Question

Write a program which creates a 2D array to store decimal values and passes

that array to another function which sets each element of the array to a

random value between 0.0 and 10.0.

Answer 1

public class RandomMatrix {

    public static void populateMatrix(double[][] matrix) {
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[i].length; j++) {
                matrix[i][j] = Math.random() * 10;
            }
        }
    }

    public static void printMatrix(double[][] matrix) {
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[i].length; j++) {
                System.out.print(matrix[i][j] + " ");
            }
            System.out.println();
        }
    }

    public static void main(String[] args) {
        int numRows = 3;
        int numCols = 4;
        double[][] matrix = new double[numRows][numCols];
        populateMatrix(matrix);
        printMatrix(matrix);
    }
}