无法在同一个文件中使用模块和主程序进行编译 [英] Can't compile with module and main program in same file

问题描述

我正在尝试使用与我的主程序位于同一个文件中的模块。但是，我无法让它工作。 Fortran是否允许将模块包含在与主程序相同的文件中，或者它是否必须位于单独的文件中？这是我的代码的一个简单版本：

I am trying to make use of a module that is in the same file as my main program. However, I cannot get it to work. Does Fortran allow a module to be contained in the same file as the main program or must it be in a separate file? Here is a simple version of my code:

main program
  use my_module
  call my_subroutine()
end program main

module my_module
  contains
    subroutine my_subroutine()
      print *, "Hello World!"
    end subroutine my_subroutine
end module my_module

当我尝试编译这个文件我得到：

When I try to compile this file I get:

Fatal Error: Can't open module file 'my_module.mod' for reading at (1): No such file or directory

推荐答案

是的，Fortran确实允许模块为包含在与主程序相同的文件中。但是，必须在主程序之前编写模块：

Yes, Fortran does allow modules to be contained in the same file as the main program. However, modules must be written before the main program:

module my_module
  contains
    subroutine my_subroutine()
      print *, "Hello World!"
    end subroutine my_subroutine
end module my_module

program main
  use my_module
  call my_subroutine()
end program main

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