ferror() in C

In C, ferror() is a built-in function used to check errors in files during file operations. It provides a simple way to do file operations without any interruption in your C program.

Syntax

ferror() is a standard library function defined in <stdio.h> file.

ferror(fptr)

Parameter:

• Take as a file stream in parameter.

Return Value:

• If the file has error, it returns a non-zero value.
• Otherwise, it returns 0.

Note: To check error in file using ferror(), file must be open before it.

Examples of ferror()

The following examples demonstrate the use of ferror() in C programs.

Check Error When Writing Data

Data written successfully.

Check Error When Read Data