In 1978, The Developers Of The C Programming In 1978

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In 1978, the developers of the C programming

In 1978, the developers of the C programming
language (Kernighan and Ritchie) introduced
their new language to the world in a book
titled "THE C PROGRAMMING LANGUAGE."
The opening page of this book showed a C
program that simply prints "hello, world".
Since then, it has become common practice for
programming classes to begin with a similar
project.

'Hello World' programs with different levels of experience.

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
#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

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