Hello World Program in C++

 

The "Hello, World!" program is the simplest way to get started with C++. It helps you understand basic syntax, compilation, and execution.

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Code:

#include <iostream>  // Include input-output stream library
using namespace std; // Use standard namespace

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

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Explanation:

1. #include <iostream>

   • This is a preprocessor directive that includes the iostream library, which allows input and output operations.

2. using namespace std;

   • This tells the compiler to use the standard namespace, so we can use cout and cin without prefixing them with std::.

3. int main() { ... }

   • This is the main function, the entry point of any C++ program.

4. cout << "Hello, World!" << endl;

   • cout is used to display output on the screen.
   • << is the insertion operator.
   • "Hello, World!" is a string that gets printed.
   • endl moves the cursor to the next line.

5. return 0;

   • It indicates that the program ran successfully.

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How to Compile & Run:

Using a Compiler (G++)

1. Write the program in a file, e.g., hello.cpp
2. Compile the program using:

   g++ hello.cpp -o hello
   

3. Run the program using:

   ./hello
   

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Output:

Hello, World!

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