There are advantages for using files for I/O.

1. Reading data from input file is better than typing data in from the keyboard:
   
   
   • Instead of having to wait at the computer during program execution to enter the data, the data can be prepared in advance and checked for accuracy before running the program.
     
   • A large amount of data can be handled unattended using files.
     
     
2. Writing output data out to a file is better than sending the data to the screen:
   
   
   • The screen can only display a limited amount of information. One has to sit by the screen to see the information. The information is easily lost after it is displayed.
     
   • On the other hand, information can be written to a file unattended. A large amount of data can be handled. The information is stored permanently in the file until erased by the user.