using System;
using static System.Console;
using static System.Math;

class main{

static Func<double,vector,vector>
F=delegate(double x, vector y){
	return new vector(y[1],-y[0]);
		};

public static void Main(){
	double a=0,b=2*PI;
	vector ya=new vector(0.0,1.0);
	var xs=new genlist<double>();
	var ys=new genlist<vector>();
	double h=0.01,acc=1e-2,eps=1e-2;
	ode.driver(F,a,ya,b,acc,eps,h,xs,ys);
	for(int i=0;i<xs.size;i++)
		WriteLine($"{xs[i]} {ys[i][0]} {ys[i][1]}");
	}

}