public static void main(String[] args) {
        int arrC[][] = new int[3][3];
        int arrD[][] = new int[3][3];
        int sum[][] = new int[3][3];
        int mult[][] = new int[3][3];

        System.out.println("матрица C");
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 3; j++) {
                arrC[i][j] = (int) (Math.random() * 100);
                System.out.print(arrC[i][j] + "\t ");
            }
            System.out.println();

        }

        System.out.println("матрица D");

        for (int k = 0; k < 3; k++) {
            for (int l = 0; l < 3; l++) {
                arrD[k][l] = (int) (Math.random() * 100);
                System.out.print(arrD[k][l] + "\t ");
            }
            System.out.println();

        }
        System.out.println("Сумма матриц");
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 3; j++) {
                sum[i][j] = arrC[i][j] + arrD[i][j];
                System.out.print(sum[i][j] + "\t");
            }
            System.out.println();

        }
        System.out.println("Умножение матриц");
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 3; j++) {
                int t = 0;
                for (int k = 0; k < 3; k++) {
                    t = t + arrC[i][k] * arrD[k][j];
                }
                mult[i][j] = t;
                System.out.print(mult[i][j] + " \t");
            }
            System.out.println();
        }

    }

}