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  1. using System;
  2. using static System.Console;
  3. // i will use constructor injection in here 
  4. // i know i should make it in sperate files but just so i could publish on ideone and i think it doesnt need a repo in github 
  5. public interface Ipayment
  6. {
  7.     public string completePayement();
  8. }
  9.  
  10. class paypalpayement : Ipayment
  11. {
  12.     public string completePayement()
  13.     {
  14.         return $"Paypal payment is successful ";
  15.     }
  16. }
  17.  
  18. class creditcardpayment : Ipayment
  19. {
  20.     public string completePayement()
  21.     {
  22.         return $"credit card payment is succsseful ";
  23.  
  24.     }
  25. }
  26.  
  27. class extendedpayment : Ipayment
  28. {
  29.     public string completePayement()
  30.     {
  31.         return $" the extended payment is successful operation ";
  32.  
  33.     }
  34.  
  35. }
  36.  
  37. class pay
  38. {
  39.     private readonly Ipayment ipayment;
  40.  
  41.     public pay(Ipayment payemnt )
  42.     {
  43.         ipayment = payemnt;
  44.     }
  45.  
  46.     public void finishpay()
  47.     {
  48.         WriteLine(ipayment.completePayement());
  49.     }
  50. }
  51.  
  52. public class Test
  53. {
  54.     public static void Main()
  55.     {
  56.  
  57.  
  58.         Ipayment creditcard=new creditcardpayment();
  59.         pay m1 = new pay(creditcard);
  60.         m1.finishpay();
  61.         creditcard = new paypalpayement();
  62.         m1 = new pay(creditcard);
  63.             m1.finishpay();
  64.             creditcard = new extendedpayment();
  65.             m1 = new pay(creditcard);
  66.             m1.finishpay();
  67.  
  68.     }
  69. }
Success #stdin #stdout 0.05s 28592KB
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stdin
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Standard input is empty
stdout
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credit card payment is succsseful 
Paypal payment is successful 
 the extended payment is successful operation
https://ideone.com/uzPdtk
language:
C# (NET 6.0)
created:
11 days ago
visibility:
public

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