Poj Solution 1269

http://poj.org/problem?id=1269

//* @author popop0p0popo
import java.util.*;
import java.io.*;

public class Main{
    public static void main(String[] args){
        Scanner scanner=new Scanner(new BufferedReader(new InputStreamReader(System.in)));
        int n=scanner.nextInt();
        double[] x,y;
        double px,py;
        double k1,k2,b1,b2;
        System.out.println("INTERSECTING LINES OUTPUT");
        for (int i=0;i< n ;i++ ){
            x=new double[4];
            y=new double[4];
            for (int j=0;j< 4 ;j++ ){
                x[j]=scanner.nextDouble();
                y[j]=scanner.nextDouble();
            }
            if ((x[1]-x[0])*(y[3]-y[2])==(x[3]-x[2])*(y[1]-y[0])){
                if ((x[3]-x[0])*(y[2]-y[1])==(x[2]-x[1])*(y[3]-y[0])){
                    System.out.println("LINE");
                }
                else{
                    System.out.println("NONE");
                }
            }
            else{
                if (x[0]==x[1]){
                    px=x[0];
                    k2=(y[3]-y[2])/(x[3]-x[2]);
                    b2=y[3]-k2*x[3];
                    py=k2*px+b2;
                }
                else if (x[2]==x[3]){
                    px=x[2];
                    k1=(y[1]-y[0])/(x[1]-x[0]);
                    b1=y[1]-k1*x[1];
                    py=k1*px+b1;
                }
                else{
                    k1=(y[1]-y[0])/(x[1]-x[0]);
                    b1=y[1]-k1*x[1];
                    k2=(y[3]-y[2])/(x[3]-x[2]);
                    b2=y[3]-k2*x[3];
                    px=(b2-b1)/(k1-k2);
                    py=k1*px+b1;
                }
                px=(Math.round(px*100.0))/100.0;
                py=(Math.round(py*100.0))/100.0;
                System.out.println("POINT "+getO(px)+" "+getO(py));
            }
        }
        System.out.println("END OF OUTPUT");
    }

    public static String getO(double d){
        String ds=""+d;
        while (true){
            int index=0;
            boolean flag=false;
            for (int j=0;j< ds.length() ;j++ ){
                if (flag){
                    index++;
                }
                if (ds.charAt(j)=='.'){
                    flag=true;
                }
            }
            if (index==2){
                break;
            }
            else if (index==1){
                ds=ds+"0";
            }
        }
        return ds;
    }
}