public class MyTest {
    public static void main(String[] args) {
//        System.out.println("a\ta");
//        System.out.println("123456789");//ctrl+d

        System.out.println("\t\t欢迎使用超市结算系统");
        System.out.print("* * * * * * * * * * * * * * * * * * \n");
        System.out.println("\t\t1.xxxx ");
        System.out.println("\t\t2.xxxx ");
        System.out.println("\t\t3.xxxx ");
        System.out.println("\t\t4.xxxx ");
        System.out.print("* * * * * * * * * * * * * * * * * * \n");

        System.out.println(3 * 0.3f);
    }
}