Question

I am reading ‘generic programming and the stl’

in chapter1, this is a sample like this,

int main()
{
    vector<string> v;
    string tmp;

    while(getline(cin,tmp))  //problem is here, it keep asking me to input value
        v.push_back(tmp);

    sort(v.begin(), v.end());
    copy(v.begin(), v.end(), ostream_iterator<string>(cout,"\n"));

    return 0;
 }

how do I get out of the while, it keep asking me to input value, no ending….

Answer 1

Send an end-of-file character: you can use CTRL-Z Return (Windows), or CTRL-D (Unix terminals). Then, getline will return false as there is nothing more to read from stdin.

An alternative is: pipe the output of another program into this one.