poj日记（1004）

import java.util.Scanner;/** * Created by mxcsky on 2015/1/25. */public class POJ1004 {    public static void main(String[] args){        Scanner in = new Scanner(System.in);        double sum = 0.0;        for (int i = 0; i < 12; i++){            sum = sum + in.nextDouble();        }        System.out.printf("$%.2f", sum/12);    }}