zero?

/*
 *  call-seq:
 *     flt.zero? -> true or false
 *
 *  Returns <code>true</code> if <i>flt</i> is 0.0.
 *
 */

static VALUE
flo_zero_p(num)
    VALUE num;
{
    if (RFLOAT(num)->value == 0.0) {
        return Qtrue;
    }
    return Qfalse;
}