C# 12

C# is a popular cross platform programming language used to creating wide ranging of applications like Web, Desktop, or Mobile. 

 

You can create a C# application using wide range of options like  Visual Studio or  Visual Studio Code.

Here I am concentrating on .Net CLI with Visual Studio Code.

.Net CLI

.Net CLI (Command Line Interface) can be used to create and build .Net application.

 

As mentioned in the options dotnet -h or dotnet --help can be use to display .net help.

Creating a .Net CLI Console project.

 dotnet new console -o HelloConsole  

 

This command creates a console application within a folder called HelloConsole inside the current folder.

code . opens the current folder which comprises of the project in Visual Studio Code.

Top Level Statement

Program.cs file within project contains WriteLine method of Console class for displaying a message in the command prompt. 

C# follows Pascal case. Identifiers should stat with capital letter. So Console's C, WriteLine's W and L should be capital.

 Console.WriteLine("Hello Shalvin P D");  

Memory Variable

 string name = "Shalvin P D";  
 Console.WriteLine("Hello, {0}", name);  

Interpolation

 string name = "Shalvin";  
 Console.WriteLine($"Hello {name}");  

Multiple Memory Variable

 string name = "Shalvin";  
 string location = "Kochi";  
 Console.WriteLine($"Hello {name}, located at {location}.");  

Memory Variable Console.ReadLine

 string name;  
 Console.WriteLine("Enter your Name: ");  
 name = Console.ReadLine();  
 Console.WriteLine($"Hello {name}");  

Multiple String Memory Variables

 string name, location;  
 Console.WriteLine("Enter your Name: ");  
 name = Console.ReadLine();  
 Console.WriteLine("Enter your Location: ");  
 location = Console.ReadLine();  
 Console.WriteLine($"Hello {name}, located at {location}.");  

Integer Memory Variable

 int i, j, res;  
 i = 23;  
 j = 45;  
 res = i + j;  
 Console.WriteLine(res);  

Int32.Parse (Simple Calculator)

 int i, j, res;  
 Console.WriteLine("Enter Value 1: ");  
   i = Int32.Parse(Console.ReadLine());  
 Console.WriteLine("Enter Value 2: ");  
   j = Int32.Parse(Console.ReadLine());  
 res = i + j;  
 Console.WriteLine(res);  

If Statement

 string city;  
 Console.WriteLine("Enter the Name of the City: ");  
 city = Console.ReadLine();  
 if (city == "Kochi")  
 {  
   Console.WriteLine("Industrial Capital of Kerala");  
 }  

If else

 string city;  
 Console.WriteLine("Enter the Name of the City: ");  
 city = Console.ReadLine();  
 if (city == "Kochi")  
 {  
   Console.WriteLine("Industrial Capital of Kerala");  
 }  
 else  
 {  
   Console.WriteLine("I don't know");  
 }  

Multiple else if

 string city;  
 Console.WriteLine("Enter the Name of the City: ");  
 city = Console.ReadLine();  
 if (city == "Kochi")  
 {  
   Console.WriteLine("Industrial Capital of Kerala");  
 }  
 else if (city == "Trichur")  
 {  
   Console.WriteLine("Cultural Capital of India");  
 }  
 else if (city == "Trivandrum")  
 {  
   Console.WriteLine("Capital of Kerala");  
 }  
 else  
 {  
   Console.WriteLine("I don't know");  
 }