Intel® Fortran Compiler Classic and Intel® Fortran Compiler Developer Guide and Reference

ID 767251
Date 7/13/2023
Public

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Document Table of Contents

Components of Data Transfer Statements

Data transfer statements take one of the following forms:

io-keyword (io-control-list) [io-list]

io-keywordformat [, io-list]

io-keyword

Is one of the following: ACCEPT, PRINT (or TYPE), READ, REWRITE, or WRITE.

io-control-list

Is one or more of the following input/output (I/O) control specifiers:

[UNIT=]io-unit

ASYNCHRONOUS

IOMSG

SIZE

[FMT=]format

END

IOSTAT

[NML=]group

EOR

POS

ADVANCE

ERR

REC

io-list

Is an I/O list, which can contain variables (except for assumed-size arrays) or implied-DO lists. Output statements can contain constants or expressions.

format

Is the nonkeyword form of a control-list format specifier (no FMT=).

If a format specifier ([FMT=]format) or namelist specifier ([NML=]group) is present, the data transfer statement is called a formatted I/O statement; otherwise, it is an unformatted I/O statement.

If a record specifier (REC=) is present, the data transfer statement is a direct-access I/O statement; otherwise, it is a sequential-access I/O statement.

If an error, end-of-record, or end-of-file condition occurs during data transfer, file positioning and execution are affected, and certain control-list specifiers (if present) become defined. (For more information, see Branch Specifiers.)

Following sections describe the I/O control list and I/O lists.