public class HelloWorld{
public static void main(String[] args) {
int one = 10 ;
int two = 20 ;
int three = 0 ;
three=one+two==>30;
three+=one==>40;
three-=one==>30;
three*=one==>300;
three/=one==>30;
three%=one==>0;
任务就是让你把白框里的东西 输出显示