查找具有不同字符类型的最小值、最大值和平均值

Question

我成功地在我的代码中找到了最小值、最大值和平均值。像这样的代码：

import java.util.Scanner;

public class Tugas {

public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    int max = Integer.MIN_VALUE; 
    int min = Integer.MAX_VALUE; 

    int    count       = 0;     
    double countTotal = 0;

    //... Buat Perulangannya
    System.out.print("Enter values (separate by space) : ");

    while (input.hasNextDouble() ) { 
        //... Get the next value.
        double value = input.nextDouble();

        //... Compare this value to max and min. Replace if needed.
        if (value > max) {
            max = (int) value;
        }
        if (value < min) {
            min = (int) value;
        }

        //... Keep track of these values for average calculation.
        count++;                 // Count the number of data points.
        countTotal += value;   // Keep a running total.
    }

    //... Be sure user entered at least one data point.
    if (count > 0) {                                          //Note 2
        //... Display statistics
        double rata = countTotal / count;

        System.out.println("Min = "  + min);
        System.out.println("Max = "  + max);
        System.out.println("Average = "  + rata);
    } else {
        System.out.println("No Data...!");
    }
}

}

ok，如果我正在输入： 输入值：1 2 3 4 5， 输出为：min 1，max= 5，average = 3.0

问题是，当我按下“输入”时，我的代码不会自动计数。

当我输入时如何输入：a b 8 9 7 c d 它会一直循环直到得到正确的输入

所以： 输入值：a b 8 9 7 c d 它打印“请输入数字类型” 输入值：6 2 4 6 7 2 3 5 3 分钟：2 最大：7 平均：4.2222

谢谢

Answer 1

这里有一个小的修改，它接受来自扫描器的整行，然后解析它。它会根据您的规范在解析时验证该行，如果输入无效则循环。

您确定要将 min 和 max 强制转换为 int 类型吗？该应用程序的其余部分似乎处理双打。

导入 java.util.Scanner;

public class Tugas {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int max = Integer.MIN_VALUE;
        int min = Integer.MAX_VALUE;

        int count = 0;
        double countTotal = 0;

        //... Buat Perulangannya
        boolean validinput = false;
        String valueSetLine = null;
        while (!validinput) {
            System.out.print("Enter values (separate by space) : ");
            valueSetLine = input.nextLine();
            if (valueSetLine.matches("^(-|-?\\d*\\.?\\d+(\\s-?\\d*\\.?\\d*)*)$"))  {
                System.out.println("valid string");
                validinput = true;
            } else {
                System.out.println("invalid input");
            }
        }
        String[] doubleStrs = valueSetLine.split("\\s");
        double[] values = new double[doubleStrs.length];
        int i = 0;
        for (String s : doubleStrs) {
            try {
                double d = Double.parseDouble(s);
                values[i] = d;
                i++;
            } catch (NumberFormatException nfe) {
                nfe.printStackTrace();
            }
        }

        for (double value : values) {
            //... Compare this value to max and min. Replace if needed.
            if (value > max) {
                max = (int) value;
            }
            if (value < min) {
                min = (int) value;
            }

            //... Keep track of these values for average calculation.
            count++;                 // Count the number of data points.
            countTotal += value;   // Keep a running total.
        }

        //... Be sure user entered at least one data point.
        if (count > 0) {                                          //Note 2
            //... Display statistics
            double rata = countTotal / count;

            System.out.println("Min = " + min);
            System.out.println("Max = " + max);
            System.out.println("Average = " + rata);
        } else {
            System.out.println("No Data...!");
        }

    }

}