Write the code to define and instantiate a 2D array that can store 10 rows of 5 doubles.

What is output by the code below? int[][] bigMat = new int[10][10]; System.out.println(bigMat[5][5]);

What is output by the code below? int[][] greenMat; //instance variable //precondition: greenMat has not been instantiated public void test() { System.out.println(greenMat[0][0]); }