klavyeden girilen sayıya kadar (for döngüsü)

package elif;

import java.util.Scanner;

public class eliif {

        public static void main(String[] args) {
                // TODO Auto-generated method stub
                Scanner al=new Scanner(System.in);
                int b;
                System.out.print("sayı gir: ");
                b=al.nextInt();
                for(int i=1; i<=b; i++ ){
        for(int a=1; a<i; a++ ){
                    System.out.print(a);
            }
            System.out.println(""); 
    }
         
            

        }}