thank you in advance for this basic question.
I am going through a tutorial and I see this line.
int a = (n & 8) / 8
This is supposed to identify whether the fourth bit from the right is a binary representation of 0 or 1. I understand the concept of bits etc, but I do not understand what mathematical equation (if any) this represents.
Would anyone care to explain how this would be written in a mathematical equation? Also, please let me know if i am missing anything else in my understanding of this line. Thank you.
The expression ( n & 8 ) does Logical And of n with 1000 binary.
So that gets the 4th bit from right.
then dividing that by 8, shifts the value right 3 binary places. I.e. it moves the 4th bit to the rightmost place.
That is more clearly expressed as " >> 3"
So your overall expression would be something like:
(n AND 1000 ) >> 3
And that leaves the 4th bit of N in a temporary variable, as bit 0 (rightmost bit). All the other bits will be zero because of the AND.
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