The evolution of the famous HELLO.C in the programer's life

[Phan Anh Son <Phan@PGSM.HU>]

Cha`o ca? la`ng, nha^'t la`ca'c ba'c CS,

Gu+?i ca'c ba'c va`i variation cu?a program HELLO.C no^?i tie^'ng ma`
cha('c ai cu~ng bie^'t
dde^? ca'c ba'c ddo.c gia?i tri'

Son,=20



The evolution of the famous HELLO.C in the programer's life
------------------------------------------------------------------------
--------

Secondary School

     10 PRINT "HELLO WORLD"
     20 END

1st year in the university

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

Last year in the university

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

Beginner professional programer

     #include <stdio.h>
     void main(void)
     { char *message[] =3D {"Hello ", "World"};
       int i;
        for(i =3D 0; i< 2; ++i)
        printf("%s", message[i]);
        printf("\n");
  }

Professional programer

     #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 =3D new char[size + 1];
          strcpy(ptr, s.ptr);
        }

        ~string()
        {
          delete [] ptr;
        }

        friend ostream &operator <<(ostream &, const string &);
        string &operator=3D(const char *);
      };

      ostream &operator<<(ostream &stream, const string &s)
      {
        return(stream << s.ptr);
      }

      string &string::operator=3D(const char *chrs)
      {
        if (this !=3D &chrs)
        {
          delete [] ptr;
         size =3D strlen(chrs);
          ptr =3D new char[size + 1];
          strcpy(ptr, chrs);
        }
        return(*this);
      }

      int main()
      {
        string str;

        str =3D "Hello World";
        cout << str << endl;

        return(0);
      }

Very very professional programer

      [
      uuid(2573F8F4-CFEE-101A-9A9F-00AA00342820)
      ]
      library LHello
      {
          // bring in the master library
          importlib("actimp.tlb");
          importlib("actexp.tlb");

          // bring in my interfaces
          #include "pshlo.idl"

          [
          uuid(2573F8F5-CFEE-101A-9A9F-00AA00342820)
          ]
          cotype THello
       {
       interface IHello;
       interface IPersistFile;
       };
      };

      [
      exe,
      uuid(2573F890-CFEE-101A-9A9F-00AA00342820)
      ]
      module CHelloLib
      {

          // some code related header files
          importheader(

Beginner hacker

    #!/usr/local/bin/perl
      $msg=3D"Hello, world.\n";
      if ($#ARGV =3D 0) {
        while(defined($arg=3Dshift(@ARGV))) {
          $outfilename =3D $arg;
          open(FILE, "" . $outfilename) =A6=A6 die "Can't write $arg: =
$!\n";
          print (FILE $msg);
          close(FILE) =A6=A6 die "Can't close $arg: $!\n";
        }
      } else {
        print ($msg);
      }
      1;

Experienced hacker


      #include

More experienced hacker

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

Profession hacker

     % cat
       Hello, world.
       ^D

Newly appointed manager

     10 PRINT "HELLO WORLD"
     20 END

Middle-level manager

     mail -s "Hello, world." bob@b12
     Bob, can you write a program for me until tomorrow,
     that display  "Hello word" on the screen?
     Thanks!
     ^D

Director

     % zmail jim
       I need a "Hello Word" program today afternoon.

CEO

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% mail To: ^X
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% logout

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