Answer Posted / c.p.senthil

function returns if the number is a power of 2. if number value is 1, 2, 4, 8, 16 ... then TRUE is returned.

f(1) => 1 & 0 => 0001 & 0000 => 0
f(2) => 2 & 1 => 0010 & 0001 => 0
f(3) => 3 & 2 => 0011 & 0010 => 1 (non zero) => return true
f(4) => 4 & 3 => 0100 & 0011 => 0
f(5) => 5 & 4 => 0101 & 0100 => 4 (non zero) => return true
f(6) => 6 & 5 => 0110 & 0101 => 4 (non zero) => return true
f(7) => 7 & 6 => 0111 & 0110 => 6 (non zero) => return true
f(8) => 8 & 7 => 1000 & 0111 => 0

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