using System;

public class Program

{

    public static void Main()

    {

        int[] numbers = new int[5];

        Console.WriteLine("write 5 numbers: some positive, some negative");

​

        for(int i=0;i<numbers.Length;i++){

            int userInput = int.Parse(Console.ReadLine());

            numbers[i]=userInput;

        }

        Console.WriteLine("the positive numbers are:");

        int positive=0;

        int negative=0;

        int sumPositive=0;

        int sumNegative=0;

        int negativeAverage=0;

        int positiveAverage=0;  

        for(int i=0;i<numbers.Length;i++){

            if(numbers[i]>=0){              

            Console.Write(numbers[i]+"\t");

                positive+=1;

                sumPositive+=numbers[i];

            }

​

        }

        Console.WriteLine(" ");

        Console.WriteLine("the negative numbers are:");

        for(int i=0;i<numbers.Length;i++){

            if(numbers[i]<0){               

            Console.Write(numbers[i]+"\t");

                negative+=1;

                sumNegative+=numbers[i];

            }

        if(negative>0){

            negativeAverage = sumNegative/negative;

        }

            else{Console.WriteLine("no negative numbers");}

        positiveAverage = sumPositive/positive;

        }

        Console.WriteLine(" ");

        Console.WriteLine("sum of positive numbers is:"+" "+sumPositive);

        Console.WriteLine("sum of negative numbers is:"+" "+sumNegative);

        Console.WriteLine("the average of positive numbers is:"+" "+positiveAverage);

        Console.WriteLine("the average of negative numbers is:"+" "+negativeAverage);

    }

}

​

//http://practiceexercisescsharp.blogspot.co.il/2013/05/404-array-of-positive-and-negative.html