here here I need to begin a course in C Sharp
I need to take you from scratch to professional
so
you need to follow me in this video to understand everything I need to tell you
at first
we study console application in C sharp
Look the above figure every rectangle represent a course our various course is C C Sharp fundamentals
red rectangle contains four courses .
The four course is named building block of C Sharp language
1-C Sharp fundamentals
2 -object oriented programming o o p
3- SQL server database
4- edo.net
i
After 4 courses we continue other courses
C # FIRST COURSE CONSOLE APPLICATION
Tutorial: Create a simple C# console app in Visual Studio
In this tutorial, you use Visual Studio to create and run a C# console app, and explore some features of the Visual Studio integrated development environment (IDE). This tutorial is part 1 of a two-part tutorial series.
In this tutorial, you:
Create a Visual Studio project.
Create a C# console app.
Debug your app.
Close your app.
Inspect your complete code.
In part 2, you extend this app to add more projects, learn debugging tricks, and reference third-party packages.
Prerequisites
You must have Visual Studio installed.
If you haven't already installed Visual Studio, go to the Visual Studio downloads page to install it for free.
Create a project
To start, create a C# application project. The project type comes with all the template files you need.
Open Visual Studio, and choose Create a new project in the Start window.
In the Create a new project window, select All languages, and then choose C# from the dropdown list. Choose Windows from the All platforms list, and choose Console from the All project types list.
After you apply the language, platform, and project type filters, choose the Console App template, and then select Next.
In the Configure your new project window, type or enter Calculator in the Project name box, and then select Next.
In the Additional information window, select .NET 7.0 for your target framework, then select Create.
Visual Studio opens your new project, which includes default "Hello World" code.
To view it in the editor, select the code file Program.cs in the Solution Explorer window, which is typically on the right-hand side of Visual Studio.
The single code statement calls the WriteLine method to display the literal string "Hello, World!" in the console window. If you press F5, you can run the default program in Debug mode. After the application runs in the debugger, the console window stays open. Press any key to close the console window.
Create the app
In this section, you:
Explore some basic integer math in C#.
Add code to create a basic calculator app.
Debug the app to find and fix errors.
Refine the code to make it more efficient.
Explore integer math
Start with some basic integer math in C#.
In Solution Explorer, in the right pane, select Program.cs to display the file in the code editor
In the code editor, replace the default "Hello World" code that says Console.WriteLine("Hello World!");.
Replace the line with the following code:
int a = 42;
int b = 119;
int c = a + b;
Console.WriteLine(c);
Console.ReadKey();
If you type the code, the Visual Studio IntelliSense feature offers you the option to autocomplete the entry.
To build and run your app, press F5, or select the green arrow next to the name Calculator in the top toolbar.
A console window opens that shows the sum of 42 + 119, which is 161.
lose the console window.
Optionally, you can change the operator to change the result. For example, you can change the + operator in the int c = a + b; line of code to - for subtraction, * for multiplication, or / for division. When you run the app, the result changes accordingly.
Add code to create a calculator
Continue by adding a more complex set of calculator code to your project.
In the code editor, replace all the code in Program.cs with the following new code:
C#
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// Declare variables and then initialize to zero.
int num1 = 0; int num2 = 0;
// Display title as the C# console calculator app.
Console.WriteLine("Console Calculator in C#\r");
Console.WriteLine("------------------------\n");
// Ask the user to type the first number.
Console.WriteLine("Type a number, and then press Enter");
num1 = Convert.ToInt32(Console.ReadLine());
// Ask the user to type the second number.
Console.WriteLine("Type another number, and then press Enter");
num2 = Convert.ToInt32(Console.ReadLine());
// Ask the user to choose an option.
Console.WriteLine("Choose an option from the following list:");
Console.WriteLine("\ta - Add");
Console.WriteLine("\ts - Subtract");
Console.WriteLine("\tm - Multiply");
Console.WriteLine("\td - Divide");
Console.Write("Your option? ");
// Use a switch statement to do the math.
switch (Console.ReadLine())
{
case "a":
Console.WriteLine($"Your result: {num1} + {num2} = " + (num1 + num2));
break;
case "s":
Console.WriteLine($"Your result: {num1} - {num2} = " + (num1 - num2));
break;
case "m":
Console.WriteLine($"Your result: {num1} * {num2} = " + (num1 * num2));
break;
case "d":
Console.WriteLine($"Your result: {num1} / {num2} = " + (num1 / num2));
break;
}
// Wait for the user to respond before closing.
Console.Write("Press any key to close the Calculator console app...");
Console.ReadKey();
Select the Calculator button or press F5 to run your app.
A console window opens.
In the console window, follow the prompts to add the numbers 42 and 119 together.
Your app should look similar to the following screenshot:
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