1 //vector类 resemble array 自动扩容... 暂存于内存中 2 //格式 vector<类（型）名> 对象名 example: vector<string> v; vector<int> i; 3 //copy a entire file into a vector of string 4 #include<fstream> 5 #include<string> 6 #include<iostream> 7 #include<vector> 8 using namespace std; 9 int main() 10 { 11 vector<string> v; 12 string s; 13 ofstream out("file.txt"); 14 for (int i = 0; i < 3; i++) 15 { 16 cout << "Please enter:" << endl; 17 getline(cin, s); 18 out << s << ' '; 19 } 20 out.close(); 21 ifstream in("file.txt"); 22 while (getline(in, s))//按行读取 23 v.push_back(s); //将string s压入vector v的尾部 24 for (int i = 0; i < v.size(); i++) 25 cout <<i<<":"<< v[i] << endl; 26 for (int i = 0; i < v.size(); i++) 27 v[i] += "!";//可以根据下标改变单元的值 28 for (int i = 0; i < v.size(); i++) 29 cout << i << ":" << v[i] << endl; 30 system("pause"); 31 return 0; 32 }