C graphical tutorial (Fourth Edition)_ Chapter 15 interface: interfacesamplep268

using System;

namespace Chapter15InterfaceSampleP268
{
    interface IInfo
    {
        string GetName();
        string GetAge();
    }
    class CA :IInfo
    {
        public string Name;
        public int Age;
        public string GetName() { return Name; }
        public string GetAge() { return Age.ToString(); }
    }
    class CB : IInfo
    {
        public string First;
        public string Last;
        public double PersonAge;
        public string GetName() { return First+""+Last; }
        public string GetAge() { return PersonAge.ToString(); }
    }

    class Program
    {
        static void PrintInfo(IInfo item)
        {
            Console.WriteLine("Name:{0},Age:{1}",item.GetName(),item.GetAge());

        }
        static void Main(string[] args)
        {
            CA a = new CA() { Name = "JohnDoe", Age = 35 };
            CB b = new CB() { First = "Jane",Last= "Doe",PersonAge = 33 };
            PrintInfo(a);
            PrintInfo(b);
            Console.WriteLine("Hello World!");
        }
    }
}