java 面试每日一题3

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;

public class testThree {
    public static void main(String[] args) throws IOException{
        System.out.println("请输入a的值");
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        int a=Integer.parseInt(br.readLine());
        System.out.println("请输入b个数：");
        BufferedReader buf=new BufferedReader(new InputStreamReader(System.in));
        int b=Integer.parseInt(br.readLine());
        /*Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();*/
        System.out.println("请输入b的值");
//        int b = sc.nextInt();
        int s=count_value(b,a);
        System.out.println(s);
    }

private static int count_value(int i,int a){
    if (i <= 0) {
    return 0;
    } else {
    return a * i + count_value(i - 1,a) * 10;
    }
    }
}