checking bit of an address

blackzone · 09-20-2004, 05:24 AM

how do I check if a bit in a data structure is set or not.

for example I have a 8 bit char

is there a direct function which let you check if bit 1 and bit 3 is set?

Proud · 09-20-2004, 05:31 AM

Masking, eg and the byte with 00001010 and check the result equals 00001010?

bahramH · 09-20-2004, 06:35 AM

To do binary "AND" (between respective bits of two chars
for example) use "&".

jwstric2 · 09-20-2004, 09:39 AM

#define CHECK_BIT(s, b) ((s[b/8] & (1 << ( b%8)))!= 0)