public class HelloWorld{

    public static void main(String[] args) {

    int one = 10 ;

        int two = 20 ;

        //int three = 0 ; 我吧这一行注释了。。

        int three = one + two ;

        //System.out.println(three);

        System.out.println(three +"==>30");

        System.out.println((three += one) + "==>40");

        System.out.println((three -= one) + "==>30");

        System.out.println((three *= one) + "==>300");

        System.out.println((three /= one) + "==>30");

        System.out.println((three %= one) + "==>0");

}

}