Example of Abstract Class

 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 }