1)普通迭代法用的迭代函数为：x=(x+1)^(1/3)

// (2)斯蒂芬森迭代法用的迭代函数为：x=x^3-1-Root of all kinds of non-linear equation algorithm,// for the root of nonlinear equations// process the CPC method gives the following nonlinear equations for root// (1) dichotomy (2) Newton method (3) the general iterative method (4) iterative method Stephenson (5) string cut-off method// process used for the function: f (x) = x ^ 3-x-1// one: ( 1) the general iterative method used for the iteration function: x = (x+1) ^ (1/3)// (2) Stephenson iterative method used for the iteration function: x = x ^ 3-1