Hack # 1 -- Create method that sets all elements in array to n

void setArray(int[] arr, int n) {
    for (int i = 0; i < array.length; i++){
        array[i] = n;
    }
}

int[] array = new int[10];
setArray(array, 10);

for (int i = 0; i < array.length; i++) {
    System.out.println(array[i]);
}

// Should print all 10s when working properly

10
10
10
10
10
10
10
10
10
10

Hack # 2 -- Write an array to find the average of an array

//Finds the average of an array
public static int average(int[] array) {
    int sum = 0;
    int total = 0;
    for (int i = 0; i < array.length; i++){
        sum += array[i];
        total += 1;
    }
    int average = sum/total;
    return average;
}

//tester array
int[] test = {3, 5, 7, 2, 10};

//returns 10
System.out.println(average(test));

5

Hack #3 -- Find the average number of a diagonal in a 2d array

public static int averageDiagonal (int[][] array2D) {
    // your code here
    int sum = 0;
    int total = 0;
    for (int i = 0; i < arr.length; i++) {
        for (int j = 0; j < arr[i].length; j++) {
            if (i == j) {
                sum += arr[i][j];
                total++;
            }
        }
    }
    int avg = sum/total;
    return avg;
}

int[][] arr = {
    {1,2,3,4,5,6},
    {7,8,9,10,11,12},
    {0,1,2,3,4,5},
    {10,11,12,13,14,15},
    {15,16,17,18,19,20}
};

System.out.println(averageDiagonal(arr));

8

public class Position {
    private int row;
    private int col;
    
    public Position(int r, int c){
        row = r;
        col = c;
    } 
    
    public int getRow() {
        return row;
    }
    
    public int getCol() {
        return col;
    }
    
    public static Position findPosition(int num, int[][] intArr){
        for (int r = 0; r < intArr.length; r++){
            for (int c = 0; c < intArr[0].length; c++){
                if (intArr[r][c] == num) {
                    return new Position(r, c);
                }
            }
        }
        return null;
    }
    
    public static void main(String[] args) {
        int[][] arr = {
            {15,5,9,10},
            {12,16,11,6},
            {14,8,13,7}
        };
        Position pos = Position.findPosition(11, arr);
        System.out.println("Row: " + pos.getRow() + ", Col: " + pos.getCol());
    }
}

Position.main(null);

Row: 1, Col: 2