AP CSA 2022 Q4 - Data Class


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Solution of Q4 (Data) - Free Response Question - 2022


The original question can be found at: https://apcentral.collegeboard.org/media/pdf/ap22-frq-computer-science-a.pdf


Part (a)- public void repopulate() 


        public void repopulate()
    {
        int rand=0;
        grid = new int [3][3];
        for (int i=0; i< grid.length; i++) {
            for (int j=0; j < grid[0].length; j++)
            {
                rand= (int)(Math.random() * MAX );
                
                while (!(rand%10 == 0) || (rand %100 ==0))
                {
                    rand= (int) (Math.random() * MAX);
                }
                grid[i][j] = rand;
                
            }
        }
    }

Part (b)- public int countIncreasingCols() 


    public int countIncreasingCols()
    {
        int count=0;
        boolean order =false;
        for (int col=0; col< grid[0].length; col++) {
            order = true;
            for (int row=1; row < grid.length; row++)
            {
                if (grid[row][col] < grid[row-1][col]) order =false;
                
            }
            if (order == true) count ++;
        }
        
        return count;
    }


Java project files (with Runner code):


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