
  main() { printf(&unix["\021%six\012\0"],(unix)["have"]+"fun"-0x60);}

Several points are important to understand in this program:

What is the symbol `unix' and what is its value in the program? Clearly `unix' is not a function, and since `unix' is not declared to be a data type (such as int, char, struct foo, enum, ...) what must `unix' be?
What is the value of the symbol "have"? (hint: the value is NOT 4 characters, or 'h', or a string) Consider the fact that:
char *x;
defines a pointer to a character (i.e. an address), and that the `=' assigns things is compatible types. Since: x = "have"; is legal C, what type of value is "have"?
Note that the following expressions yield the same value:
x[3] *(x+3) *(3+x)
since addition is communitive. What can be said about the value: 3[x]?