using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace OOP1

{

    class Program

    {

        static void Main(string[] args)

        {

            //using constructor to create a new person object

            Person person1 = new Person("Steve", "Smith", 39, "M", "British", 1.7);

            person1.sayHello();

            Person person2 = new Person("Wendy", "West", 27, "F", "Welsh", 1.6);

            person2.sayHello();

​

            Child littleone = new Child("Billy", "Brown", 5, "M", "British", 1.1, "Merchant Taylors");

​

            Person[] people = new Person[3];

            people[0] = new Person("Brian", "Cox", 50, "M", "British", 1.85);

​

        }

​

        //define class

        public class Person

        {

            //DEFINE attributes

            private string Firstname;

            private string Surname;

            private int Age;

            private string Sex;

            private string Nationality;

            private double Height;

​

            //constructor method - A PROCEDURE used to INSTANTIATE AN OBJECT //new

            public Person(string f, string s, int a, string sex, string nation, double h)

            {

                Firstname = f;  // THE F BIT IS BEING PASSED IN, it is setting the FIRSTNAME

                Surname = s;

                Age = a;

                Sex = sex;

                Nationality = nation;

                Height = h;

            }

​

            public void sayHello()

            {

                Console.WriteLine("HELLO my name is {0} {1}!", Firstname, Age);

                Console.ReadKey();

            }

        }

​

        public class Child : Person

        {

​

            //DEFINE attributes

            private string Firstname;

            private string Surname;

            private int Age;

            private string Sex;

            private string Nationality;

            private double Height;

            private string School;

​

            public Child(string f, string s, int a, string sex, string n, double h, string sc) :  base (f,s,a,sex,n,h)

            {

​

                Firstname = f;  // THE F BIT IS BEING PASSED IN, it is setting the FIRSTNAME

                Surname = s;

                Age = a;

                Sex = sex;

                Nationality = n;

                Height = h;

                School = sc;

            }

​

            public void SayHello()

            {

                Console.WriteLine("HELLO my name is {0} {1} and I go to {2}!", Firstname, Age, School);

                Console.ReadKey();

            }

        }

    }

}

​