为什么我的代码没有打印到stdout？

Question

我正在尝试计算学生成绩的平均值:

import java.util.Scanner;

public class Average

{

    public static void main(String[] args)
    {
        int mark;
        int countTotal = 0;  // to count the number of entered marks
        int avg = 0;        // to calculate the total average
        Scanner Scan = new Scanner(System.in);

        System.out.print("Enter your marks: ");
        String Name = Scan.next();

        while (Scan.hasNextInt())
        {
            mark = Scan.nextInt();
            countTotal++;

            avg = avg + ((mark - avg) / countTotal);
        }


        System.out.print( Name + "  " + avg );
    } 
}

Answer 1

这是一个使用两个的解决方案Scanner(如我之前的回答所示).

• Scanner stdin = new Scanner(System.in); 扫描用户的输入
• Scanner scores = new Scanner(stdin.nextLine()); 扫描包含分数的行

另请注意,它使用更简单,更易读的公式来计算平均值.

        Scanner stdin = new Scanner(System.in);

        System.out.print("Enter your average: ");
        String name = stdin.next();

        int count = 0;
        int sum = 0;
        Scanner scores = new Scanner(stdin.nextLine());
        while (scores.hasNextInt()) {
            sum += scores.nextInt();
            count++;
        }
        double avg = 1D * sum / count;
        System.out.print(name + "  " + avg);

样本输出:

Enter your average: Joe 1 2 3
Joe  2.0