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+.TH ZBITS 3 libzahl
+.SH NAME
+zbits - Count used bits in a big integer
+.SH SYNOPSIS
+.nf
+#include <zahl.h>
+
+size_t zbits(z_t \fIa\fP);
+.fi
+.SH DESCRIPTION
+.B zbits
+calculates the bit-size of
+.IR a .
+If
+.I a
+is zero the bit-size is 1.
+.SH RETURN VALUE
+.B zbits
+returns the number of bits requires
+to represent
+.I a
+\(em 1 plus the floored binary logarithm of the
+absolute value of
+.I a
+\(em or 1 if
+.I a
+is zero.
+.SH SEE ALSO
+.BR zlsb (3),
+.BR zzero (3)