C / C++ / MFC

#define  CK_ISPOW2(n)        ( ((n)&((n)-1)) == 0 )
 
ullong  FkGrainDn2( ullong S, ullong G )
{
	// if( !CK_ISPOW2(G) )  return( FkGrainDnN(S, G) );
	S = S & ~(G-1);
	return(S);
}
 
ullong  FkGrainUp2( ullong S, ullong G )
{
	// if( !CK_ISPOW2(G) )  return( FkGrainUpN(S, G) );
	G -= 1;
	S  = (S+G) & ~G;
	return(S);
}

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

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Stephen Hewitt wrote:

now I suspect I was actually doing your homework.