java - 创建一个计数到给定数字的数组

Question

我需要帮助来创建一个计数到给定数字的数组。输出应如下所示:

Enter a positive integer: 8
Counting up: 1 2 3 4 5 6 7 8
Counting down: 8 7 6 5 4 3 2 1
The first 8 multiples of 5: 5 10 15 20 25 30 35 40
The first 8 multiples of 10: 10 20 30 40 50 60 70 80

这是我目前所拥有的:

Scanner input = new Scanner(System.in);

    int[] myList = new int[1];

    System.out.print("Enter a positive integer: ");
    promptUser(myList);

    int[] testArray = { 1, 1, 2, 3, 5, 8, 13 };
    System.out.print("Test array: ");
    printArray(testArray);

    System.out.print("Counting up: ");
    int[] countingUp = countUp(n);
    printArray(countingUp);
}

public static void promptUser(int[] a){
    Scanner input = new Scanner(System.in);
    for(int i=0; i<a.length; i++){
        a[i] = input.nextInt();

    }
}

public static void printArray(int[] array){
    for(int i=0; i<array.length; i++)
        System.out.print(array[i]);

    }

public static int[] countUp(int n){
    for(int i=0; i<n; i++){
        int count = 0;
        while(count<n){
            count++;
        }
    }
}
}

除了最后一个名为 countingUp 的方法外，一切似乎都正常。

非常感谢!

Answer 1

   public static int[] countUp(int n){
        for(int i=0; i<n; i++){
            int count = 0;
            while(count<n){
                count++;
            }
        }
    }

change this to

public static int[] countUp(int n){
        int [] temp=new int[n];
        for(int i=0; i<n; i++){
         temp[i]=i+1;
        }
     return temp;
    }



System.out.print("Counting up: ");
    int[] countingUp = countUp(n);
    printArray(countingUp);

In this line change to

 int[] countingUp = countUp(n);
 for(int i=0;i<countingUp.length;i++){
   system.out.println(countingUp[i]+" ");
}