import java.io.*;
import java.util.*;
import java.lang.Math.*;

public class vector3D
{
    public double x;
    public double y;
    public double z;
        
    public vector3D()
    {
        reset();
    }
        
    public vector3D( double x, double y, double z )
    {
        this.x = x;
        this.y = y;
        this.z = z;
    }
        
    public vector3D( vector3D v )
    {
        x = v.x;
        y = v.y;
        z = v.z;
    }

    public void set( vector3D v )
    {
        x = v.x;
        y = v.y;
        z = v.z;
    }
        
    public void reset()
    {
        x = 0;
        y = 0;
        z = 0;
    }
        
    public void add( double d )
    {
        x += d;
        y += d;
        z += d;
    }
        
    public void add( vector3D v )
    {
        x += v.x;
        y += v.y;
        z += v.z;
    }
        
    public void sub( vector3D v )
    {
        x -= v.x;
        y -= v.y;
        z -= v.z;
    }
        
    public void mul( double d )
    {
        x *= d;
        y *= d;
        z *= d;
    }
        
    public void mul( vector3D v )
    {
        x *= v.x;
        y *= v.y;
        z *= v.z;
    }
        
    public void div( double d )
    {
        x /= d;
        y /= d;
        z /= d;
    }
        
    public void div( vector3D v )
    {
        x /= v.x;
        y /= v.y;
        z /= v.z;
    }
        
    public void pow( double d )
    {
        x = Math.pow( x, d );
        y = Math.pow( y, d );
        z = Math.pow( z, d );
    }
        
    public double length()
    {
        double d = x * x + y * y + z * z;
        return Math.sqrt( d );
    }
        
    public void normalize()
    {
        double d = x * x + y * y + z * z;
        div( Math.sqrt( d ) );
    }
    
    public String toString()
    {
        return( "< " + x + ", " + y + ", " + z + " >" );
    }
}