pku1004

java 代码

import java.io.*;
import java.util.*;
import java.text.*;

public class Pku1004 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner cin = new Scanner(new BufferedInputStream(System.in));
        double output = 0;
        int i = 0;
        DecimalFormat f= new DecimalFormat("#.00");
        while(cin.hasNext()&&i<12)
        {
            output += cin.nextDouble();
            i++;
        }

        System.out.println('$'+f.format(output/i));
    }

}