divmod

/*
 *  call-seq:
 *     flt.divmod(numeric)    => array
 *
 *  See <code>Numeric#divmod</code>.
 */

static VALUE
flo_divmod(x, y)
    VALUE x, y;
{
    double fy, div, mod, val;
    volatile VALUE a, b;

    switch (TYPE(y)) {
      case T_FIXNUM:
        fy = (double)FIX2LONG(y);
        break;
      case T_BIGNUM:
        fy = rb_big2dbl(y);
        break;
      case T_FLOAT:
        fy = RFLOAT(y)->value;
        break;
      default:
        return rb_num_coerce_bin(x, y);
    }
    flodivmod(RFLOAT(x)->value, fy, &div, &mod);
    if (FIXABLE(div)) {
        val = round(div);
        a = LONG2FIX(val);
    }
    else {
        a = rb_dbl2big(div);
    }
    b = rb_float_new(mod);
    return rb_assoc_new(a, b);
}