class LianXi{
 public static void main(String [] args){
  int x = 3;
  int y = 4;
  System.out.println(x+y);
  System.out.println(x-y);
  System.out.println(x*y);
  System.out.println(x/y); //整數(shù)相除只能得到整數(shù)
  System.out.println(x*1.0/y);
  System.out.println(x%y);    //得到的是余數(shù)
  int z =x++;        //先參加運(yùn)算，后自增
  int v =y--;
  System.out.println("x="+x);
  System.out.println("y="+y);
  System.out.println("z="+z);
  System.out.println("v="+v);
 }
}