.TH ZBTEST 3 libzahl
.SH NAME
zbtest - Test a bit in a big integer
.SH SYNOPSIS
.nf
#include <zahl.h>

int zbtest(z_t \fIa\fP, size_t \fIindex\fP);
.fi
.SH DESCRIPTION
.B zbtest
returns whether the bit with the specified
.I index
is set in
.IR a .
.SH RETURN VALUE
.B zbtest
returns 1 if the bit is set, or 0 otherwise.
.SH SEE ALSO
.BR zbset (3),
.BR zand (3),
.BR zor (3),
.BR zxor (3),
.BR znot (3),
.BR zlsh (3),
.BR zrsh (3),
.BR zsplit (3),
.BR zlsb (3),
.BR zbits (3)