using System;
using static System.Math;
using static System.Console;
using System.Collections;
using System.Collections.Generic;
class main{
static int Main(string[] args){
	double a=0,y0=0,y1=1,b=10;
	foreach(string s in args){
		string[] ws=s.Split('=');
		if(ws[0]=="a") a=double.Parse(ws[1]);
		if(ws[0]=="y0") y0=double.Parse(ws[1]);
		if(ws[0]=="y1") y1=double.Parse(ws[1]);
		if(ws[0]=="b") b=double.Parse(ws[1]);
		}
/*
	Func<double,vector,vector> sincos=delegate(double x, vector y){
		return new vector(y[1],-y[0]);
	};
*/
	Func<double,vector,vector> sincos=(x,y)=>new vector(y[1],-y[0]);
	vector ya=new vector(y0,y1);
	List<double> xs=new List<double>();
	List<vector> ys=new List<vector>();
	ode.rk23(sincos,a,ya,b,xlist:xs,ylist:ys);
	for(int i=0;i<xs.Count;i++)
		WriteLine($"{xs[i]} {ys[i][0]} {ys[i][1]}");
return 0;
}
}