// 拉格朗日.cpp : Defines the entry point for the console application.//#include "stdafx.h"#include "math.h"#include "stdio.h"//构造求基函数的函数void lagelangri(double x,int n,double x1[],double y[]){int i,k; double L=0,p=0;for(i=0;i<=n;i++){ double sum=1;for(k=0;k<=n;k++)//求分母{ if(i!=k) {sum*=((x-x1[k])/(x1[i]-x1[k]));}} L=L+sum*y[i];}printf("最终的运算结果为：%d\n",L);}void main(){ double x=0.596;int n=5;double x1[6]={0.40,0.55,0.65,0.80,0.90,1.05}; double y[6]={0.41075,0.57815,0.69675,0.88811,1.02652,1.25386}; lagelangri(x,n,x1,y);}