Description

Problems for exercises and homework for the “C# OOP” course @ SoftUni”.
You can check your solutions here: https://judge.softuni.bg/Contests/1503/Polymorphism-Lab
1. MathOperation
NOTE: You need a public StartUp class with the namespace Operations.
Create a class MathOperations, which should have 3 times method Add(). Method Add() has to be invoked with:
• Add(int, int): int
• Add(double, double, double): double
• Add(decimal, decimal, decimal): decimal
You should be able to use the class like this:
StartUp.cs
public static void Main()
{
MathOperations mo = new MathOperations(); Console.WriteLine(mo.Add(2, 3));
Console.WriteLine(mo.Add(2.2, 3.3, 5.5));
Console.WriteLine(mo.Add(2.2m, 3.3m, 4.4m)); }
Examples
Output
5
11
9.9

Solution
Created MathOperation class should look like this:

2. Animals
NOTE: You need a public StartUp class with the namespace Animals.
Create a class Animal, which holds two fields:
• name: string
• favouriteFood: string
Animal has one virtual method ExplainSelf(): string.
You should add two new classes – Cat and Dog. Override the ExplainSelf() method by adding concrete animal sound on a new line. (Look at examples below) You should be able to use the class like this:
StartUp.cs
Animal cat = new Cat(“Pesho”, “Whiskas”);
Animal dog = new Dog(“Gosho”, “Meat”);
Console.WriteLine(cat.ExplainSelf());
Console.WriteLine(dog.ExplainSelf());
Examples
Output
I am Pesho and my fovourite food is Whiskas
MEEOW
I am Gosho and my fovourite food is Meat DJAAF
Solution

NOTE: You need a public StartUp class with the namespace Shapes.
Create a class hierarchy, starting with abstract class Shape:
• Abstract methods:
o CalculatePerimeter(): doulbe o CalculateArea(): double
• Virtual methods:
o Draw(): string
Extend the Shape class with two children:
• Rectangle
• Circle
Each of them need to have:
• Fields:
o height and width for Rectangle o radius for Circle
• Encapsulation for these fields
• A public constructor
• Concrete methods for calculations (perimeter and area)
• Override methods for drawing