Console Application

We will start our console application with the popular “Hello World” because that is always the first example in any programming language. Please pardon me; I will like to quickly introduce two keywords in C#. They are;

        1.   Console.ReadlLine(): used to feed data into the computer

        2.   Console.WriteLine(): used to output result or display text on the screen.

Now let us proceed to write the simple and common “Hello World” program

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace helloworld

{

    class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine("Hello World");

        }

    }

}

Waoooooooh, welcome to your first C# program. I know that a lot of people will be discouraged because the code is too much. You shouldn’t be. The truth is that if you are using the latter of visual studio (2005 till date), most of the code is already written for you. All you need to do is to go to last of { } and add your code.

Some persons may ask, how can we get to the coding environment of console application of visual C#? Follow the steps below.

Steps to enter the coding environment of visual C# console application:

1. Click on file
2. Point to new 
3.  Click on projects 
4. Select console application

    5. Change the application name (you may decide to use the default name

        6. Click ok

That is the coding environment you are looking at.

Start your coding in-between the last { }, e.g.

static void Main(string[] args)

        {

            Console.WriteLine("Hello World");

        }

How do I see the output of my program. Follow the steps below.

How to run console application:

       1.   On the display menu, click on “Build”.

       2.   Click “Build helloworld” (the name you gave to your application). If there is no error in your application, the application will build successfully.

       3.   On the display menu again, click on “Debug”.

       4.   Click on “Start without Debugging”.

You will see a black window which is referred to as the DOS prompt or DOS window showing “Hello World”.

We will perform series of calculations as we move on. But before I continue let me introduce you to another keyword in C#. As a programmer, you can write plenty of code and later forget in future what those codes do. To avoid that, you need comment. Next we talk about comments.