The PopCount command computes the number of bits in num that are equal to 1.

If num is negative, infinitely many bits are equal to 1, so the returned value is infinity.

This operation is often called popcount in other systems. The name stands for "population count".

$\mathrm{with}\left(\mathrm{Bits}\right)\:$

$\mathrm{bits}≔\left[1\,1\,0\,0\,0\,1\,0\,1\,0\,1\,1\,0\,1\,1\,1\right]$

$\mathrm{bits}≔\left[1\,1\,0\,0\,0\,1\,0\,1\,0\,1\,1\,0\,1\,1\,1\right]$

$\mathrm{num}≔\mathrm{Join}\left(\mathrm{bits}\right)$

$\mathrm{num}≔30371$

$\mathrm{PopCount}\left(\mathrm{num}\right)$

$9$

$\mathrm{add}\left(\mathrm{bits}\right)$

$9$

The Bits[PopCount] command was introduced in Maple 2025.

For more information on Maple 2025 changes, see Updates in Maple 2025.