Help with determining bit values

[knik653]

Hello,
I am reading 5 words from memory and then trying to determine bit values within each of the words.

I am given the location of the bit positions in hex, so can I bitwise operator "and" the word and the hex value to determine the value of the bit position?

For example:

is_bit_set = word_read_from_mem & 0x00000001;
is_bit_set = word_read_from_mem & 0x00080000;

Thanks.

[laserlight]

It sounds like you answered your own question

[wrvc]

int i = 0b1101101;
printf("%d\n",  (i & (1 << 4))  );

this prints ' 0 ' because the fourth bit from the left is 0.

[laserlight]

int i = 0b1101101;
printf("%d\n",  (i & (1 << 4))  );

this prints ' 0 ' because the fourth bit from the left is 0.

... assuming that a language extension is enabled allowing 0b1101101 to be a valid constant rather than a syntax error.

[wrvc]

... assuming that a language extension is enabled allowing 0b1101101 to be a valid constant rather than a syntax error.

why would someone not use gcc?

[laserlight]

why would someone not use gcc?

Because gcc is not the only C compiler available: if you wish to discuss the merits or lack thereof of various C compilers vis-a-vis gcc, start a new topic. knik653 did not state any particular compiler, so it is not right to provide non-standard code without noting the fact.

[wrvc]

Because gcc is not the only C compiler available: if you wish to discuss the merits or lack thereof of various C compilers vis-a-vis gcc, start a new topic. knik653 did not state any particular compiler, so it is not right to provide non-standard code without noting the fact.

OK but you should still not the binary literal was just a visual example