Files error codes

The default setting is to exit the program, if there is a "file error".
This can be: a file can't be opened, or read... However in most cases
you want a bit more control over this.

You can set the variable "_err_file" to "1" and switch on error handling.
Every file operation returns a code to the variable "_file".

The codes are defined in the "file.nah" include:
    code|   error
    ----+-------------------------
    0   |   no error
    1   |   open error
    2   |   close error
    3   |   read error
    4   |   write error
    5   |   wrong file number
    6   |   end of file
    7   |   wrong position in file
    
Prev: Files | Next: Memory