1/*
2 * Copyright (c) 2023 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16#include <iostream>
17
18static const uint32_t ip_idx = 1;
19
20using namespace std;
21
22namespace {
23uint32_t fact(uint32_t ip)
24{
25    if (ip == ip_idx) {
26        return ip;
27    } else {
28        return ip * fact(ip - ip_idx);
29    }
30}
31}  // namespace