C# (C-Sharp)is an Object-oriented Programming Language developed by Microsoft that intends to be a simple, modern, and general-purpose programming language for application development.
Ø Topics which going to covered
v Explain features of the object-oriented methodology
v Describe the phases of the object-oriented methodology
v Define classes in C#
v Declare variables
v Write and execute C# programs
Object-Oriented Methodology
Ø Object orientation is a software development methodology that is based on modeling a real-world system.
Ø An object oriented program consists of classes and objects.
Ø Object is the instance of class. It is state, behavior, unique identity. It interact with other objects through messages.
Characteristics of the Object-Oriented Approach
Ø Realistic modeling
Ø Reusability
Ø Resilience to change
Ø Existence as different forms
Phases of Object Orientation
Ø The following phases are involved in the software development:
v The Analysis phase
v The Design phase
v The Implementation phase
Introducing C#
Ø A program is a set of instructions to perform a specific task.
Ø Programming languages use programs to develop software applications.
Ø A compiler is a special program that processes the statements written in a particular programming language and converts them into a machine language.
Ø This process of conversion is called compilation.
Ø C#, also known as C-Sharp, is a programming language introduced by Microsoft.
Ø C# is specially designed to work with the Microsoft’s .NET platform.
Eg
Public Class student
{
Public static void main(String[] args)
{
Console.WriteLine(“Welcome to C# World”);
}
}
Note: Main() Function Is the entry point of an application .It Is used to create objects and invoke member function.
Declaring Variables
Ø A variable is a location in the memory that has a name and contains a value.
Ø A variable is associated with a data type that defines the type of data that can be stored in a variable.
Syntax
Eg:- int age=10;
Naming variables in C#
Ø The following rules are used for naming variables in C#:
v Must begin with a letter or an underscore
v Should not contain any embedded spaces or symbols
v Must be unique
v Can have any number of characters
Ø Keywords cannot be used as variable names
Declaration of Variable are of two types:
1)Value Type Variable: are those variable which stores the value in stack. Eg int,char,decimal,bool,float.
2)Reference Type Variable : are those variables which take the references of memory .Eg string and Object.
Simple Program in C# to Display Hello World!!
Class Student
{
Public void display()
{
Consolw.WriteLine(“Hello World !!”);
}
}
Class Demo
{
Public static void main(String[] args)
{
Student objstd=new Student();
Objstd.display();
}
}
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