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+.TH ZZERO 3 libzahl
+.SH NAME
+zzero - Check whether a big integer is zero
+.SH SYNOPSIS
+.nf
+#include <zahl.h>
+
+int zzero(z_t \fIa\fP);
+.fi
+.SH DESCRIPTION
+.B zzero
+checks whether
+.I a
+is zero.
+.SH RETURN VALUE
+.B zzero
+returns 1 if
+.I a
+is zero, and 0 otherwise.
+.SH SEE ALSO
+.BR zsignum (3),
+.BR zeven (3),
+.BR zodd (3),
+.BR zcmp (3)