简单的写一下

解题思路:

注意事项:

参考代码: 

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

             int t = sc.nextInt();

             if(25<=t && t<=30){

                 System.out.printf("ok!");

             }

             else{

                 System.out.printf("no!");

             }

    }

}