using System; 

namespace Idepartment 

{ 

interface IcatWrite

{ 

 void Write(); 

} 

interface IcatRead 

{ 

 int Read(); 

} 

interface IcatSelecting 

{ 

void Selecting(int department); 

} 

interface IcatDisp 

{ 

void Disp(); 

} 

public class CatWrite: IcatWrite 

{ 

public void Write() 

{ 

Console.WriteLine("Departments Available"); 

Console.WriteLine("1- Cardiologist\n 2- Gyncologist \n 3- neurologist\n 4- urologist");

Console.WriteLine("Enter Your department"); 

} 

} 

public class CatRead: IcatRead 

{ 

 public int Read() 

 {

 int department; 

 department= Int16.Parse(Console.ReadLine()); 

return department; 

 } 

} 

public class CatSelecting: IcatSelecting 

{ 

public void Selecting(int department) 

{ 

switch(department) 

{ 

case 1: 

Console.WriteLine("\nYou are looking at cardiologist menu");

break; 

case 2: 

Console.WriteLine("\nYou are looking at Gynoclogist menu");

break; 

case 3: 

Console.WriteLine("\nYou are looking at neurologist menu");

break; 

case 4: 

Console.WriteLine("\nYou are looking at urologist menu");

break; 

default: 

Console.WriteLine("\nEnter valid department"); break; 

} 

}

} 

public class CatDisp: IcatDisp 

{ 

public void Disp() 

{ 

Console.WriteLine("\n\n You have selected a type of doctor"); } 

} 

public class read 

{ 

public static void Main() 

{ 

int dept_code; 

Console.WriteLine("Welcome to the columbia hospitala");

IcatWrite a=new CatWrite(); 

a.Write(); 

IcatRead b=new CatRead(); 

dept_code=b.Read(); 

IcatSelecting c=new CatSelecting(); 

c.Selecting(dept_code); 

IcatDisp t3= new CatDisp(); 

t3.Disp(); 

} 

} 

} 

​