Question

C++ vector进行文本文件读取

然后我要修改vector里面的每个元素，进行erase() insert()操作，再输出到文本。怎么

Answer 1

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
using namespace std;
int main()
{
vector<string> v,v2;
ifstream fin("a.txt");
ofstream fout("b.txt");
if(fin && fout){
string line;
while(getline(fin,line))v.push_back(line);
v2.assign(v.begin(),v.end());
vector<string>::iterator it;
for(it=v.begin();it!=v.end();)
{
cout<<*it<<endl;
it=v.erase(it);
}
for(it=v2.begin();it!=v2.end();++it)v.insert(v.begin(),*it);
cout<<"---------"<<endl;
for(it=v.begin();it!=v.end();++it){
cout<<*it<<endl;
fout<<*it<<endl;
}
}else{
cerr<<"can not open file"<<endl;
}
return 0;
}