How do interfaces facilitate writing a method that processes different payment types like CreditCard and PayPal?

hard🚀 Application Q9 of Q15

C Sharp (C#) - Interfaces

ABy forcing all payment classes to inherit from a single base class

BBy defining a common interface with payment methods that each payment type implements

CBy using abstract classes instead of interfaces

DBy writing separate methods for each payment type

Step-by-Step Solution

Solution:

Step 1: Common interface for payments
Define an interface like IPayment with methods such as ProcessPayment().
Step 2: Implement interface in payment classes
CreditCard and PayPal classes implement IPayment with their own logic.
Step 3: Write method accepting interface type
The method can accept IPayment parameter and work with any payment type.
Final Answer:
By defining a common interface with payment methods that each payment type implements -> Option B
Quick Check:
Interfaces enable polymorphic method parameters [OK]

Quick Trick: Use interfaces to unify different payment types [OK]

Common Mistakes:

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