C++ Hello World Program with Code Explanation (2024)

C++ Hello World Program

The “Hello World” application is the first step in learning any programming language. It's as simple as displaying the message "Hello World" on the output screen.

This article will teach you how to write your first C++ program, that is "Hello World!"

Software Used for C++ Program

• CodeLite
• Turboc++
• TC
• GCC compiler
• Netbeans
• Eclipse

C++ Compiler

The position of the framework include files, a list of predefined macros, and other options for the EDG parser specifying language features and compatibility levels are all contained in a compiler description. Without a proper compiler specification for your compiler, you would not be able to successfully parse a software system.

General Architecture of the C++ Program

• Documentation
• Preprocessor Statements
• Global Declarations
• The main() function
• Local Declarations
• Program Statements and Expressions
• User Defined Functions

Use of Hello World Program

Hello World programs are traditionally used to demonstrate how the coding process works as well as to ensure that a language or system is working properly. They are typically the first programs that new coders learn and even those with little to no programming experience can quickly and correctly execute Hello World.

C++ Hello World Program Code

// c++ hello world program

#include <iostream>

int main() {

// Program code here

std::cout << "Hello world!";

return 0;

}

Explanation of C++ Hello World Program

1. Comment line: // c++ hello world program

As the name implies, comments are simply text written by programmers during the creation of code. You can write anything you like in comments; they don't affect the logic of the software in any way. However, they should be relevant to the code and have some context so that when someone else looks at your code, they can understand what you did just by reading your comment.

Two different ways to give comment line:

1. a) // This is used to represent the single line comment
2. b) /* This is used to represent the multiple line comment

suitable for more than one line of instruction

*/

Example Comment Line:

// c++ hello world program

/* c++ hello world program is

Helps to understand the execution of the

Program easily */

2. Header file: #include <iostream>

This statement instructs the compiler to include the iostream file in the output. This file includes input/output functions that can be used in our software.The preprocessor directive #include is used to include files in our software. The contents of the iostream file are included in the above code. This enables us to use cout to print output on the computer in our software. For the time being, just note that #include iostream> is needed to use cout, which allows us to print output to the screen.

Some of the header files are:

#include<Math.h>

#include<conio.h>

#include<string.h>

3. int main()

The main() function is required in any valid C++ programme. The curly braces indicate where the role begins and ends. This role is where code execution begins. As the name implies, this is our program's key function, and it is this function that starts the program's execution. The int here is the return type, indicating to the compiler that this function will return an integer value. The return 0 declaration at the end of the main function is primarily for this purpose.

4. Start of the Program: {

It says the beginning of the program code. Both sentences are grouped together with two curly brackets "...."or the reach of the main() function is indicated by curly braces.

5. Comment line: //program code

As the name implies, comments are simply text written by programmers during the creation of code. You can write anything you like in comments; they don't affect the logic of the software in any way. However, they should be relevant to the code and have some context so that when someone else looks at your code, they can understand what you did just by reading your comment.

6. std::cout << "Hello world!";

The text within the quotation marks is printed by std::cout. It has to be preceded by and then the format string. The format string in our example is "Hello World!"

The ; character denotes the end of a sentence.

7. return 0;

The key function returns value 0 at the end. This statement returns 0 from the main() function, indicating that the main function was successfully executed. The number 1 denotes a failed execution.

8. End of the code: }

This closed curly brace will be considered end of the program execution.

Program

Output

Another Example Code for Hello Message:

// c++ hello world program

#include <iostream>

int main() {

// Program code here

std::cout << "Welcome to the world of Cpp learning";

std::cout << "\nThis helps to learn cpp hello world program !";

return 0;

}

Output:

Welcome to the world of Cpp learning

This helps to learn cpp hello world program !

Explanation:

By considering the above example, User can include any statements within the double quotes. Which may be treated as string. Whatever statement or characters given with in double quotes will be printed exactly prints it on to the output screen.

Conclusion

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