Hello World

Programming

The classic "Hello, World!" program is the simplest C++ program. It demonstrates basic program structure and output using the standard library.

Program Structure

A C++ program must have a main() function as its entry point. The #include <iostream> directive includes the input/output stream library, which provides std::cout for output.

Implementation

#include <iostream>

int main() {
    std::cout << "Hello, World!" << std::endl;
    return 0;
}

Key Concepts

#include <iostream>: Includes the standard input/output library
std::cout: Standard output stream
<<: Stream insertion operator
std::endl: Inserts a newline and flushes the output buffer
return 0: Indicates successful program termination

Compilation and Execution

To compile and run this program:

g++ hello_world.cpp -o hello_world
./hello_world

Output:

Hello, World!