MultiplicationSign

static void Main()
        {
            float a = float.Parse(Console.ReadLine());
            float b = float.Parse(Console.ReadLine());
            float c = float.Parse(Console.ReadLine());
            char productSign = '-';

            if (a == 0 || b == 0 || c == 0)
            {
                productSign = '0';
            }
            else
            {
                if ((a > 0 && b > 0 && c > 0) || (a < 0 && b < 0 && c > 0) ||
                    (a < 0 && b > 0 && c < 0) || (a > 0 && b < 0 && c < 0))
                {
                    productSign = '+';
                }
            }
            Console.WriteLine(productSign);
        }