> For the complete documentation index, see [llms.txt](https://docs.hex-rays.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hex-rays.com/9.0sp1/developer-guide/idc/core-concepts.md).

# Core concepts

IDC language is a C-like language. It has the same lexical tokens as C does: character set, constants, identifiers, keywords, etc. However, since it is a scripting language, there are no pointers, and all variable types can be handled by the interpreter. Any variable may hold any value; variables are declared without specifying their type;

auto myvar;

An IDC program consists of function declarations. By default, execution starts from a function named 'main'.

Select a topic to read:

* [Variables](/9.0sp1/developer-guide/idc/core-concepts/variables.md)
* [Functions](/9.0sp1/developer-guide/idc/core-concepts/functions.md)
* [Statements](/9.0sp1/developer-guide/idc/core-concepts/statements.md)
* [Expressions](/9.0sp1/developer-guide/idc/core-concepts/expressions.md)
* [Predefined symbols](/9.0sp1/developer-guide/idc/core-concepts/predefined-symbols.md)
* [Slices](/9.0sp1/developer-guide/idc/core-concepts/slices.md)
* [Exceptions](/9.0sp1/developer-guide/idc/core-concepts/exceptions.md)
* [Index of IDC functions](/9.0sp1/developer-guide/idc/idc-api-reference/alphabetical-list-of-idc-functions.md)
* [Index of debugger related IDC functions](/9.0sp1/developer-guide/idc/idc-api-reference/index-of-debugger-related-idc-functions.md)


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