不定数组的数据读取

import java.util.Scanner;
class Main {

	public static void main(String[] args) {
int n,a[],c=0;
Scanner in=new Scanner(System.in);

float b=0;
while(in.hasNext())
{n=in.nextInt();a=new int [n];
for(int i=0;i<n;i++)
{a[i]=in.nextInt();
c+=a[i];}
b=c/n;
System.out.printf("%.2f,%d\n",b,c);
c=0;
}
	}

}