ex3

import java.util.Scanner;
public class ex3 {

public static void main(String[] args) {
Scanner input = new Scanner(System.in);

//while 语句
String yqy = "";
while (!"hello".equals (yqy)){
System.out.print("请输入一串字符：");
yqy=input.next();
System.out.println("您输入的字符是："+yqy);
}
System.out.println("输入结束！");

//do-while 语句
String yaya;
do{
System.out.print("请输入一串字符：");
yaya=input.next();
System.out.println("您输入的字符是："+yaya);
}while  (!"shikelang".equals (yaya));
System.out.println("输入结束！");

//switch 语句
System.out.print("请输入您的成绩：");
int www;
www= input.nextInt();
switch (www/10){
case 10:
System.out.println("A级");
break;
case 9:
System.out.println("A级");
break;
case 8:
System.out.println("B级");
break;
case 7:
System.out.println("C级");
break;
case 6:
System.out.println("D级");
break;
default :
System.out.println("E级");
break;
}
}
}