// [lsb: 0-th bit, msb: n-th bit,]

//Get j-th bit:
(a & (1 << j)) != 0

//Set j-th bit:
a |= (1 << j)

//Clear j-th bit:
a &= ~(1 << j)

//Toggle j-th bit:
a ^= (1 << j)

//Get value of first set bit:
(a & -a)

//Turn on all bits:
a = -1

//Turn on first n bits:
a = (1 << n) - 1