08 IO库

 #include<iostream>
 #include<vector>
 #include<string>
 #include<fstream>
 using namespace std;

 int main()
 {
     ifstream in("test.txt");
     if (!in)
     {
         cerr << "打开文件失败" << endl;
         exit();
     }

     vector<string> vec;
     string str;
     in >> str;
     while (getline(in, str))
         vec.push_back(str);

     for (auto c : vec)
         cout << c << endl;
     return ;
 }

#include<iostream>
#include<vector>
#include<string>
#include<fstream>
using namespace std;

int main()
{
    ifstream in("test.txt");
    if (!in)
    {
        cerr << "打开文件失败" << endl;
        exit();
    }

    vector<string> vec;
    string str;
    in >> str;
    while (getline(in, str))
        vec.push_back(str);

    for (auto c : vec)
        cout << c << endl;
    return ;
}

test.txt文件内容：

输出结果：