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Help with bit vector and setting its bits?

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linux-howto

http://www.unix.com – Code: void shuffle (card_t cards[], card_t cards2[], char *bitvec) { int i; unsigned char temp, r; srand(time(NULL)); for (i = 0; i < 52; i++) { r = rand() % 52; temp = bitvec[r/8]; if (!(temp & (1 << (8- (r % 8))))) { temp |= (1 << (8- (r % 8)));------->is this my problem? } } } ok so I am trying to use a bit vector to keep track of some random numbers and I suppose I just dont understand how to use bit operations verry well since i thought that this code would work but from the results i have been getting the bit just stays 0 no matter what. So i want to check (HowTos)