odd?

/*
 *  call-seq:
 *     fix.odd? -> true or false
 *
 *  Returns <code>true</code> if <i>fix</i> is an odd number.
 */

static VALUE
fix_odd_p(VALUE num)
{
    if (num & 2) {
        return Qtrue;
    }
    return Qfalse;
}