Average of Integers #3

Write a program that reads integers from the standard input and computes their average.

Input Specification

Each of the input lines contains an integer. The reading should continue until the scanned value is 0. Do not take into account this 0 value (denoting the end of the input) when calculating the average.

Output Specification

The program should write a single line to the standard output containing the average of the n numbers with a precision of two decimal places.

Sample Input

1. -2
2. -1
3. 1
4. 2
5. 0

Output for Sample Input

1. 0.00