C++ ofstream/ifstream讀寫檔案demo__C++

#include <iostream>#include <fstream>using namespace std;int main(){  //1.ofstream寫入out.txt  const char * filename = "test.txt";  string end= "123456";  ofstream out("out.txt");  if(out.is_open())  {    /*      "<<":插入器，向流輸出資料.      ">>":析取器，向流輸出資料.     */    out<<"Hello World." << filename  << " "<< end << endl;    out.close();  }  //2.讀取out.txt  ifstream in("out.txt");  char buffer[200];  if(in.is_open())  {    while(!in.eof())    {      in.getline(buffer, 100);      cout << buffer << endl;      out.close();    }  }}