Mystery program

This program is system-dependent, it will run correctly on many different systems. Try it on your machine.

#if (VAX || PC)
        #define HEX0 0x6c6c6548
        #define HEX1 0x77202c6f
        #define HEX2 0x646c726f
        #define HEX3 0x00000a21
#else
        #define HEX0 0x48656c6c
        #define HEX1 0x6f2c2077
        #define HEX2 0x6f726c64
        #define HEX3 0x210a0000
#endif
	
typedef union {
        char what[16];
        long cipher[4];
} mystery;
	
int main(void)
{
        mystery x;
	
        x.cipher[0] = HEX0;
        x.cipher[1] = HEX1;
        x.cipher[2] = HEX2;
        x.cipher[3] = HEX3;
	
        printf("%s", x.what);
        return 0;
}

Isn’t it a wonder?