//Mike Piff, CICS, University of Sheffield (1997)
public class Cartesian {
	public double x,y,z;
	public Cartesian(double x,double y,double z){
		this.x=x;
		this.y=y;
		this.z=z;
	}
		
	public Cartesian(double x,double y){
		this.x=x;
		this.y=y;
		this.z=0.0d;
	}
	public Cartesian(Cartesian c){
		this.x=c.x;
		this.y=c.y;
		this.z=c.z;
	}
	public Cartesian(){
		this.x=0.0d;
		this.y=0.0d;
		this.z=0.0d;
	}
	
	public Cartesian(Cartesian c1, Cartesian c2, double a,double b){
		double a1=a/(a+b);
		double b1=b/(a+b);
		this.x=(a1*c1.x+b1*c2.x);
		this.y=(a1*c1.y+b1*c2.y);
		this.z=(a1*c1.z+b1*c2.z);
	}

	public String toString(){
		return "("+x+","+y+","+z+")";
	}
}