feof

Test for end of file

Syntax

status = feof(fileID)

Description

status = feof(fileID) returns a 1 if the end of the file specified by fileID was reached by a previous operation. Otherwise, feof returns a 0.

Examples

Read to End of File

From this badpoem.txt file, read one line at a time to the end of the file.

Use fopen to open the file. This function assigns a unique file id to use for reading and writing to the file.

fid = fopen('badpoem.txt');

Read and display one line at a time until you reach the end of the file.

while ~feof(fid)
    tline = fgetl(fid);
    disp(tline)
end

Oranges and lemons,
Pineapples and tea.
Orangutans and monkeys,
Dragonflys or fleas.

Close the file.

fclose(fid);

Input Arguments

fileID — File identifier

integer

File identifier of an open file, specified as an integer. Before testing for the end-of-file status, you must use fopen to open the file and obtain its identifier fileID.

Data Types: double

Tips

• Opening an empty file does not set the end-of-file indicator. Read operations, and other operations like fseek and frewind, move the file position indicator.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

Thread-Based Environment

Run code in the background using MATLAB® backgroundPool or accelerate code with Parallel Computing Toolbox™ ThreadPool.

This function fully supports thread-based environments. For more information, see Run MATLAB Functions in Thread-Based Environment.

Version History

Introduced before R2006a

R2024b: Read data over HTTP and HTTPS using low-level file functions

You can read data from primary online sources by performing low-level file read operations over an internet URL.

R2022b: Use function in thread-based environments

This function supports thread-based environments.