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示例代码：

namesp.h

#include 
   
    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);}
   

namesp.cpp

#include 
   
    #include "namesp.h"namespace pers{  using std::cout;  using std::cin;  void getPerson(Person & rp)  {    cout << "Enter first name: ";    cin >> rp.fname;    cout << "Enter last name: ";    cin >> rp.lname;  }  void showPerson(const Person & rp)  {    std::cout << rp.lname << ", " << rp.fname;  }}namespace debts{  void getDebt(Debt& rd)  {    getPerson(rd.name);    std::cout << "Enter debt: ";    std::cin >> rd.amount;  }  void showDebt(const Debt & rd)  {    showPerson(rd.name);    std::cout << ": $" << rd.amount << std::endl;  }  double sumDebts(const Debt ar[], int n)  {    double total = 0;    for (int i =0; i < n; i++)      total += ar[i].amount;    return total;  }}
   

namessp.cpp

#include 
   
    #include "namesp.h"void other(void);void another(void);int main(void){  using debts::Debt;  using debts::showDebt;  Debt golf = {
  {"Benny", "Goatsniff"}, 120.0};  showDebt(golf);  other();  another();  return 0;}void other(void){  using std::cout;  using std::endl;  using namespace debts;  Person dg = {"Doodles", "Glister"};  showPerson(dg);  cout << endl;  Debt zippy[3];  int i;  for (i = 0; i < 3; i++)    getDebt(zippy[i]);  for (i = 0; i < 3; i++)    showDebt(zippy[i]);  cout << "Total debt: $" << sumDebts(zippy, 3) << endl;  return;}void another(void){  using pers::Person;  Person collector = {"Milo", "Rightshift"};  pers::showPerson(collector);  std::cout << std::endl;}
   

执行结果：

最后 总结：

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