import java.util.Scanner;
public class Lab1{
    public static void main(String[] args){
        Scanner console = new Scanner(System.in);
        System.out.print("Enter x1: ");
        int x1 = console.nextInt();

        System.out.print("Enter y1: ");
        int y1 = console.nextInt();

        System.out.print("Enter x2: ");
        int x2 = console.nextInt();

        System.out.print("Enter y2: ");
        int y2 = console.nextInt();

        console.close();

        System.out.println("The average of 2 and -1 is 0.5.")
    }
    public static double average(int x, int y){
    }

    public static double slope(int x1, int y1, int x2, int y2){
    }

    public static int difference(int x, int y){
    }

    public static int square(int x){
    }

    public static double distance(int x1, int y1, int x2, int y2){
    }
}