// vec.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include <vector> #include <iostream> #include <fstream> #include <algorithm> //sort需要用到 //#include <numeric> using namespace std; int _tmain(int argc, _TCHAR* argv[]) { //vector<int> vi(10,5); //int i = vi.size(); //vi.push_back(i); //cout << i << endl; //cout << vi.size() << endl; //for(vector<int>::size_type st = 0; st < vi.size(); st++) // cout << vi[st] << " "; //for(vector<int>::iterator iter = vi.begin(); iter < vi.end(); iter++) // cout << *iter << " "; int num; vector<int> vi; fstream infile("input.txt"); while(!infile.eof()) { infile >> num; vi.push_back(num); } infile.close(); for(vector<int>::iterator iter = vi.begin();iter!=vi.end();iter++) cout << *iter << " "; cout << endl; sort(vi.begin(),vi.end()); for(vector<int>::iterator iter = vi.begin(); iter != vi.end(); iter++) cout << *iter << " "; fstream outfile; outfile.open("output.txt",iostream::out); //或者 //ofstream outfile; //outfile.open("output.txt"); for(vector<int>::iterator iter = vi.begin(); iter != vi.end(); iter++) outfile << *iter << " "; outfile << 1 << endl; outfile.close(); return 0; }

主要是output.txt建立部分的程式碼，如果在fstream建立outfile時不指明iostream::out，則不會建立檔案。

但如果是ofstream就不用指明。