c++ namespace

namespace 예제입니다.

#include<iostream>
using namespace std;

namespace firstNS
{
 class demo{
  int i;
 public:
  demo(int _i){
   i = _i;
  };
  ~demo(){};
  int geti(){
   return i;
  }
  void seti(int _i){
   i = _i;
  }
 };
 char str[]="illustracting namespace\n";
 int counter;
}
namespace secondNS
{
 int x, y;
}

int main(){
 //using namesapce firstNS;
 firstNS::demo ob(10); 

 cout << "value of ob is : " << ob.geti() << endl;
 
 ob.seti(99);
 cout << "value of ob is : " << ob.geti() << endl;

 //using firstNS::str;
 cout << firstNS::str;

 using namespace firstNS;

 for(counter = 10; counter; counter--)
  cout << counter << endl;

 secondNS::x = 10;
 secondNS::y = 20;

 cout << "x, y: " << secondNS::x << "," << secondNS::y << endl;

 using namespace secondNS;

 demo xob(x), yob(y);
 
 cout << "xob, yob:" << xob.geti() << "," << yob.geti() << endl;
 return 0;
}