Input / Output

Fortran 90 has a wealth of I/O, too much to cover here.

Fortran 90 allows a number of different streams (files) to be connected to a program for both reading and writing.

In Fortran 90 a file is connected to a logical unit denoted by a number. Each unit can have many properties, for example,

• file -- the name of the file connected to the unit,
• action -- read, write, read and write, etc.
• status -- old, new, replace, etc.
• access method -- sequential, direct,