What do (n&(n-1))==0 and n&(n-1)==0 do in C++?

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 0  2029

What do (n&(n-1))==0 and n&(n-1)==0 do (n is an integer) in C++?

if ((n&(n-1))==0)
{
    // do something
}

if


                      
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