实现一个学生类,包含学号(id),姓名(name),年级(grade)数据成员。为了输入输出的方便,需要对这个学生类重载“>>”和“<<”运算符,同时为了对多个学生按照学号从小到大排序,还需要重载“<”运算符,以使用STL里的sort函数。类的声明与主函数的测试代码已给出,请将类的实现与相关重载补充完整,使得程序正确运行并输出正确结果。
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
using namespace std;
class Student
{
public:
int id;
string name, grade;
Student()
{
id = -1;
name = '\0';
grade = '\0';
}
Student(int id, string name, string grade)
{
this->id = id;
this->name = name;
this->grade = grade;
}
bool operator < (const Student& s) const
{
if (s.id > this->id)
return true;
else
return false;
}
};
istream& operator >> (istream& in, Student& s)
{
in >> s.id;
in >> s.name;
in >> s.grade;
return in;
}
ostream& operator << (ostream& out, Student& s)
{
out << s.id << " " << s.name << " " << s.grade << endl;
return out;
}
/*请在这里填充代码*/
int main()
{
vector<Student> sv;
Student temp;
for(int i=0;i<3;i++){
cin >> temp;
sv.push_back(temp);
}
sort(sv.begin(), sv.end());
for (int i = 0; i < sv.size(); ++i)
cout << sv[i];
return 0;
}