how to use tostring method in c 2b 2b

1#include <string>
2
3struct Student {
4    std::string name;
5    int age;
6    double finalGrade;
7
8    std::string toString() {
9        return "Name: " + 
10            name + 
11            "\n Age: " + 
12            std::to_string(age) + 
13            "\n Final Grade: " + 
14            std::to_string(finalGrade);
15    }
16};
17