class Student{ private: int age, standard; string first_name, last_name; public: void set_age(int age_input){ age = age_input; return; } void set_standard(int standard_input){ standard = standard_input; return; } void set_first_name(string first_name_input){ first_name=first_name_input; } void set_last_name(string last_name_input){ last_name=last_name_input; } int get_age(){return age;} int get_standard(){return standard;} string get_first_name() {return first_name;} string get_last_name() {return last_name;} string to_string(){ return std::to_string(age) + "," + first_name + "," + last_name + "," + std::to_string(standard); }