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假设代码中已引入<iostream>和<string>头文件,且使用了using namespace std;,以下代码片段语法正确的是?
<iostream>
<string>
using namespace std;
struct Student { int id; string name; } Student s; s.id = 1001;
struct Student { int id; string name; }; Student *s = new Student; s.id = 1002;
struct Student { int id; string name; }; Student s = {1003, "张三"}; cout << s.name;
struct { int id; string name; } Student; Student s; s.id = 1004;