Add project files.

TeglalapObjektum.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31624.102
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TeglalapObjektum", "TeglalapObjektum\TeglalapObjektum.csproj", "{F172D148-E6EB-4754-916A-B8F2CC2C3AA7}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{F172D148-E6EB-4754-916A-B8F2CC2C3AA7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F172D148-E6EB-4754-916A-B8F2CC2C3AA7}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F172D148-E6EB-4754-916A-B8F2CC2C3AA7}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F172D148-E6EB-4754-916A-B8F2CC2C3AA7}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {41E1AEE0-5F02-41C1-AB2F-BE5139837720}
+	EndGlobalSection
+EndGlobal

TeglalapObjektum/Program.cs

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+using System;
+
+namespace TeglalapObjektum
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Téglalap objektumok létrehozása:");
+            Teglalap t1 = new Teglalap(); //Példányosítás t1
+            Teglalap t2 = new Teglalap(); //Példányosítás t2
+            t1.aoldal = 7.5;
+            t1.boldal = 20.9;
+            t2.aoldal = 100;
+            t2.boldal = 24.7;
+            Console.WriteLine($"A t1 téglalap a: {t1.aoldal}, b: {t1.boldal} T: {t1.terulet()}");
+            Console.WriteLine($"A t2 téglalap a: {t2.aoldal}, b: {t2.boldal} T: {t2.terulet()}");
+
+            Teglalap t3 = new Teglalap();
+            t3.aoldal = 3;
+            t3.boldal = 120;
+            Console.WriteLine("t3 adatai:");
+            t3.kiir();
+            Console.WriteLine("t1 adatai:");
+            t1.kiir();
+
+
+        }
+
+
+    }
+}

TeglalapObjektum/Teglalap.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace TeglalapObjektum
+{
+    class Teglalap
+    {
+        public double aoldal;
+        public double boldal;
+
+        public double terulet()
+        {
+            return aoldal * boldal;
+        }
+
+        public void kiir()
+        {
+            Console.WriteLine($"a: {aoldal}, b: {boldal}, T: {terulet():F3}");
+        }
+    }
+}

TeglalapObjektum/TeglalapObjektum.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>