Error Handling Functions in C Explained — perror(), strerror(), ferror(), clearerr()

In this video, we explore the most important error-handling functions in C programming — perror(), strerror(), ferror(), and clearerr() — along with how to manage program exit states using EXIT_SUCCESS and EXIT_FAILURE.

These built-in functions help programmers detect, display, and recover from runtime errors gracefully — ensuring your C programs are more robust, readable, and professional.

👉 What You’ll Learn:

How to use perror() to print custom error messages with system error descriptions

How strerror() returns a string representation of an error code

How to check file operation errors with ferror()

How to clear error and EOF flags using clearerr()

Handling divide-by-zero errors safely with fprintf() and exit()

Using EXIT_SUCCESS and EXIT_FAILURE macros for clean program termination

Implementing error-handling patterns such as:

Function Split

Guard Clause

Samurai Principle

Goto Error Handling

Cleanup Record

Object-Based Error Handling

💻 Example Programs Included:

Printing detailed error messages using perror() and strerror()

Detecting file errors using ferror()

Resetting error indicators with clearerr()

Handling division by zero with safe exit control

💡 Key Takeaways:

perror() and strerror() simplify printing system-level error messages

ferror() and clearerr() ensure safe file I/O operations

Using proper error-handling patterns keeps your code clean, maintainable, and scalable

This tutorial is ideal for students, developers, and C programmers who want to understand real-world error handling in C.

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