java - 当使用扫描仪输入值到数组时找不到最小的数字

Question

使用扫描仪:

import java.util.Scanner;

public class InputArrayFromScanner {

    private static Scanner keyIn;

    public static void main(String[] args) {
        keyIn = new Scanner (System.in);
        System.out.print("Enter a Number: ");
        int inNum = keyIn.nextInt();
        int [] arrNum = new int [inNum];
        int maxNum = arrNum[0];
        int minNum = arrNum[0];
        int  average = 0;
        int total = 0;
        for (int count : arrNum){
            System.out.print ("> ");
            arrNum[count] = keyIn.nextInt();
            if (arrNum[count] > maxNum)
                maxNum = arrNum[count];
            else if (arrNum[count] < minNum)
                minNum = arrNum[count];
            total += arrNum[count];
            average = total/arrNum.length;
        }
        System.out.print("\tBigest Number is:"+maxNum);
        System.out.print("\tSmallest Number is:"+minNum);
        System.out.print("\tPlus of Numbers is:"+total);
        System.out.println("\tAverage Of Numbers is:"+average);


    }

}

不带扫描仪

public class MinAndMax {

    public static void main(String[] args) {
        int [] arrNum = {10,12,80,6,5};
        int minNum = arrNum [0];
        int maxNum = arrNum [0];
        for (int count = 0; count < arrNum.length; count++ ){
            if (arrNum[count] < minNum)
                minNum = arrNum[count];
            else if (arrNum[count] > maxNum)
                maxNum = arrNum[count];
        } 
       System.out.print ("\tSmallest Number is "+minNum);
       System.out.print ("\tBigest Number is "+maxNum);
    }

}

问题是什么？

Answer 1

在第一个代码片段中，您将使用增强的 for 循环迭代数组值:

for (int count : arrNum)

您应该迭代数组索引:

for (int count = 0; count < arrNum.length; count++)