如何在用户输入的数组中找到最小的元素？ 为什么最小元素显示为零？

Question

The code displays the sum, average, and largest element. It doesn't display the smallest element as the output is always zero. How do I display the smallest element in the array?

import java.util.Scanner;
public class Average {

    public static void main (String[] args) {
        
        Scanner input = new Scanner(System.in);
        
        System.out.println("Enter the number of elements:");
        int length = input.nextInt();
        
        int[] num = new int[length];
        System.out.println("Enter the "+ length +  " array elements:");
        int sum = 0;
         int large,small;
         large =small = num[0]; 
         
         for (int i=0; i<length;i++) {
            num[i] = input.nextInt();
            sum = sum+ num[i];
              }
         
        for (int i=0; i<length; ++i) {
            if (num[i]<small) {
                 small = num[i];
            }
              
             if(num[i]> large) {
                 large = num[i];
            }
             }
        
        double avg = sum/length;
        System.out.println("The sum is "+ sum);
        System.out.println("The average is "+ avg);
        System.out.println("The smallest element is "+ small);
        System.out.println("The largest element is "+ large);
        }
}

Answer 1

Yea, it's happening because by default your field small is equal to 0.

And now let's look step by step your if statement

        if (num[i]<small) {
             small = num[i];
        }

example for numbers: 22,11,6,

So first step is num[0] < 0, why 0 as mention before small = 0 by default
Step two num[1] < 0, small stills stay 0
Step Three num[2] < 0, small stills stay 0.

What are you missing, you need to assign value to small at the first iteration of your for loop, for example:

       for (int i=0; i<length; ++i) {
            if(i == 0){
                small = num[i];
            }
            if (num[i]<small) {
                small = num[i];
            }

            if(num[i]> large) {
                large = num[i];
            }
        }

Now your program should work :)

Answer 2

import java.util.Scanner; class Average { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("Enter the number of elements:"); int length = input.nextInt(); int[] num = new int[length]; System.out.println("Enter the " + length + " array elements:"); int sum = 0; int large, small; for (int i = 0; i < length; i++) { num[i] = input.nextInt(); sum = sum + num[i]; } large = small = num[0]; // small should be assigned after num is input for (int i = 0; i < length; ++i) { if (num[i] < small) { small = num[i]; } if (num[i] > large) { large = num[i]; } } double avg = sum / length; System.out.println("The sum is " + sum); System.out.println("The average is " + avg); System.out.println("The smallest element is " + small); System.out.println("The largest element is " + large); } }

Answer 3

if you use java 8 or above, you can use the stream method of Arrays. it simplifies work with arrays. for more info

firstly import the Arrays as import java.util.Arrays;

System.out.println("The sum is " + Arrays.stream(num).sum());
System.out.println("The average is " + Arrays.stream(num).average());
System.out.println("The smallest element is " + Arrays.stream(num).min());
System.out.println("The largest element is " + Arrays.stream(num).max());