FRQ 4

/** Constructs a LightBoard object having numRows rows and numCols columns.
* Precondition: numRows > 0, numCols > 0
* Postcondition: each light has a 40% probability of being set to on.
*/

public class LightBoard { 
    private boolean[][] lights; 

public LightBoard(int numRows, int numCols) 
 {
    lights = new boolean[numRows][numCols];

    for (int r = 0; r < numRows; r++)
    {
        for (int c = 0; c < numCols; c++) {
            if(Math.random() < 0.4) {
                lights[r][c] = true;
            }
            else {
                lights[r][c] = false;
            }
        }
    }

 }


/** Evaluates a light in row index row and column index col and returns a status
* as described in part (b).
* Precondition: row and col are valid indexes in lights.
*/

public boolean evaluateLight(int row, int col) {
    int count = 0;
    for (int r = 0; r > lights.length; r++) {
        if (lights[r][col]) 
        {
            count++;       
        }
    }

    if (lights[row][col] && count % 2 == 0) {
        return false;
    }

    if (!lights[row][col] && count % 3 == 0) {
        return true;
    }
        return lights[row][col];

}
}

LightBoard lightboard = new LightBoard(7,5);
System.out.println(lightboard.evaluateLight(0,0));
System.out.println(lightboard.evaluateLight(2,1));
System.out.println(lightboard.evaluateLight(5,3));

true
true
false