[Thinking in C++]CH02:Ex06 解答

Problem:Change Fillvector.cpp so that it concatenates all the elements in the vector into a single string before printing it out, but don’t try to add line numbering.

问题：修改Fillvector.cpp，使其在打印出vector内全部元素前，将其全部元素合并为一个字串，但是不需要给每行编号。

//: C02:Fillvector.cpp
// Copy an entire file into a vector of string
#include<string>
#include<iostream>
#include<fstream>
#include<vector>
using namespace std;
void main(){
 vector<string>v;
 vector<string>u;
 ifstream in("2.txt");
 string line;
 string s;
 while(getline(in,line))
  v.push_back(line); // Add the line to the end
 for(int i=0;i<v.size();i++)
  s+=v[i];
 cout<<s<<endl;
} ///:~