2D Arrays Part 2 HW

Part A

public void repopulate() {
    // iterates through each row of the grid
    for (int row = 0; row < grid.length; row++) {
        // iterate through each column of the grid
        for (int col = 0; col < grid[row].length; col++) {
            int value;
            // generates random values until the criteria are met
            do {
                value = (int)(Math.random() * MAX) + 1;  // generates a random number between 1 and MAX (inclusive)
            } while (value % 10 != 0 || value % 100 == 0);  // ensures the value is divisible by 10 but not by 100
            grid[row][col] = value;  // assigns the valid value to the grid
        }
    }
}

Part B

public int countIncreasingCols() {
    int count = 0;  // counter for the number of increasing columns

    // iterate through each column of the grid
    for (int col = 0; col < grid[0].length; col++) {
        boolean isIncreasing = true;  // assume the column is increasing

        // check each row in the current column (starting from the second row)
        for (int row = 1; row < grid.length; row++) {
            if (grid[row][col] < grid[row - 1][col]) {  // if current value is less than the previous value
                isIncreasing = false;  // columns is not increasing
                break;  // exits the loop early as we found a violation
            }
        }

        if (isIncreasing) {
            count++;  // incrementss count if the column is increasing
        }
    }
    return count;  // returns the total number of increasing columns
}