用户输入计算平均值

时间:2012-06-04 19:58:31

标签: java average

我正在编写一个程序来计算用户输入的平均值。

import java.util.Scanner;
public class mean
{   
    static Scanner input = new Scanner (System.in);
    public static void main (String[] args)
    {
    double i;
    double sum = 0;
    int count = 0;
    do
    {
        System.out.println("input");
        i = input.nextDouble();
        sum = sum + i;
        count++;
    }while (i != 0);
    System.out.println("sum is " + sum + " count is " + (count - 1));
    System.out.println("average is " + sum / (count - 1));
}
}

如果我输入0,它将计算。但如果列表中有0。有人可以指导我很好的条件吗?

2 个答案:

答案 0 :(得分:2)

您可以询问扫描仪扫描仪正在读取的下一个令牌是否为双倍,如果不是则会中断。示例如下:

import java.util.Scanner;
public class mean
{   
    static Scanner input = new Scanner (System.in);
    public static void main (String[] args)
    {
    double i;
    double sum = 0;
    int count = 0;
    while(input.hasNextDouble())
    {
        System.out.println("input");
        i = input.nextDouble();
        sum = sum + i;
        count++;
    }
    System.out.println("sum is " + sum + " count is " + (count));
    System.out.println("average is " + sum / (count));
}
}

如果用户输入非数字字符(例如,不是'+',' - ',0-9,'。'等),则循环将中断,因为input.hasNextDouble()将返回false。 / p>

答案 1 :(得分:0)

而不是sum = sum + i更简单的方法是sum += i