gistfile1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace salary
{
    class Program
    {
        static void Main(string[] args)
        {
            
            double H = YacineReadLine("Enter You Height : ");
            double W = YacineReadLine("Enter You Width : ");
            
            double S = H*W*0.5;
            
            Console.Write("Your Triangle Area is : ");
            Console.Write(S);
            
            Console.ReadKey();
        }
        
        // Yacine this is called Method it has string as Input and double as Output
        double YacineReadLine(string message)
        {
          Console.Write(message);
          
          string X = Console.ReadLine();
          
          double Y = double.Parse(X);
          
          return Y;//Output value must be double
        }
    }
}