数据插值的基本出发点是根据函数f(x)的一组数据{xi,f(xi)}(i=0,1,…,n),按照插值条件构造简单易算的函数P(x)去近似f(x)。本代码用高级程序设计语言实现Lagrange插值，-The basic starting point of data interpolation is based on the function f (x) of a set of data (xi, f (xi)) (i = 0,1, ..., n), constructed in accordance with terms of simple interpolation operator function P (x) to the approximate f (x). This code is used to achieve high-level programming language, Lagrange interpolation,