1/*
2 * Copyright (c) 2021 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
17int Add(int e1, int e2)
18{
19    int result = e1 + e2;
20    if ((e1 >= 0 && e2 >= 0 && result < 0) || (e1 < 0 && e2 < 0 && result >= 0)) {
21        result = -1;
22    }
23    return result;
24}
25
26int Sub(int e1, int e2)
27{
28    int result = e1 - e2;
29    return result;
30}
31
32int Mul(int e1, int e2)
33{
34    int result = e1 * e2;
35    if (!e1) {
36        return 0;
37    }
38    if ((result / e1) != e2) {
39        result = -1;
40    }
41    return result;
42}
43
44int Div(int e1, int e2)
45{
46    if (!e2) {
47        return -1;
48    }
49
50    int result = e1 / e2;
51    return result;
52}
53