firstset.cpp

不错书对C++/C程序员很有用的大家不要错过.

//  If you use Visual C++, set the compile options to /GX
#ifdef __BCPLUSPLUS__
#include <iostream.h>
#include <set.h>
#else
#include <iostream>
#include <set>
#endif

using namespace std;
typedef set<int> SET_INT;

void main(void)
 {
   SET_INT s1;
   SET_INT s2;
   SET_INT::iterator i;
   cout << "s1.insert(5)" << endl;
   s1.insert(5);
   cout << "s1.insert(10)" << endl;
   s1.insert(10);
   cout << "s1.insert(15)" << endl;
   s1.insert(15);
   cout << "s2.insert(2)" << endl;
   s2.insert(2);
   cout << "s2.insert(4)" << endl;
   s2.insert(4);

  cout << "swap(s1,s2)" << endl;
  swap(s1,s2);

  // Displays: 2,4
  for (i=s1.begin();i!=s1.end();i++)
     cout << "s1 has " << *i << " in its set." << endl;

  // Displays: 5,10,15
  for (i=s2.begin();i!=s2.end();i++)
     cout << "s2 has " << *i << " in its set." << endl;

  cout << "s1.swap(s2)" << endl;
  s1.swap(s2);

  // Displays: 5,10,15
  for (i=s1.begin();i!=s1.end();i++)
     cout << "s1 has " << *i << " in its set." << endl;

  // Displays: 2,4
  for (i=s2.begin();i!=s2.end();i++)
     cout << "s2 has " << *i << " in its set." << endl;
}