\section{Introduction}

This is a simple ``Hello, World'' program written in Noweb,
a literate programming tool.

\section{The Main Program}

The main program prints a greeting to the standard output.

<<hello.c>>=
#include <stdio.h>

<<Function declarations>>

int main(void) {
    <<Print greeting>>
    return 0;
}
@

\section{Implementation}

We define a function to print the greeting:

<<Function declarations>>=
void print_greeting(void);
@

<<Print greeting>>=
print_greeting();
@

Here is the implementation of the greeting function:

<<hello.c>>=
void print_greeting(void) {
    printf("Hello, World!\n");
}
@