POJ系列——java

import java.text.DecimalFormat;
import java.util.Scanner;

/**
* Created by admin on 2017/10/25.
*/
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();
}
sum = sum/12;
DecimalFormat df = new DecimalFormat(".00");//小数2位
String string = df.format(sum);
System.out.println("$"+string);
}

}