📄 bitrev_c.mht
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Date: Wed, 27 Sep 2006 22:45:31 +0800
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<BODY><PRE>/* bitrev.c - bit reverse of a B-bit integer n */
#define two(x) (1 << (x)) /* \(2\sp{x}\) by =
left-shifting */
int bitrev(n, B)
int n, B;
{
int m, r;
for (r=3D0, m=3DB-1; m>=3D0; m--)
if ((n >> m) =3D=3D 1) { /* if =
\(2\sp{m}\) term is present, then */
r +=3D two(B-1-m); /* add =
\(2\sp{B-1-m}\) to \(r\), and */
n -=3D two(m); /* subtract =
\(2\sp{m}\) from \(n\) */
}
return(r);
}
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