# Basic Types ## Bool – logical values **Bool** is a logical data type that can be either `True` or `False`. ## Int – fixed-precision integers **Int** can contain integers, both negative and positive whole numbers (e.g. `-50`, `50`) up to a certain size which is limited by a fixed amount of memory, hence the term fixed-precision. GHC can hold values in the range of `(-2^63)` to `(2^63 - 1)` for **Int** types - going outside those ranges will yield unexpected results. ## Integer – arbitrary-precision integers **Integer** is the same as Int except it does not have a limit to the values it can hold. Performance-wise, it is better to use Int if we know our values will not go out of range, as most computers have built-in hardware for dealing with fixed-precision integers. ## Float – single-precision floating-point numbers **Float** can contain decimal numbers (e.g. `-1.5`, `6.23`, `50.0`) up to a certain precision which is limited by a fixed amount of memory. The term floating-point comes from this memory limitation, which limits the number of digits (precision) that can come after the decimal point based on the size of the number. ## Double – double-precision floating-point numbers **Double** is the same type as float, containing decimal numbers but with double the memory assigned for storage for increased precision. ## Char – single character **Char** is a type for characters – it can hold any Unicode character including control characters such as `'\n'` (a new line character) or `'\t'` (tab stop character). **Char** type values must be enclosed in single quotes `''`. ## String – strings of characters **Strings** simply hold a string of characters – they are in fact a type `[Char]` (a list of **Char** type values) in Haskell. Strings must be enclosed in double-quotes `""`, e.g. `"Haskell is great"`. --- # 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://haskell.hpmeducation.com/types-in-haskell/basic-types.md?ask= ``` 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.