我有
Main.cpp需要data.cpp和user.cpp。如何链接或编译它们？它们都在同一个目录中？（请更具体一点，比如先编译哪个文件。）
我的系统是：Mac OS X，g++编译器在终端。
最简单的方法：
g++ Data.cpp User.cpp main.cpp
更高级的方法：使用makefile
试试这个：
g++ main.cpp Data.cpp User.cpp -o myexecutable
所有源文件都是单独编译的，因此顺序并不重要。编译完成后，g++也会进行链接。
Compile each one seperately to object files. Then link the object files to an application.
我猜你说错话了：
Main.cpp是否不需要user.cpp：他只需要定义在user.cpp中实现的类型。这就是为什么您只需要在Main.cpp中包含user.h。
通常，每个.cpp文件都会变成自己的翻译单元，并提供不同的object文件。然后，当链接过程发生时，将组装这些文件。
基本上，步骤是：
.cpp), you generate an object file (compilation).通常，人们使用Makefile或更好的工具：SConstruct来自动化这些步骤。
SConstruct很好，因为它还在编译前解析源文件并构建依赖树，以确保一切顺利。
最快的方法是
g++ main.cpp Data.cpp User.cpp -o program_name
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