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); //整数相除只能得到整数
System.out.println(x*1.0/y);
System.out.println(x%y); //得到的是余数
int z =x++; //先参加运算,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);
}
}