value : An unsigned integer on 32 bits.
pos : which is the index of the bit to get from value. ( The index 0 is the first bit so the lowest value )
I want to implement a function get_bit(value,pos) so that it retruns the value of the bit (0 or 1) from the unsigned integer value at index pos
for example value = 5 (0101 in binary) then
get_bit(5,0)=1 get_bit(5,1)=0 get_bit(5,2)=1
Can you explain me what is the most optimized way to solve this problem ?
You can achieve it with
(value >> pos) & 0x01; (value >> pos) // Shift the value pos positions to the right & 0x01; // Only take the first bit (lowest value)
I recommend researching "bit shift" (the
>>) and "bit mask" (the
&) for example here to get a better understanding about the subject.