High School/Jr. High

	10 PRINT "HELLO WORLD"
	20 END

First year in College

	program Hello(input, output)
	begin
		writeln('Hello World')
	end.

Senior year in College

	(defun hello
		(print
			(cons 'Hello (list 'World))))

New professional

	#include <stdio.h>
	void main(void)
	{
	  char *message[] = {"Hello ", "World"};
	  int i;

	  for(i = 0; i < 2; ++i)
	    printf("%s", message[i]);
	  printf("\n");
	}

Seasoned professional

	#include <iostream.h>
	#include <string.h>
	class string
	{
	private:
		int size;
		char *ptr;
	public:
		string() : size(0), ptr(new char('\0')) {}
		string(const string &s) : size(s.size)
		{
			ptr = new char[size + 1];
	       	strcpy(ptr, s.ptr);
		}
		~string()
		{
			delete [] ptr;
		}
		friend ostream &operator <<(ostream &, const string &);
		string &operator=(const char *);
	};
	ostream &operator<<(ostream &stream, const string &s)
	{
		return(stream << s.ptr);
	}
	string &string::operator=(const char *chrs)
	{
		if (this != &chrs)
		{
			delete [] ptr;
			size = strlen(chrs);
			ptr = new char[size + 1];
			strcpy(ptr, chrs);
		}
		return(*this);
	}

	int main()
	{
		string str;
		str = "Hello World";
		cout << str << endl;
		return(0);
	}

Apprentice Hacker

	#!/usr/local/bin/perl
	$msg="Hello, world.\n";
	if ($#ARGV >= 0)
	{
		while(defined($arg=shift(@ARGV)))
		{
			$outfilename = $arg;
			open(FILE, ">" . $outfilename) || die "Can't write $arg: $!\n";
			print (FILE $msg);
			close(FILE) || die "Can't close $arg: $!\n";
		}
	}
	else
	{
		print ($msg);
	}
	1;

Experienced Hacker

	#include <stdio.h>
	#define S "Hello, World\n"
	main(){exit(printf(S) == strlen(S) ? 0 : 1);}

Seasoned Hacker

	% cc -o a.out ~/src/misc/hw/hw.c
	% a.out

Guru Hacker

	% cat
	Hello, world.
	^D

New Manager

	10 PRINT "HELLO WORLD"
	20 END

Middle Manager

	mail -s "Hello, world." bob@b12
	Bob, could you please write me a program that prints "Hello, world."?
	I need it by tomorrow.
	^D

Senior Manager

	% zmail jim
	I need a "Hello, world." program by this afternoon.

Chief Executive

	% letter
	letter: Command not found.
	% mail
	To: ^X ^F ^C
	% help mail
	help: Command not found.
	% damn!
	!: Event unrecognized
	% logout