static void Main(string[] args)
        {
            Console.WriteLine("please enter user count : ");
            int userCount = int.Parse(Console.ReadLine());
            string[] namesList = new string[userCount];
            for(int i = 0; i < userCount; i++)
            {
                Console.WriteLine("please enter user fullname" + (i + 1) + " : ");
                string fullName = Console.ReadLine();
                namesList[i] = fullName;
            }
            Console.WriteLine("-----------------------------------");
            for (int i = 0; i < userCount; i++)
            {
                Console.WriteLine(namesList[i]);
            }
        }

static void Main(string[] args)
        {
            Console.WriteLine("please enter person count : ");
            var personCount = int.Parse(Console.ReadLine());
            string[] fullNames = new string[personCount];
            double[] heights = new double[personCount];
            double[] masList = new double[personCount];

            int i = 0;
            while (i < personCount)
            {
                Console.WriteLine("please enter person" + (i + 1) + " fullname: ");
                fullNames[i] = Console.ReadLine();

                Console.WriteLine("please enter person" + (i + 1) + " height: ");
                heights[i] = double.Parse(Console.ReadLine());

                Console.WriteLine("please enter person" + (i + 1) + " mass: ");
                masList[i] = double.Parse(Console.ReadLine());

                Console.WriteLine();
                i++;
            }
            Console.WriteLine("-----------------------------------------");

            for (i = 0; i < personCount; i++)
            {
                string fullName = fullNames[i];
                double mass = masList[i];
                double height = heights[i];

                double bmi = mass / (height * height);

                Console.WriteLine(fullName + " bmi : " + bmi);

            }
        }