1 of 9

Design Pattern

(Object Oriented Programming → Part 1)

Name: Sheikh Thanbir Alam

Deg: Senior Software Programmer

Org: Army War Game Center, BD Army

2 of 9

What is OOP?

OOPs or object oriented programming is not something that you need. It is just an approach. It is way to analyse and design solutions of a problem.

3 of 9

Principles of OOP

Class.
Object.
Method and method passing.
Pillars of OOPs.

Encapsulation.
Inheritance.
Polymorphism.
Abstraction.
Compile-time polymorphism.
Runtime polymorphism.

4 of 9

Class

Constructor

Destructor

5 of 9

Lets create a “Virtual Console Robot”

Head (int)
HeadMaterial (string)
Eye (int)
EyeMaterial (string)
Hand (int)
HandMaterial (string)
Leg (int)
LegMaterial (string)
CanRun (Boolean)
CanFight (boolean)
CurrentLocation (string)

6 of 9

//Main Class

VirtualConsoleRobot ourPetRobot = new VirtualConsoleRobot();

ourPetRobot.Head = 1;

ourPetRobot.HeadMaterial = "Iron";

ourPetRobot.Eye = 3;

ourPetRobot.EyeMaterial = "Diamond";

ourPetRobot.Hand = 6;

ourPetRobot.HandMaterial = "Gold";

ourPetRobot.Leg = 2;

ourPetRobot.LegMaterial = "Silver";

ourPetRobot.CanFight = false;

ourPetRobot.CanRun = true;

ourPetRobot.CurrentLocation = "Daffodil_CSC";

//print robot information

ourPetRobot = null;

//VirtualConsoleRobot

public class VirtualConsoleRobot

{

public int Head { get; set; }

public string HeadMaterial { get; set; }

public int Eye { get; set; }

public string EyeMaterial { get; set; }

public int Hand { get; set; }

public string HandMaterial { get; set; }

public int Leg { get; set; }

public string LegMaterial { get; set; }

public bool CanRun { get; set; }

public bool CanFight { get; set; }

public string CurrentLocation { get; set; }

public VirtualConsoleRobot()

{

}

7 of 9

Do it now!

Send your robot to India.

Now,

Create another class name as “EnemyConcoleRobot”
Populate data from main class.

8 of 9

Function / Method

//Sum Calculator

public class SumCalculator

{

public int Value1;

public int Value2;

public SumCalculator()

{

}

public SumCalculator(int userV1, int userV2)

{

this.Value1 = userV1;

this.Value2 = userV2;

}

public void Sum()

{

int sum_result = Value1 + Value2;

Console.WriteLine(sum_result);

}

public int SumReturn()

{

int sum_result = Value1 + Value2;

return sum_result;

}

public int SumReturnWithOtherValue(int v1, int v2)

{

int sum_result = v1 + v2;

return sum_result;

}

//Main Class

static void Main(string[] args)

{

int firstValue = 7;

int secondValue = 5;

// SumCalculator ourCalculator = new SumCalculator();

// ourCalculator.Value1 = firstValue;

// ourCalculator.Value2 = secondValue;

SumCalculator ourCalculator = new SumCalculator(firstValue, secondValue);

ourCalculator.Sum();

int result = ourCalculator.SumReturn();

Console.WriteLine(result);

int resultCustomeValue = ourCalculator.SumReturnWithOtherValue(15, 6);

Console.WriteLine(resultCustomeValue);

}