int a = 1;
            int b = 3;
            int c = -4;
            int d = -2;
            int e = -1;

            int[] arr = { a, b, c, d, e };

          //  Console.WriteLine(arr.Length);
            for (int i=0; i<=arr.Length-1; i++)
            {
            if (arr[0] + arr[i+1] == 0)
                {

                    if (arr[i+1] >= arr[arr.Length-1])
                    {
                       // arr[i + 1] = arr[arr.Length - 1];
                        break;
                    }
                    Console.WriteLine("{0} + {1} = 0", arr[0], arr[i + 1]);
                }
            }