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C++ STL中set的一些用法

2008-08-07 09:12 603 查看

C++ STL中set的一些用法

#include <iostream>
#include <set>
#include<algorithm>
using namespace std;

int main()
{
int i;
char b[10];
for( i = 0; i < 10; i++ )b[i] = i+'a';
set<char>a(b,b+10);
set<char>::iterator p;
for( p = a.begin(); p != a.end(); p++ )
{
cout << *p << " ";
}
cout << endl << endl;
cout << "count('a') = " << a.count('a') << endl << endl;
set<char>c;
cout << "c.empty = " << c.empty() << endl << endl;

pair<set<char>::iterator, set<char>::iterator>s;

pair<set<char>::iterator,bool>d;
d = a.insert('e');
cout << "d.second = " << d.second << endl;
s = a.equal_range('e');

for( p = s.first; p != s.second; p++ )cout << *p << " ";
cout << endl;

a.erase('e');

for( p = a.begin(); p != a.end(); p++ )
{
cout << *p << " ";
}
cout << endl << endl;

p = a.find('c');
cout << *p << endl;

p = a.lower_bound('e');
for( ; p != a.end(); p++ )cout << *p << " ";
cout << endl << endl;
set<char>::reverse_iterator q;
for( q = a.rbegin(); q != a.rend(); q++ )cout << *q << " ";
cout << endl << endl;

set<char>r;
for( i = 0; i < 5; i++ )r.insert(i+'u');
for( p = r.begin(); p != r.end(); p++ )cout << *p << " ";
cout << endl << endl;

r.swap(a);

for( p = r.begin(); p != r.end(); p++ )cout << *p << " ";
cout << endl << endl;

for( p = a.begin(); p != a.end(); p++ )cout << *p << " ";
cout << endl << endl;

return 0;

}

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