Poj1003- format,小数点后保留

package Poj1003;

import java.util.Scanner;

public class Cici_1003 {

/**

* @param args

*/

public static void main(String[] args) throws Exception{

// TODO Auto-generated method stub

{

Scanner cin= new Scanner(System.in);

float total_closing_balance = 0;

float temp;

for(int i=0;i<12;i++){

temp = cin.nextFloat();

total_closing_balance = total_closing_balance + temp;

}

float average_balance = total_closing_balance/12;

String result = String.format("%.2f", average_balance);

System.out.println("$" + result );

}

}

}