Question

Create the following hierarchy using C#. Create interface IPayable which has a method – GetPaymentAmount(). Create a class Invoice which inherits from IPayable and has following instance data: quantity and price per item. Create class Employee ( has first name, last name and Social Security Number ) and Salaried Employee ( Weekly Salary ) as shown in the hierarchy. Test all classes by creating objects and making use of Interface Polymorphism.

«interface IPayable - - - - - . - - - - - Invoice Employee SalariedEmployee

Answer 1

Screenshot

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Program

using System;
namespace InterfaceInheritanceInCSharp
{
    //Create an interface with a method
    public interface IPayable
    {
        double GetPaymentAmount();
    }
    //Create class that implements inteface
    public class Invoice : IPayable
    {
        //Attributes
        int quantity;
        double price;
        //Construtor
        public Invoice(int quant,double pr)
        {
            quantity = quant;
            price = pr;
        }
        //Implementation of inteface
        public double GetPaymentAmount()
        {
            return quantity * price;
        }
    }
    //Create class that implements inteface
    public class Employee : IPayable
    {
        //Attributes
        string firstName;
        string lastName;
        string ssn;
        //Constructor
        public Employee(string f, string l, string s)
        {
            firstName = f;
            lastName = l;
            ssn = s;
        }
        //Interface function
        public virtual double GetPaymentAmount()
        {
            throw new NotImplementedException();
        }
    }
    //Create a class that extends Employee
    public class SalriedEmployee: Employee
    {
        //Attribute
        double weeklySalary;
        //Constructor
        public SalriedEmployee(string fName,string lName,string ssn,double sal):base(fName, lName, ssn)
        {
            weeklySalary = sal;
        }
        //Implement
        public override double GetPaymentAmount()
        {
            return weeklySalary;
        }
    }
    //Test
    class Program
    {
        static void Main(string[] args)
        {
            //Object of Salried employee
            SalriedEmployee emp = new SalriedEmployee("Mugal", "Empire", "MM123456", 450);
            //Display weekly salary
            Console.WriteLine("Weekly salary = $" + emp.GetPaymentAmount());
            //Object of invoice class
            Invoice invoice = new Invoice(10, 12.5);
            //Display invoce total
            Console.WriteLine("Invoice of item = $" +invoice.GetPaymentAmount());
        }
    }
}

Output

Weekly salary = $450
Invoice of item = $125