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First C++ Program: “Hello World”

The “Hello World” program in the C++ programming language is the first program written by a beginner C++ programmer. The Hello World program is the first program code written by a C++ user. This program displays the Hello World text message information on your console screen.

How the first program in C++ programming helps beginners.

• To understand the basic C++ program structure.
• To understand the C++ program input and output statements.
• To understand the C++ program function behavior pattern.
• To understand the C++ created program compilation and execution process.

Basic first C++ Hello World program structure.

#include <iostream>

using namespace std;

int main() {

cout << “Hello World, Welcome to C++ programming”;

return 0;

}

Explanation of the C++ Hello World program.

#include <iostream>

• #include – This is a built-in library essential preprocessor directive file in a C++ program.
• iostream – This refers to the input-output stream library method operation in a C++ program.

C++ program statement.

• cout – This is used to display output statement message information in a C++ program.
• cin – This is used to accept user input values ​​in a C++ program. You can accept user input values ​​in this C++ program.

using namespace std;

• std namespace – This supports standard C++ functions and object libraries in a C++ program.
• This allows us to use the cout statement directly instead of writing the std::cout statement in a user-defined program statement.

int main()

• main() – This is a built-in program start library function. This is where every C++ program starts.
• The initial execution of any C++ program begins with this function.
• Here int means that this function returns an integer value.

C++ curly braces { } brackets.

{

}

• Curly braces used in C++ programs represent the body of a function.
• All C++ program statements are written inside these curly braces.

cout output statement.

cout << “Hello World, Welcome to C++ programming”;

• The cout statement in a C++ program is used to output a user-defined text message to the console screen.
• The << in the cout statement is also known as the insertion operator.
• It prints the text message “Hello World, Welcome to C++ programming” in the cout statement to the console screen.

return 0; statement.

return 0;

• The return statement here represents successful program operation in a C++ program.
• A value of 0 in the return statement means that the current program ran without any errors or issues.

Program Output.

Hello World, Welcome to C++ programming

All steps to run a basic C++ program.

Creating a C++ program can be done using any of the Microsoft Visual Studio, Code::Blocks, and CLion IDE applications installed on your computer.

Step 1:

Open any of the C++ IDE applications installed on your desktop/laptop computer.

For example:

• Code::Blocks
• Microsoft Visual Studio
• CLion

Step 2:

Create a new empty C++ program file.

Step 3:

Now manually type in your program name, Hello World.

Step 4:

Save the Hello World program file to secondary storage with a .cpp extension.

Example.

firstprog.cpp

Step 5:

Now compile the program source code written in the firstprog.cpp program and run it on your computer.

C++ Program Compilation Process.

The C++ program you write goes through several stages and finally generates console screen output. For example,

Program source code → Compilation phase → Object code → Linking → Executable program source code

Avoid some common mistakes for beginner C++ users.

Novice programmers accidentally miss the semicolon operator in the cout statement.

Incorrect statement:

cout << “Welcome to C++ programming”

Correct statement:

cout << “Welcome to C++ programming”;

Using the wrong header file method.

Incorrect statement:

#include <iostream.h>

Correct statement:

#include <iostream>

Missing namespace:

Incorrect statement:

cout << “Welcome to C++ programming”;

Without statement:

using namespace std;

Correct statement:

std::cout << “Welcome to C++ programming”;

Example of a modified correct Hello World program.

#include <iostream>

using namespace std;

int main() {

cout << “Hello World, Welcome to C++ programming”;

return 0;

}

Output message.

Hello World, Welcome to C++ programming

Important Features and function of a basic c++ program.

Conclusion of “Hello World” C++ First Program.

The “Hello World” program is the first step in learning the C++ language. It helps any beginner user to introduce and understand all the basic steps, syntax, and program structure of a C++ program. It includes C++ program libraries, important program functions, input/output statements, and all the steps and processes of program execution. By understanding this simple program, C++ users can design and develop more complex C++ program application software.