Evolution of a Programmer

High School/Jr. High

10 PRINT “HELLO WORLD”
20 END

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

(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”);
}
 

#include <iostream.h>
#include <string.h>

class string
{
private:
 int size;
 char *ptr;

public:
 string ( ) : 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);
}