Fortran I/O

In Fortran's I/O system, data is stored and transferred among files. All I/O data sources and destinations are considered files.

Devices such as the screen, keyboard, and printer are external files, as are data files stored on a device such as a disk.

Variables in memory can also act as a file on a disk and are typically used to convert ASCII representations of numbers to binary form. When variables are used in this way, they are called internal files.

For more information, see the individual topics in this section.

• Logical Devices
  
• Physical Devices (Windows*)
  
• Types of I/O Statements
  
• Forms of I/O Statements
  
• Assigning Files to Logical Units
  
• File Organization
  
• Internal Files and Scratch Files
  
• File Access and File Structure
  
• File Records
  
• Record Types
  
• Record Length
  
• Record Access
  
• Record Transfer
  
• Specifying Default Pathnames and File Names
  
• Opening Files: OPEN Statement
  
• Obtaining File Information: INQUIRE Statement
  
• Closing Files: CLOSE Statement
  
• Record I/O Statement Specifiers
  
• File Sharing (Linux* and OS X*)
  
• Specifying the Initial Record Position
  
• Advancing and Nonadvancing Record I/O
  
• User-Supplied OPEN Procedures: USEROPEN Specifier
  
• Microsoft Fortran PowerStation Compatible Files (Windows*)
  
• Using Asynchronous I/O