二维数组数学序列 (Java)

Question

所以我必须打印出一个数组：

第一个单元格定义方形数组的维度。所以，我有 input Scanner.
在数组的第一行，每个单元格都必须是前一个单元格的三倍减一。
对于接下来的每一行，每个单元格都必须是上一行同一列的两倍加上列数。
例如：如果维度的输入是 4，如 showArrray(creerArray(4));，那么它应该打印如下内容：

    4 11 32 95
    
    8 23 66 193
    
    16 47 134 389

    32 95 270 781

我已经对输入维度的部分进行了编码，但我一直在尝试弄清楚如何对这个序列进行编码：

public static void showArray() {
    
}
 
public static void  createArray() {
    int square= 0;
    int[][] int2D = new int[square][square];

    java.util.Scanner input = new Scanner(System.in);
    square= input.nextInt();
    System.out.println("Enter the dimension of the array:" + square);
    int counter=0;
    for(int i=0; i<square; i++) {
        for(int j=0; j<square; j++){
            int2D[i][j]=counter;
            counter++;
        }
        input.close();
        
    }
    ****i have to start coding the sequence here
        
}

Answer 1

Java please read here 中的数组大小一旦创建就无法更改。我建议你在创建数组之前先询问用户

    Scanner input = new Scanner(System.in);
    System.out.print("Enter the dimension of the array:"); // ask user
    int square= input.nextInt();  //accept user input here
    int[][] int2D = new int[square][square];  //and then create the array

编辑：您不能将“square”变量放入打印中，因为它尚未创建

Answer 2

这完全取决于您将计算放在 for 循环中的什么位置以生成二维数组，例如：

// Get Array size from User...
Scanner userInput = new Scanner(System.in);

int aryLength = 0; // To hold the square 2D Array Rows and Columns length.
while (aryLength == 0) {
    System.out.print("Enter 2D Array square size: --> ");
    String len = userInput.nextLine();
    /* Is the supplied value valid...
       The Regular Expression passed to the String#matches() method
       will return boolean true is the variable len only contains
       a string representation of a signed or unsigned integer 
       value.        */ 
    if (len.matches("-?\d+")) {
        // Yes it is:  
        aryLength = Integer.valueOf(len);
    }
    else {
        System.err.println("Invalid numerical value (" + len + ") supplied!");
        System.err.println(); 
    }
}

// Declare and initialize the 2D Array
int[][] array = new int[aryLength][aryLength];

int startVal = aryLength; // Used to calculate the first cell of every array Row
// Iterate array Rows...
for (int i = 0; i < array.length; i++) {
    // Iterate Columns of each array row...
    int cellVal = startVal; // Used for the cell values for all columns in each row
    for (int j = 0; j < aryLength; j++) {
        array[i][j] = cellVal;
        cellVal = ((array[i][j] * 3) - 1); // calculate cell value
    }
    startVal = startVal * 2; // Calculate first cell value for very row.
}

// Display the 2D Array
System.out.println();
for (int i = 0; i < array.length; i++) {
    System.out.println(Arrays.toString(array[i]).replaceAll("[\[\]]", ""));
}

二维数组数学序列 (Java)

2d array mathematical sequence (Java)

java

arrays

sequence