Help with bit vector and setting its bits? Post: 302625485

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Top Forums Programming Help with bit vector and setting its bits? Post 302625485 by bjhum33 on Tuesday 17th of April 2012 09:18:12 PM

04-17-2012

Registered User

Help with bit vector and setting its bits?

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 and see if the bit is 0 and if it is i want to set it to one but either my check or set of the bit isnt wokring. if anyone would please tell me what im doing wrong i would appreciate it.

bjhum33

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LEARN ABOUT OPENDARWIN

ustrtok

ustrtok(3alleg4)						  Allegro manual						  ustrtok(3alleg4)

NAME

       ustrtok - Retrieves tokens from a string. Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       char *ustrtok(char *s, const char *set);

DESCRIPTION

       This  function  retrieves  tokens  from	`s'  which  are  delimited by characters from `set'. To initiate the search, pass the string to be
       searched as `s'.  For the remaining tokens, pass NULL instead. Warning: Since ustrtok alters the string it is parsing,  you  should  always
       copy  the  string  to  a temporary buffer before parsing it. Also, this function is not re-entrant (ie. you cannot parse two strings at the
       same time). Example:

	  char *word;
	  char string[]="some-words with dashes";
	  char *temp = ustrdup(string);
	  word = ustrtok(temp, " -");
	  while (word) {
	     allegro_message("Found `%s'
", word);
	     word = ustrtok(NULL, " -");
	  }
	  free(temp);

RETURN VALUE

       Returns a pointer to the token, or NULL if no more are found.

SEE ALSO

       uconvert(3alleg4), ustrchr(3alleg4), ustrrchr(3alleg4), ustrstr(3alleg4), ustrpbrk(3alleg4), ustrtok_r(3alleg4),  allegro_message(3alleg4),
       ustrncpy(3alleg4), exgui(3alleg4)

Allegro 							   version 4.4.2						  ustrtok(3alleg4)