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[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
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