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

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*신임 교수
#include
void main(void) {
char *message[] = {"Hello ", "World"};
int i;

for(i = 0; i < 2; ++i)
printf("%s", message[i]);
printf("
");
}

-------------------------------

*계약직 전문가
#include

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

public:
string() : size(0), ptr(new char('')) {}

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 *);
};

// 생략...
str = "Hello World";
cout << str << endl;
return(0);
}

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

-------------------------------

*구루(지존) 해커
% cat
Hello, world.
^D