In the C# programming language, a "Hello, world!" program is a simple program that prints only "Hello, world!". This program is commonly used to introduce beginners to a new programming language. With this simple program, beginners can understand how the C# programming language works. The Hello World program can be written in multiple ways. Let's see the top 4 ways to create a simple C# example:
- Simple Example
- Using System
- Using a public modifier
- Using namespace
Here, we will explore these four methods for displaying the phrase Hello World sequentially.
C# Simple Example
Let's consider an example to display the message "Hello World" in a straightforward manner.
Example
class C# Tutorial
{
static void Main(string[] args)
{
System.Console.WriteLine("Hello World!");
}
}
Output:
Hello World!
Working of C# Program
There are several main concepts that need to be learn while writing a C# program. By using the above program, we will understand the working of a C# program.
- class: It is used to represent a keyword that is used to define a class.
- ClassName (Program) : It is used to represent the name of the class. A class is a blueprint or template from which objects are created. It can have data members and methods.
- static: It is a keyword that means that the object is not required to access static members. Therefore, it saves memory.
- void: It is the return type of the method. It does not return any value. In such a case, a return statement is not required.
- Main: It is used to represent the method name. It is the entry point for any C# program. Whenever we run the C# program, the Main method is called first before any other method. It represents the startup of the program.
- string args: It is used for command-line arguments in the C# programming language. While running the C# program, we can pass values. These values are known as arguments that we can use in the program.
- Console.WriteLine("Hello World!"): Here, System is used to represent the namespace, Console is the class defined in the System namespace, and the WriteLine is the static method of the Console class that is used to write the text on the console.
C# Hello World Program Using System
In C# programming, we utilize the using directive to gain access to classes within a namespace by specifying their full qualified names. This directive simplifies the access to classes within the specified namespace. By including "using System;" at the beginning of the code, we can directly use the Console class without needing to explicitly mention System.Console.
Let's consider an example demonstrating how to display the text "Hello World" by utilizing the System class in C#.
Example
using System;
class C# Tutorial
{
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
}
}
Output:
Hello World!
Explanation:
In this instance, we've included the using System; directive, which allows direct access to the Console class without the need to specify System.Console. Within the Main function, we display the message "Hello World!" on the console by employing the Console.WriteLine method.
C# Hello World Example Using public modifier
In C#, we have the option to declare the public access modifier in front of both the class and the Main method. This allows external access to these elements and ensures that the program's starting point is visible to the runtime environment.
Let's consider an example demonstrating how to display the message "Hello World" in C# by employing the public access modifier.
Example
using System;
public class C# Tutorial
{
public static void Main(string[] args)
{
Console.WriteLine("Hello World!");
}
}
Output:
Hello World!
Explanation:
In this instance, we've designated both the C# Tutorial class and the Main method as public. This designation allows them to be accessed externally from the class, providing significant utility for more extensive applications.
C# Hello World Example Using namespace
In C#, developers have the ability to define classes within a namespace to cluster related classes. This practice aids in organizing code, preventing naming clashes, and ultimately enhancing the program's readability and maintainability.
Let's consider an instance where we utilize a namespace to display the message "Hello World" in C#.
Example
using System;
namespace ConsoleApplication1
{
public class C# Tutorial
{
public static void Main(string[] args)
{
Console.WriteLine("Hello World!");
}
}
}
Output:
Hello World!
Explanation:
In this instance, we are examining a C# Tutorial class enclosed within the ConsoleApplication1 namespace. Following this, we define the Main function as public and display the message "Hello World!" by calling the Console.WriteLine method.
Conclusion
In summary, the introductory Hello World Program in C# serves as a foundational illustration for novices embarking on their journey with the C# language. Throughout this guide, we have discussed the fundamental framework of a C# program, including namespaces, classes, methods, and the utilization of Console.WriteLine method for displaying output.
Hello World Program FAQs
The Hello World Program in C# is a simple program that outputs the text "Hello, World!" to the console. This program is commonly used as a beginner's introduction to a new programming language.
The introductory program known as the Hello World program serves as a fundamental and uncomplicated example within the C# programming language. It is particularly beneficial for novice programmers aiming to grasp the foundational syntax and layout of a C# program.
Yes, it is possible to create a Hello World program in C# without using the namespace method.
Yes, since namespaces are not obligatory in the Hello World Program, we have the freedom to directly compose the Hello World program using a class and the Main method. Namespaces are frequently employed to enhance organization in extensive projects.
In C# programming, we include the "using System;" directive to gain access to fundamental classes and functionalities provided by the .NET Framework.
In C# programming, the "using System;" directive allows us to utilize classes from the System namespace without the need to specify the complete name like System.Console.
The primary distinction between public and default class access in C# is that a public class can be accessed from any other class or assembly, while a default class (also known as internal) can only be accessed within the same assembly.
The primary contrast between public and default class access in C# lies in the fact that a public class is accessible from both outside its own class and assembly. In contrast, the default class can solely be accessed within the same assembly.
5) What is the use of the Main method in C#?
In C# coding language, the Main function serves as the starting point of the program's execution. This method is where the program begins its operation and can be defined with the static keyword. Additionally, it can include optional parameters such as string args.