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Date: Fri, 9 Feb 1996 13:22:42 +0100
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To: chat@freebsd.org
Subject: FYI: The Evolution of a Programmer
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From: Rob Bednark <rob@c2s.mn.org> 30 Jan 1996 15:20:00 -0600
From: David Reeg <dreeg@c2s.mn.org> 30 Jan 1996 11:19:44 -0600


 -----------------------------
 The Evolution of a Programmer
 -----------------------------

 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

========================================================================