import java.io.*;
 
public class matrik {
    //main() : application entry point
    public static void main(String[] args) throws IOException {
 
        // create 2D array of dim and initialised
	int[][] dim = new int[2][2];
	boolean plusminus = false;
        boolean multiple = false;
        
	//notes: dim(0,0) = height matrix A  dim(0,1) = width matrix A
	//       dim(1,0) = height matrix B  dim(1,1) = width matrix B
 
        //set input stream
        BufferedReader stdin = 
            new BufferedReader(new InputStreamReader(System.in));
 
	//MATRIX A
 
	//ask input(height,width and element(s) for Matrix A
        System.out.println("Enter the height of matrix A : ");
        dim[0][0] = Integer.parseInt(stdin.readLine());
        System.out.println("Enter the width of matrix A : ");
        dim[0][1] = Integer.parseInt(stdin.readLine());
 
        //create matrix A || all element(s) is zero
        int[][] A = new int[dim[0][0]][dim[0][1]];
 
 
        //ask for the element(s)
        for (int i=0 ; i < A.length ; i++)
            for  (int j=0 ; j < A[i].length ; j++)
            {
              System.out.println("Enter element A("+(i+1)+","+(j+1)+") : ");
              A[i][j] = Integer.parseInt(stdin.readLine());
            }
 
        //MATRIX B
 
        //ask input(height,width and element(s) for Matrix B
        System.out.println("Enter the height of matrix B : ");
        dim[1][0] = Integer.parseInt(stdin.readLine());
        System.out.println("Enter the width of matrix B : ");
        dim[1][1] = Integer.parseInt(stdin.readLine()) ;
        
        //create matrix B || all element(s) is zero
        int[][] B = new int[dim[1][0]][dim[1][1]];
 
 
        //ask for the element(s)
        for (int i=0 ; i < B.length ; i++)
            for  (int j=0 ; j < B[i].length ; j++)
            {
              System.out.println("Enter element B("+(i+1)+","+(j+1)+") : ");
              B[i][j] = Integer.parseInt(stdin.readLine());
            }
 
        //Check if the matrices can perform addtion and substraction
        if ( dim[0][0] == dim[1][0] && dim[0][1] == dim[1][1] )
           { plusminus = true; }
 
        //Check if the matrices can perform multiplication
        if ( dim[0][1] == dim[1][0] )
           { multiple = true; }
        
        //Addition
        
        if (plusminus == true)
        {
        //create matrix Cplus || all element(s) is zero
        int[][] Cplus = new int[dim[0][0]][dim[0][1]];
        //method to perform addition [(A + B) = Cplus]
          for (int i=0 ; i < Cplus.length ; i++)
           {   for  (int j=0 ; j < Cplus[i].length ; j++)
               Cplus[i][j] = A[i][j] - B[i][j];  }
        }
 
        //Substraction
 
        if (plusminus == true)
        {
        //create matrix Cminus || all element(s) is zero
        int[][] Cminus = new int[dim[0][0]][dim[0][1]];
        //method to perform subtration [(A - B) = Cminus ]
          for (int i=0 ; i < Cminus.length ; i++)
           {   for  (int j=0 ; j < Cminus[i].length ; j++)
               Cminus[i][j] = A[i][j] - B[i][j];  }
        }
 
        //Mulstiplication
        
        if (multiple == true)
        {
        //create matrix Cmutiply || all element(s) is zero
        int[][] Cmultiply = new int[dim[0][0]][dim[1][1]];
        //method to perform multiplication [(A*B) = Cmultilpy]
          for (int i=0 ; i < Cmultiply.length ; i++)
              for (int j=0 ; j < Cmultiply[i].length ; j++)
                  for (int k=0 ; k < dim[0][1] ; k++)
                  {
                    Cmultiply[i][j] = Cmultiply[i][j] + A[i][k]*B[k][j];
                  }
        }
        
        //Printing the results
        
        //Display Matrix A
        //********Here is my problem... ****
        //Problem arise if the element is more than one       digit
        System.out.println("Matrix A");
        for (int i=0 ; i < A.length ; i++)
        {     System.out.println();
            for  (int j=0 ; j < A[i].length ; j++)
                 {System.out.print(A[i][j]+" ");
 
 
                 }
        }
    }
}