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中学阶段

          10 PRINT "HELLO WORLD"
          20 END
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大学一年级

          program Hello(input, output)
            begin
              writeln(’Hello World’)
            end.
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大学高年级

          (defun hello
            (print
              (cons ’Hello (list ’World))))
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初级程序员

          #include <stdio.h>
          void main(void)
          {
            char *message[] = {"Hello ", "World"};
            int i;

            for(i = 0; i < 2; ++i)
              printf("%s", message[i]);
            printf("\n");
          }
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编程老鸟

          #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 << end

            return(0);
          }
--------------------------------------------------------------------------------
编程高手

          [
          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