perror() in C

In C, perror() is a built-in function used to display a custom text description of the error code, which is stored in the system variable errno.

Example:

Output

An error occurred: No such file or directory

Syntax

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

perror("message");

This function does not return any value.

Examples of perror()

The following examples demonstrate the use of perror() in our C programs:

Handle Memory Allocation Error

Output

Memory allocation failed: Cannot allocate memory

Handle Insufficient Permission Error

Output

Error creating file: Permission denied