Java 循环让我大吃一惊

Question

嗨，我在循环方面遇到了麻烦。我对如何设置获取方法感到困惑

• 最低分

• 最高分

• 分数的平均值

如果未输入分数，则显示消息“未输入测试成绩分数”。

我还必须发送一个计数器(我这样做了)，并且我还必须验证分数是否从 0 到 100(我这样做了)，我只是不知道下一步该做什么

    import java.util.Scanner;

    public class loops {

    public static void main(String[] args) {

        Scanner keyboard = new Scanner(System.in);

        int average = 0;
        int count = 0;
        int score;



        System.out.print("Please enter first score:");
        score = keyboard.nextInt();




        while (score!=-1){

       while ((score>=0)&&(score<=100)){

            System.out.println("the score is between 0 to 100 ");
            System.out.println("Please enter the next test score:");
            score = keyboard.nextInt();
             count = count + 1;

        }


        }


        average = (score/count);
        System.out.println("The average is " +average);
        System.out.println("The number of test scores enter was:"+count);


    }

}

Answer 1

查看评论中的解释:

import java.util.Scanner;

public class Loops { //use java naming convention

    public static void main(String[] args) {

        Scanner keyboard = new Scanner(System.in);

        int  count = 0,  score = 0, min = 0, max = 0, sum =0;
        float average = 0;//the average might not be int

        System.out.print("Please enter first score:");
        score = keyboard.nextInt();

        //add it to sum
        sum = score;
        //keep first number as min and max
        min = score;  max = score;

        count++;//increment counter

        //this is not needed, score of -1 will stop the next loop any way
        //while (score!=-1){

        while (true){

            System.out.println("the score is between 0 to 100 ");
            System.out.println("Please enter the next test score, or -1 to quit:");
            score = keyboard.nextInt();

            if((score < 0) ||(score > 100)) {
                break;
            }
            count++;//increment counter

            //you need to sum all entered numbers
            sum += score;

            //check if entered number is min
            if(score < min) {
                min = score ;
            }

            //check if entered number is max
            if(score >  max) {
                max = score ;
            }
        }

        if(count >0 ) {
            average = ((float)sum/count);
            System.out.println("The average is " +average );
            System.out.println("The min is " +min);
            System.out.println("The max is " +max);
            System.out.println("The number of test scores enter was:"+count);
        }else {
            System.err.println("No numbers entered");
        }
    }
}

如有需要，请随时要求澄清。