c++读写txt文档

#include <iostream>#include <fstream>#include <string>#include <cassert>using namespace std;int main(){int  i=666;ofstream out("a.txt");if(out.is_open()){out<<"gaoxudong"<<endl;out<<"lihail"<<endl;out<<i<<endl;////结果: 在a.txt中写入：   //gaoxudong//lihail//666}out.close();char buffer[256];  ifstream in("a.txt");  if (! in.is_open())  {cout << "Error opening file";return -1; }  while (!in.eof() ) //如果读文件到达文件末尾，返回true。 {  in.getline (buffer,100);  cout << buffer << endl;  }  in.close(); return 0;}