Karatsuba.java

package karatsuba;
import java.util.Scanner;
public class Karatsuba {
    public static void main(String[] args) {
        String x, y;
        int a, b ,c, d, ac, ad, bc, bd, answer;
        
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter X: ");
        x = sc.nextLine();
        System.out.println("Enter Y: ");
        y = sc.nextLine();
        
        a = Integer.parseInt(x.substring(0, 2));
        b = Integer.parseInt(x.substring(2, 4));
        c = Integer.parseInt(y.substring(0, 2));
        d = Integer.parseInt(y.substring(2, 4)); 
        
        ac = a * c;
        ad = a * d;
        bc = b * c;
        bd = b * d;
        
        answer = ac * 10000;
        answer += ((ad+bc)*100);
        answer += bd;
        
        System.out.println("The answer is: "+answer);
    }
}