Question

java从键盘输入一个正整数n,输出1+2+3+...+n的和以及平均值

Answer 1

import java.util.Scanner;

public class Evaluation {

public static void main(String[] args) {

System.out.println("请输入一个数：");

Scanner input = new Scanner(System.in);

int num = input.nextInt();

Evaluation a = new Evaluation();

int sum = a._zuoye01(num)/num;

System.out.println("和为："+a._zuoye01(num));

System.out.println("平均值为："+sum);

input.close();

}

public int _zuoye01(int num1) {

if (num1>=2) {

return num1+_zuoye01(num1-1);

}else {

return num1;

}

}

}

追问

那个zuoye01是啥啊大佬