get i th bit:

num & (1 << i)

set i th bit to 1:

num | (1 << i)

clear i th bit to 0:

int mask = ~(1 << i)
num &= mask

clear right most 1

num &= num - 1

clear all bits from the most significant bit through i (inclusive)

int mask = (1 << i) - 1
num &= mask

clear all bits from i through 0 (inclusive)

int mask = ~(1 << i)
num = (num & mask) | (v << i)

update i th bit with the value in v

int mask = ~(1 << i)
num = (num & mask) | (v << i);