OCP VIRTUAL CLASS | C# Online Compiler

OCP VIRTUAL CLASS by Hannah ML

using System;
public class airline
{
public virtual void book()
{
Console.WriteLine("Passengername"); 
string unName = Console.ReadLine(); 
Console.WriteLine("type of class"); 
string userName = Console.ReadLine(); 
Console.WriteLine("class id");
int choice = Convert.ToInt32(Console.ReadLine()); 
 
Console.WriteLine("Booking done");
}
}
public class Program
{
public static void Main()
{ Console.WriteLine("airline managment booking function"); 
Console.WriteLine("Enter 1 Passenger ");
Console.WriteLine("Enter 2 Cancel "); 
Console.WriteLine("Enter your choice:");
int choice = Convert.ToInt32(Console.ReadLine()); 
switch (choice)
{
case 1:
airline r = new airline(); 
r.book();
break; 
case 2:
Console.WriteLine("Cancelled"); 
break;
default:
Console.WriteLine("Invalid"); 
break;
}
}
}

​x
 
using System;
public class airline
{
public virtual void book()
{
Console.WriteLine("Passengername"); 
string unName = Console.ReadLine(); 
Console.WriteLine("type of class"); 
string userName = Console.ReadLine(); 
Console.WriteLine("class id");
int choice = Convert.ToInt32(Console.ReadLine()); 
 
Console.WriteLine("Booking done");
}
}
public class Program
{
public static void Main()
{ Console.WriteLine("airline managment booking function"); 
Console.WriteLine("Enter 1 Passenger ");
Console.WriteLine("Enter 2 Cancel "); 
Console.WriteLine("Enter your choice:");
int choice = Convert.ToInt32(Console.ReadLine()); 
switch (choice)
{
case 1:
airline r = new airline(); 
r.book();
break; 
case 2:
Console.WriteLine("Cancelled"); 
break;
default:
Console.WriteLine("Invalid"); 
break;
}
}
}
​

Compilation error (line 7, col 4): The type or namespace name 'BankingMenu' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 8, col 4): The type or namespace name 'BankingSystem' could not be found (are you missing a using directive or an assembly reference?)
Compilation error (line 17, col 24): The name 'Console' does not exist in the current context
Compilation error (line 18, col 22): The name 'Convert' does not exist in the current context
Compilation error (line 27, col 19): The name 'Console' does not exist in the current context
Compilation error (line 28, col 27): The name 'Convert' does not exist in the current context
Compilation error (line 37, col 19): The name 'Console' does not exist in the current context
Compilation error (line 38, col 28): The name 'Convert' does not exist in the current context

Last Run:	9:29:42 pm
Compile:	0.005s
Execute:	0s
Memory:	0b
CPU:	0s

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