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Grading policy

1. Midterm-1 :

1.1. All Lab work marks up to lab7 = 25 marks

1.2. All homework marks up to hw6 = 5 marks

1.3. Midterm1 = 25 + 5 = 30

2. Midterm-2 :

2.1. All lab work marks from lab8 to lab12 = 10 marks

2.2. All homework marks from hw7 to hw12 = 5 marks

2.3. Mini project = 15 marks

2.4. Midterm2 = 10 + 5 + 15 = 30

3. Final = 40

4. Total = M1 + M2 + Final = 30 + 30 + 40 = 100

Recommendations Prerequisites for this course: Programming in Java / C++ In this course called “Object Oriented Programming” we will not start from beginning of the programming course like “what is an integer, what is double, what is if-else or loops, etc.”, instead we will see how to program windows form applications for desktop.

C# Overview

C# is a modern, general-purpose, object-oriented programming language developed by Microsoft.

C# was developed by Anders Hejlsberg and his team during the development of .Net Framework.

Writing C# Programs on Linux or Mac OS

Although the.NET Framework runs on the Windows operating system, there are some alternative versions that work on other operating systems. Mono is an open-source version of the .NET Framework which includes a C# compiler and runs on several operating systems, including various flavors of Linux and Mac OS.

The stated purpose of Mono is not only to be able to run Microsoft .NET applications cross-platform, but also to bring better development tools to Linux developers. Mono can be run on many operating systems including Android, BSD, iOS, Linux, OS X, Windows, Solaris and UNIX.

C# Program Structure

Let us look at a simple code that would print the words "Hello World":

using System;

namespace HelloWorldApplication

{

class HelloWorld

{

static void Main(string[] args)

{

/* my first program in C# */

Console.WriteLine("Hello World");

Console.ReadKey();

}

When the above code is compiled and executed, it produces the following result:

Hello World

Let us look at various parts of the above program:

· The first line of the program using System; - the using keyword is used to include the System namespace in the program. A program generally has multiple using statements.

· The next line has the namespace declaration. A namespace is a collection of classes. The HelloWorldApplication namespace contains the class HelloWorld.

· The next line has a class declaration, the class HelloWorld contains the data and method definitions that your program uses. Classes generally would contain more than one method. Methods define the behavior of the class. However, the HelloWorld class has only one method Main.

· The next line defines the Main method, which is the entry point for all C# programs. The Main method states what the class will do when executed

· The next line /*...*/ will be ignored by the compiler and it has been put to add additional comments in the program.

· The Main method specifies its behavior with the statement Console.WriteLine("Hello World"); WriteLine is a method of the Console class defined in the System namespace. This statement causes the message "Hello, World!" to be displayed on the screen.

· The last line Console.ReadKey(); is for the VS.NET Users. This makes the program wait for a key press and it prevents the screen from running and closing quickly when the program is launched from Visual Studio .NET.

It's worth to note the following points:

· C# is case sensitive.

· All statements and expression must end with a semicolon (;).

· The program execution starts at the Main method.

· Unlike Java, file name could be different from the class name.

Compile & Execute a C# Program:

If you are using Visual Studio.Net for compiling and executing C# programs, take the following steps:

· Start Visual Studio.

· On the menu bar, choose File, New, Project.

· Choose Visual C# from templates, and then choose Windows.

· Choose Console Application.

· Specify a name for your project, and then choose the OK button.

· The new project appears in Solution Explorer.

· Write code in the Code Editor.

· Click the Run button or the F5 key to run the project. A Command Prompt window appears that contains the line Hello World.

You can compile a C# program by using the command-line instead of the Visual Studio IDE:

· Open a text editor and add the above-mentioned code.

· Save the file as helloworld.cs

· Open the command prompt tool and go to the directory where you saved the file.

· Type csc helloworld.cs and press enter to compile your code.

· If there are no errors in your code, the command prompt will take you to the next line and would generate helloworld.exe executable file.

· Next, type helloworld to execute your program.

· You will be able to see "Hello World" printed on the screen.

C# Basic Syntax

In Object-Oriented Programming methodology, a program consists of various objects that interact with each other by means of actions. The actions that an object may take are called methods. Objects of the same kind are said to have the same type or, more often, are said to be in the same class.

For example, let us consider a Rectangle object. It has attributes like length and width. Depending upon the design, it may need ways for accepting the values of these attributes, calculating area and display details.

Let us look at an implementation of a Rectangle class and discuss C# basic syntax, on the basis of our observations in it:

using System;

namespace RectangleApplication

{

class Rectangle

{

// member variables

double length;

double width;

public void Acceptdetails()

{

length = 4.5;

width = 3.5;

}

public double GetArea()

{

return length * width;

}

public void Display()

{

Console.WriteLine("Length: {0}", length);

Console.WriteLine("Width: {0}", width);

Console.WriteLine("Area: {0}", GetArea());

}

class ExecuteRectangle

{

static void Main(string[] args)

{

Rectangle r = new Rectangle();

r.Acceptdetails();

r.Display();

Console.ReadLine();

}

When the above code is compiled and executed, it produces the following result:

Length: 4.5

Width: 3.5

Area: 15.75

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