/* Please note that the lack of comments in files like this is
   due to the fact that the program was written during class   */



public class sep14
{


public static void main(String[] args)
{  oint x, y, a, b, c;
   x = new oint(3);
   y = new oint(4);

   a = x.add(y);   // System.out.println(a);  // Obj. oriented style
//   a = oint.plus(x,y);	              // Functional style
   
   b = a.add(new oint(5));
   a.changeme(b.val);

//   System.out.println(a.toString() + "  " + b.toString());

// -----------------------------------------

  matrix M1, M2;
  M1 = new matrix(3,4);
  M2 = new matrix(4,4);
  M1.randomize();
  M2.randomize();
  M1.printmatrix();
  M2.printmatrix();
  

}  // end main

} // end class sep 14



class oint
{  public int val;
   public oint(int initval)  { val = initval; }
   
  public String toString()
    { return ("" + val); }

   
  public oint add(oint y)
    { oint z = new oint(val + y.val);
      return z;
    }

  public static oint plus(oint a, oint b)
   { return new oint(a.val + b.val); }
  

  public oint mult(oint y)
    { return new oint(val * y.val); }

  public boolean equal(oint y)
    { return (val == y.val); }

  public boolean lessthan(oint y)
    { return (val <= y.val); }

  public void changeme(int newval)
    { val = newval; }
}  // end class oint



class matrix
{ int[][] M;
  public matrix(int rows, int cols)
    { M = new int[rows][cols]; }

  public void randomize()
    {  int i, j;

// these next two commands determines the dimensions of the matrix:
// M is a one-dimensional array whose elements are also arrays
// so its length will be the number of rows.  M[0], M[1], etc, are
// themselves one-dimensional arrays, so taking the length of any of 
// them will determine the number of columns.
       int rows = M.length;  
       int cols = M[0].length;

       for(i=0;i<rows;i++)
	 for(j=0;j<cols;j++)
	    M[i][j] = (int) (Math.random() * 5);       
    } // end randomize

  public void printmatrix()
    {  int i, j;
       int rows = M.length;
       int cols = M[0].length;

       for(i=0;i<rows;i++)
        {
	 for(j=0;j<cols;j++)
	    { System.out.print(M[i][j] + " "); }
         System.out.println("");  // carriage return
        }
       System.out.print("\n");  // also CR
    }  // end printmatrix

} // end class matrix