Hack: Create method that sets all elements in array to n

void setArray(int[] arr, int n) {
    // your code here
    for (int i = 0; i < arr.length; i++) // for loop to iterate through the array
    {
        arr[i] = n; // set the value of the array at index i to n
    }
}

int[] array = new int[10];
setArray(array, 10); // set all values in array to 10

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

// Should print all 10s when working properly

10
10
10
10
10
10
10
10
10
10

Hack: Write an array to find the average of an array

//Example finding the max in an array. 

//Finds the maximum in an array
public static int average(int[] array) {
    // put your code here
    int sum = 0; //sum of all elements
    int avg = 0; //average of all elements
    for (int n: array){
        sum += n; //add each element to the sum
    }
    avg = sum / array.length; //divide the sum by the number of elements
    return avg; //return the average
}

//tester array
int[] test = {3, 5, 7, 2, 10}; //average should be 5.4

//returns 10
System.out.println(average(test)); //prints 5

5

Hack: Find the average number of a diagonal in a 2d array

For example, here find the average of the bolded #s
1 2 3 4
5 6 7 8
9 1 2 3

public static int averageDiagonal (int[][] array2D) {
    // your code here
    int sum = 0; // sum of all elements
    for (int r = 0; r < array2D.length; r++){
        for (int c = 0; c < array2D[r].length; c++){
            if (r == c){
                sum += array2D[r][c]; //add each element to the sum
            }
        }
    }
    return sum / array2D.length; //return the average
}

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