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
16var a = 2;
17print(a != null);
18print(null != a);
19print(a != undefined);
20print(undefined != a);
21
22var b = null;
23print(b != null);
24print(null != b);
25print(b != undefined);
26print(undefined != b);
27
28var c = undefined;
29print(c != null);
30print(null != c);
31print(c != undefined);
32print(undefined != c);
33
34var d = 2;
35print(d !== null);
36print(null !== d);
37print(d !== undefined);
38print(undefined !== d);
39
40var e = null;
41print(e !== null);
42print(null !== e);
43print(e !== undefined);
44print(undefined !== e);
45
46var f = undefined;
47print(f !== null);
48print(null !== f);
49print(f !== undefined);
50print(undefined !== f);