猜数字问题

import java.util.Scanner;


//猜数字
public class Title6 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		System.out.println("请想好 1-100 之间的一个数字！");
		System.out.println("告诉我猜的结果：....");
		f();
	}
	

	public static void f(){
		Scanner scan = new Scanner(System.in);
		int v1 = 1;
		int v2 = 100;
		for(;;)
		{
			int m = (v1 + v2)/2;
			System.out.println("我猜是：" + m);
			System.out.println("1.猜得太大了");
			System.out.println("2.猜得太小了");
			System.out.println("3.猜中！");
			System.out.print("请选择：");
			int user = Integer.parseInt(scan.nextLine());
			if(user==3) break;
			if(user==1) v2--;
			if(user==2) v1++;
		}

	}

}