package exercise.pkg7.pkg1;
import java.util.*;

public class Exercise71 {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int[][] m = new int[4][4];
        System.out.println("Enter a 4-by-4 matrix row by row: ");
        for (int i=0; i<4; i++)
        {
            for(int j=0;j<4;j++)
            {
                m[i][j] = input.nextInt();
            }
        }

        System.out.println("The sum if the matrix is " + sumMatrix(m));
    }

    public static double sumMatrix(int[][] m) {
        int total = 0;
        int row = 0;
        int column = 0;

        for (row = 0; row < 4; row++){
            for (column = 0; column < 4; column++){
                total += m[row][column];
            }
        }

        return total;
    }
}