c – 代码在g中运行完美但在Xcode中运行不正确 – 无法找到文件

#include <iostream>
#include <fstream>
#include <String>
using namespace std;

int main () {
  String line;
  ifstream myfile ("example.txt");
  if (myfile.is_open())
  {
    while ( myfile.good() )
    {
      getline (myfile,linE);
      cout << line << endl;
    }
    myfile.close();
  }

  else cout << "Unable to open file"; 

  return 0;
}