Financial Management

3000 ms  |  内存限制： 65535

1

The input will be twelve lines. Each line will contain the closing balance of his bank account for a particular month. Each number will be positive and displayed to the penny. No dollar sign will be included. 

输出 The output will be a single number, the average (mean) of the closing balances for the twelve months. It will be rounded to the nearest penny, preceded immediately by a dollar sign, and followed by the end-of-line. There will be no other spaces or characters in the output. 

样例输入

100.00 489.12 12454.12 1234.10 823.05 109.20 5.27 1542.25 839.18 83.99 1295.01 1.75

样例输出

1581.42

# include<stdio.h>

int main()
{
  double a,sum;
  int i = 12;

  sum = 0;
  
  while(i--)
  {
    scanf("%lf",&a);
    sum = sum + a;
  }
  printf("%.2lf\n",sum/12.0);

  return 0;
}