int age;

string first_name;

string last_name;

int standard;

int get_age() {

return age;

}

void set_age(int a) {

age = a;

}

string get_first_name() {

return first_name;

}

void set_first_name(string name) {

first_name = name;

}

string get_last_name() {

return last_name;

}

void set_last_name(string name) {

last_name = name;

}

int get_standard() {

return standard;

}

void set_standard(int s) {

standard = s;

}

string to_string() {

return ::to_string(age) + "," + first_name + ',' + last_name + "," + ::to_string(standard);

}