essential c++ source code part 1

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#include <iostream>#include <fstream>#include <iterator>#include <algorithm>#include <vector>#include <string>using namespace std;int main(){    ifstream in_file("a.txt");    ofstream out_file("b.txt");    if (!in_file || !out_file) {        cout << "unable to open file" << endl;        return -1;    }    istream_iterator<string> is(in_file);    istream_iterator<string> eof;    vector<string> text;    copy(is, eof, back_inserter(text));    sort(text.begin(), text.end());    ostream_iterator<string> os(out_file, " ");    copy(text.begin(), text.end(), os);}

 

essential c++ source code part 1