Example of Abstract Class

The Vehicle class has abstract members that must be implemented by the Car class or any other class that is inherited from the Vehicle class.

The Vehicle class has three abstract members, two properties, Distance and Time and a method, Speed.

 1 using System;  
 2 namespace AbstractExample  
 3 {  
 4     abstract class Vehicle  
 5     {  
 6         public abstract double Distance { get; set; }  
 7         public abstract double Time { get; set; }  
 8         public abstract double Speed();  
 9     }   
10     class Car : Vehicle  
11     {  
12         double mDistance, mTime = 0.0;  
13         public override double Distance  
14         {  
15             get  
16             {  
17                 return mDistance;  
18             }  
19             set  
20             {  
21                 if (value <= 0)  
22                 {  
23                     mDistance = 1;  
24                 }  
25                 else  
26                 {  
27                     mDistance = value;  
28                 }  
29             }  
30         }  
31         public override double Time  
32         {  
33             get  
34             {  
35                 return mTime;  
36             }  
37             set  
38             {  
39                 if (value <= 0)  
40                 {  
41                     mTime = 1;  
42                 }  
43                 else  
44                 {  
45                     mTime = value;  
46                 }  
47             }  
48         }   
49         public override double Speed()  
50         {  
51             double speed = 0.0;  
52             double hours = mTime / 60;  
53             speed = mDistance / hours;  
54             return speed;  
55         }  
56     }   
57     class Program  
58     {  
59         static void Main(string[] args)  
60         {  
61             double speed = 0.0;  
62             Car objCar = new Car();  
63             Console.WriteLine("Enter the Distance");  
64             objCar.Distance = Double.Parse(Console.ReadLine());  
65             Console.WriteLine("Enter the time in minutes");  
66             objCar.Time = Double.Parse(Console.ReadLine());  
67             speed = objCar.Speed();  
68             Console.WriteLine("Car speed is {0:0.00}", speed);  
69             Console.Read();  
70         }  
71     }  
72 }