cin的问题？？

[aspiregao]

近日在读侯捷的Essential C++,
对第一章的习题有些疑问？
请问如下代码怎样结束输入:

#include <vector>
#include <string>
using namespace std;

void ex1_xtra1()
{
vector< string* > sp_vec;
string st;

cout << "Please enter a series of strings\n";
while ( cin >> st ) //死循环??????
sp_vec.push_back( new string( st ));

vector<string*>::iterator
iter = sp_vec.begin(),
it_end = sp_vec.end();

cout << endl;
cout << "This is what you entered, no?\n";

for ( int items = 1; iter != it_end; ++items, ++iter ) {
if ( !( items % 8 ))
// print a newline every 8th item
cout << '\n';

// *iter returns a string*; (*(*iter)) yields string
cout << (*( *iter )) << ' ';
delete *iter;
}
cout << endl;
}

int main() {
ex1_xtra1();
return 0; // quiets vc++
}

另外，对
int i
cin<<i
若输入字符型数据，会导致该段代码下的其它cin无效，该如何解决？

[aspiregao]

怎么没人理我？？
老大，帮帮忙吧？

[梅雪香]

谁有时间看呐

[bugbugbug]

while ( cin >> st )
{
if(st=="end")break;
sp_vec.push_back( new string( st ));
}

[cream2001]

Ctrl+z来结束

[kinghawk]

cin<<i是什么意思？

[hz129]

ctrl+d

[aspiregao]

thank you!

[aspiregao]

thank you!