參考解答:
using System;
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
          Console.WriteLine("請輸入你的身高(公尺)");
          double height = double.Parse(Console.ReadLine());
          Console.WriteLine("請輸入你的體重(公斤)");
          double weight = double.Parse(Console.ReadLine());
          double bmi = weight / Math.Pow(height, 2);
          Console.WriteLine("你的BMI指數為"+bmi);
        }

    }
}