How to Throw a Custom Exception in C++?

In C++, exception handling is done by throwing an exception in a try block and catching it in the catch block. We generally throw the built-in exceptions provided in the <exception> header but we can also create our own custom exceptions.

In this article, we will discuss how to throw a custom exception in C++.

Throwing Custom Exceptions in C++

To throw a custom exception, we first have to create a custom exception class. This class inherits the std::exception class from <exception> header. We override the what() method of this class to provide a custom error message.

The last step is to use this user-defined custom exception in our code. The below method demonstrates how to do it.

C++ Program to Throw a Custom Exception

Caught an exception: This is a custom exception

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