cpp/CPPlusV6/Chapter 9/namesp.h

// namesp.h
#include <string>
// create the pers and debts namespaces
namespace pers
{
    struct Person
    { 
        std::string fname;
        std::string lname;
     };
    void getPerson(Person &);
    void showPerson(const Person &);
}

namespace debts
{
    using namespace pers;
    struct Debt
    {
        Person name;
        double amount;
    };
    
    void getDebt(Debt &);
    void showDebt(const Debt &);
    double sumDebts(const Debt ar[], int n); 
}