newton迭代法.cpp

使用C++编写的经典数值计算算法,包括NEWTON迭带法,SIMPSON,二分法,二分法求根,还附加了模式识别的FISHER算法

#include<iostream.h>
#include<math.h>
double f(double x)
{
	double y=x-exp(-x);
    return y;
}
double d(double x)
{
	double y=1+exp(-x);
	return y;
}
void g(double x0,double x1,double e)
{
	x1=x0-f(x0)/d(x0);
	cout<<x1<<" ";
	if(fabs(x1-x0)>=e)
	{
		x0=x1;
		g(x0,x1,e);
	}
	else cout<<'\n'<<"方程根为："<<x1;
}
void main()
{
	double x0,x1,e;
	cout<<"输入初始近似值：";
	cin>>x0;
	cout<<"输入误差限：";
	cin>>e;
	g(x0,x1,e);
}