Question: c modify code without condensing into one file to get...

c++ modify code without condensing into one file to get string to work

#include <iostream>
#include <string>
#include "people.h"
using namespace std;
/* classes */

int main()
{

   Person p1;

   p1.set_age(31);
   p1.set_name("bob");

   cout << "my age is " << p1.get_age() << endl;
   cout << "my name is " << p1.get_name();
   return 0;
}

----------------------------------------people.h

#ifndef PEOPLE_H_INCLUDED
#define PEOPLE_H_INCLUDED

class Person
{
private :
   int age;
   string name;
public :
   void set_age(int);
   int get_age();
   void set_name(string);
   string get_name();
};

#endif // PEOPLE_H_INCLUDED

--------------------------------->people.cpp

#include "people.h"
#include <iostream>
#include <string>

using namespace std;

void Person ::set_age(int value)
{
   age = value;
}

int Person::get_age()
{
   return age;
}

void Person::set_name(string info)
{
   name = info;
}

string Person::get_name()
{
   return name;
}