package application;
import java.util.Scanner;
public class Example001 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("输出一个数:");
int a = input.nextInt();
int b = ((a<0)==true?1:0)+((a<10)==true?1:0)+((a<20)==true?1:0)+((a<30)==true?1:0);
switch(b){
case 0:
System.out.println("a>=30");
break;
case 1:
System.out.println("20<=a<30");
break;
case 2:
System.out.println("10<=a<20");
break;
case 3:
System.out.println("0<=a<10");
break;
case 4:
System.out.println("a<0");
break;
}
}
}