XCode can't open file (ifstream/ofstream) in C++ (XCode C++无法读写文件)

最近用XCODE读写不了文件，以下是解决方案，亲测可行：

Put your .txt files in the same directory where your main.cpp file is (or anywhere you like).

In Xcode go to Product > Scheme > Edit Scheme > Run test (on the right) > Options (middle top)

Down under Options check “Use custom working directory” and set it to the directory where you .txt files are located.

To work with the files, you will have to specify just file names, e.g. in_file.open("inputFile.txt"); no path is necessary.

原文：http://stackoverflow.com/questions/23438393/new-to-xcode-cant-open-files-in-c