Newton_erfen.rar_newton_二分法

// fuction.cpp: implementation of the fuction class. // ////////////////////////////////////////////////////////////////////// #include "fuction.h" ////////////////////////////////////////////////////////////////////// // Construction/Destruction ////////////////////////////////////////////////////////////////////// fuction::fuction() { jingdu=0.000000000000000000001; } fuction::~fuction() { //构造函数重载 } fuction::fuction(double a,double b,double p) { left=a; right=b; point=p; } //二分函数 double fuction::erfen() { point=point-f(point)/daoshu(point); cout<<setiosflags(ios::fixed)<<setprecision(10)<<point<<endl; if(f(point)>jingdu||f(point)<-jingdu) { erfen(); } return point; } //输入函数区间函数 void fuction::getqujian() { cout<<"输入函数区间："<<endl; cin>>left>>right; } //输入初始迭代点函数 void fuction::getpoint() { cout<<"输入迭代初始点:"<<endl; cin>>point; } //计算函数值 double fuction::f(double p) { return (p*p*p+4*p*p-10); } //计算导数值 double fuction::daoshu(double p) { return (3*p*p+8*p); }