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

ID 767251
Date 11/07/2023
Public

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Document Table of Contents

ISATTY

Portability Function: Checks whether a logical unit number is a terminal.

Module

USE IFPORT

result = ISATTY (lunit)

iunit

(Input) INTEGER(4). An integer expression corresponding to a Fortran logical unit number. Must be in the range 0 to 100 and must be connected.

Results

The result type is LOGICAL(4). The result is .TRUE. if the specified logical unit is connected to a terminal device; otherwise, .FALSE..

If lunit is out of range or is not connected, zero is returned.