改进的欧拉方法.cpp

我这是割线法和改进的欧拉法的源代码

#include<iostream.h>
double y(double x,double y)
{
	return -x*y*y;

}
double func(int n)
{
	double Yp=0;
	double x0=0;
	double Yc=0;
	double Yn=2;
	double Y=0;
	double c=5.0/n;
	double x1=0;

	for(int i=0;i<n;i++)
	{
		x1=x1+c;
		Yp=Yn+c*y(x1,Yn);
		Yc=Yn+c*y(x1,Yp);
		Y=(Yp+Yc)/2;
		Yn=Y;

	}
return Y;
}
void main()
{
	int n=0;
	cout<<"请输入你要等分数"<<endl;
	cin>>n;
	cout<<n<<endl;
	cout<<func(n);
}