# Exceptions

Any runtime error generates an exception. Exceptions terminate the execution. It is possible to catch an exception instead of terminating the execution:

```
    auto e;
    try
    {
      ... some statements that cause a runtime error...
    }
    catch ( e )
    {
      // e holds the exception information
      // it is an instance of the exception class
    }
```

See the details of [classes](/9.0/developer-guide/idc/core-concepts/classes.md).

The try/catch blocks can be nested. If the current function has no try/catch blocks, the calling function will be examined, and so on, until we find a try/catch block or exit the main function. If no try/catch block is found, an unhandled exception is reported.

It is also possible to throw an exception explicitly. Any object can be thrown. For example:

```
    throw 5;
```

will throw value '5'.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.hex-rays.com/9.0/developer-guide/idc/core-concepts/exceptions.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.