# A Literate Hello, World!

## Introduction

A "Hello, World" program is one which simply outputs this text.

It originally cames from the book ["The C Programming Language"][c-programming]

and has since become the traditional first program to implement when learning a new programming language.

Here is a literate "Hello, World!".

[c-programming]: https://en.wikipedia.org/wiki/The_C_Programming_Language

## Implementation in C

We can define codeblocks with `---`.

--- hello world

printf("Hello, World!\n");

---

Blocks can then refer to one another to be included.

For example, all C programs need a main function.

--- /hello.c

@{includes}

int main() {

@{hello world}

return 0;

}

---

We need to include `stdio.h` to use the `printf` function.

--- includes

#include <stdio.h>

---

Blocks can also be referred to in prose.

For example @{includes}.