具有从 Scanner 存储的数字的字符串的平均值

Question

我是编码新手，我的任务是从使用扫描仪的用户那里获取三个月的平均降雨量（11 月、12 月、1 月），然后平均三个月的降雨量。

我显然做错了什么，因为我已经将平均值初始化为一个字符串，但不知道如何初始化变量？基本上我不知道如何将用户输入的降雨结果转换为整数，如果有人可以帮助我编写代码以及如何正确平均三个月，那就太好了，谢谢！

import java.util.Scanner;
public class rainfall {

  public static void main (String[] args) {
    Scanner stdin = new Scanner (System.in);

    String November, December, January;

    String average;

    System.out.println("what is the rainfall for November?");
    November = stdin.nextLine();

    System.out.println("what is the rainfall for December?");
    December = stdin.nextLine();

    System.out.println("what is the rainfall for January?");
    January = stdin.nextLine();

    System.out.println("the rainfall for November is: \t "  + November );
    System.out.println("the rainfall for December is: \t "  + December );
    System.out.println("the rainfall for January is: \t "  + January );

    average = November + December + January/3;
    System.out.println("The average is " + average );
  }
}

Answer 1

试试这个可以解决你的问题

 public static void main (String[] args) {
        Scanner stdin = new Scanner (System.in);

        double November, December, January;

        double average;

        System.out.println("what is the rainfall for November?");
        November = stdin.nextDouble();

        System.out.println("what is the rainfall for December?");
        December = stdin.nextDouble();

        System.out.println("what is the rainfall for January?");
        January = stdin.nextDouble();

        System.out.println("the rainfall for November is: \t "  + November );
        System.out.println("the rainfall for December is: \t "  + December );
        System.out.println("the rainfall for January is: \t "  + January );

        average = (November + December + January)/3;
        System.out.println("The average is " + average );
      }