Hello world

The so-called “Hello World” program is a small computer program that uses a simple print method to output the text “Hello World”. This shows in a simple way which instructions and components are required for a complete, executable program in a certain programming language. The “Hello World” program is often the first port of call for any programming language.

#include <iostream>  // Include the input-output stream library

int main() {
    std::cout << "Hello, World!" << std::endl;  // Print Hello, World! to the console
    return 0;  // Return 0 to indicate successful execution
}

Breakdown of the Code

1. #include <iostream>: This line includes the input-output stream library which is necessary for using std::cout.
2. int main(): This is the main function where the execution of the program begins.
3. std::cout << "Hello, World!" << std::endl;:
   • std::cout is used to print to the standard output (usually the console).
   • << is the stream insertion operator, which directs the string "Hello, World!" to std::cout.
   • std::endl is used to insert a newline character and flush the output buffer.
4. return 0;: This statement terminates the main function and returns 0 to the operating system, indicating that the program ended successfully.

Output

hello world