目录

这个程序包含三部分：

namesp.h

namesp.cpp

namessp.cpp

运行结果：

 这个程序包含三部分：

namesp.h

namesp.cpp

namessp.cpp

namesp.h

  

   

    

     

    
    

     

      //namesp.h 
     
    
   

    

     

    
    

     

      #include<string>
     
    
   

    

     

    
    

     

      // 创造名称空间
     
    
   

    

     

    
    

     

      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

  

   

    

     

    
    

     

      // namesp.cpp -- namespaces
     
    
   

    

     

    
    

     

      #include<iostream>
     
    
   

    

     

    
    

     

      #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;
     
    
   

    

     

    
    

     

      	}
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      //头文件中已经using namespace pers;，所以showPerson可以用了
     
    
   

    

     

    
    

     

      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

  

   

    

     

    
    

     

      // namessp.cpp -- 使用名称空间
     
    
   

    

     

    
    

     

      #include<iostream>
     
    
   

    

     

    
    

     

      #include"namesp.h"
     
    
   

    

     

    
    

     

      void other(void);
     
    
   

    

     

    
    

     

      void another(void);
     
    
   

    

     

    
    

     

      int main(void)
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
	using debts::Debt;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	using debts::showDebt;
     
    
   

    

     

    
    

     

      	Debt golf = { { "Benny", "Goastsinff" }, 120.0 };//忘了可以查看Debt定义
     
    
   

    

     

    
    

     

      	showDebt(golf);
     
    
   

    

     

    
    

     

      	other();
     
    
   

    

     

    
    

     

      	another();
     
    
   

    

     

    
    

     
	return 0;
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      void other(void)
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     
	using std::cout;
     
    
   

    

     

    
    

     
	using std::endl;
     
    
   

    

     

    
    

     
	using namespace debts;
     
    
   

    

     

    
    

     

      	Person dg = { "Doodels", "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", "Rufsift" };
     
    
   

    

     

    
    

     

      	pers::showPerson(collector);
     
    
   

    

     

    
    

     
	std::cout << std::endl;
     
    
   

    

     

    
    

     

      }
     
    
  
 

运行结果：

9.3.3 

文章来源: kings.blog.csdn.net，作者：人工智能博士，版权归原作者所有，如需转载，请联系作者。

原文链接：kings.blog.csdn.net/article/details/97239307