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
void main(void)
{
char *message[] = {"Hello ", "World"};
int i;
for(i = 0; i < 2; ++i)
printf("%s", message[i]);
printf("\n");
}

Experienced Hacker

#include
#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 Officer

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