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++)
    {
        arr[i] = n;
    }
}


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

for (int i = 0; i<array.length; i++) {
    System.out.print(array[i]);
    if(i != 9){
        System.out.print(",");
    }
}

10,10,10,10,10,10,10,10,10,10

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

public static int average(int[] array) {
    // put your code here
    int sum = 0;
    int avg = 0;
    for (int n: array){
        sum += n;
    }
    avg = sum / array.length;
    return avg;
}

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


//returns 10
System.out.println("Average of array = " + average(test));

Average of array = 5

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

public static int averageDiagonal (int[][] array2D) {
    // your code here
    int sum = 0;
    for (int r = 0; r < array2D.length; r++){
        for (int c = 0; c < array2D[r].length; c++){
            if (r == c){
                sum += array2D[r][c];
            }
        }
    }
    return sum / array2D.length;
}

int[][] arr = {
    {1,2,3,4,5,6},
    {7,8,9,10,11,12},
    {13,14,15,16,17,18},
    {19,20,21,22,23,24},
    {25,26,27,28,29,30}
};

System.out.println("Average of diagonal = "+averageDiagonal(arr));

Average of diagonal = 15