[英]How to find the smallest element in an user inputted array? Why the smallest element is displayed zero?
该代码显示总和、平均值和最大元素。 它不显示最小元素,因为输出始终为零。 如何显示数组中的最小元素?
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);
}
}
是的,这是因为默认情况下您的字段 small 等于 0。
现在让我们一步一步地看看你的 if 语句
if (num[i]<small) {
small = num[i];
}
数字示例: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.
您缺少什么,您需要在 for 循环的第一次迭代中将值分配给 small,例如:
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];
}
}
现在你的程序应该可以工作了:)
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); } }
如果你使用java 8或更高版本,你可以使用Arrays的stream方法。 它简化了数组的工作。 欲了解更多信息
首先将数组import java.util.Arrays;
为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());
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