got this from Deutsche Bahn for new year's eve - a plant in a can

wahre Liebe ist nicht nur schwarz und weiss ...

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Following happened:

$ ./program 
hello world
$ ./program > /dev/null
hello world
$ ./program > /dev/null 2> /dev/null
hello world

Solution:

$ ./program 0> /dev/null

What happened?
./program writes on STDIN instead on STDOUT or STDERR;
Code:
Zeilennummern

    1 #include <stdio.h>
    2 
    3 int main()
    4 {
    5   write(0, "hello world\n", 12);
    6 }