扫描10个数，存入数组，然后反转数组

Question

我应该在 java 中编写一个程序，扫描 10 个双精度数字，然后将它们存储在一个数组中。然后应该将数字反转并打印出来。这就是我写的。程序以正确的顺序打印数组而不是颠倒顺序，我该如何解决？

public class ReverseNumbers {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        // Fyll i egen kod

        double[] a = new double[10];


        for(int i = a.length - 1; i >=0; i--){
              a[i] = scan.nextDouble();

            System.out.print(" " + a[i]);
        }
    }
}

Answer 1

作为初学者，我不懂 Java 语言，但我可以使用 Qbasic 轻松解决您的问题。

CLS
N = 1
DO
    INPUT "ENTER THE NUMBER"; A(N)
    N = N + 1
LOOP WHILE N <= 10
CLS
DO
    PRINT A(N)
    N = N - 1
LOOP WHILE N > 0
END

Answer 2

您需要使用 Arrays.toString 或其他循环来打印数组。

import java.util.Arrays;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        double[] a = new double[10];
        System.out.println("Enter " + a.length + " numbers: ");
        for (int i = a.length - 1; i >= 0; i--) {
            a[i] = scan.nextDouble();
        }

        // Either print it like this
        System.out.println(Arrays.toString(a));

        // Or like this
        for (double d : a) {
            System.out.print(d + " ");
        }

        System.out.println();

        // Or like this
        for (int i = 0; i < a.length; i++) {
            System.out.print(a[i] + " ");
        }
    }
}

样本运行:

Enter 10 numbers: 
10 20 30 5 15 25 12 22 32 42
[42.0, 32.0, 22.0, 12.0, 25.0, 15.0, 5.0, 30.0, 20.0, 10.0]
42.0 32.0 22.0 12.0 25.0 15.0 5.0 30.0 20.0 10.0 
42.0 32.0 22.0 12.0 25.0 15.0 5.0 30.0 20.0 10.0

Answer 3

这行代码有效:)，谢谢大家！

public class ReverseNumbers {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        // Fyll i egen kod

        double[] a = new double[10];


        for(int i=0; i<10; i++){
            a[i] = scan.nextDouble();
        }

        for(int i = a.length - 1; i >=0; i--){


            System.out.print(a[i] + " ");
        }
    }
}

扫描10个数，存入数组，然后反转数组

Scan 10 numbers, store them in an array and then reverse the array

java

arrays

java.util.scanner