# Variables and Types
## Metadata
- Author: [[cplusplus.com]]
- Full Title: Variables and Types
- Category: #articles
- Summary: In C++, variables are memory portions used to store values, and they must be declared with a specific type before use. The language supports various fundamental data types, like char, int, and float, which can vary in size and precision depending on the compiler. Additionally, C++ allows for different ways to initialize these variables, including using auto for type deduction.
- URL: https://cplusplus.com/doc/tutorial/variables/
## Highlights
- Here is the complete list of fundamental types in C++:
Group
Type names*
Notes on size / precision
Character types
`**char**`
Exactly one byte in size. At least 8 bits.
`**char16_t**`
Not smaller than `char`. At least 16 bits.
`**char32_t**`
Not smaller than `char16_t`. At least 32 bits.
`**wchar_t**`
Can represent the largest supported character set.
Integer types (signed)
`**signed char**`
Same size as `char`. At least 8 bits.
`*signed* **short** *int*`
Not smaller than `char`. At least 16 bits.
`*signed* **int**`
Not smaller than `short`. At least 16 bits.
`*signed* **long** *int*`
Not smaller than `int`. At least 32 bits.
`*signed* **long long** *int*`
Not smaller than `long`. At least 64 bits.
Integer types (unsigned)
`**unsigned char**`
(same size as their signed counterparts)
`**unsigned short** *int*`
`**unsigned** *int*`
`**unsigned long** *int*`
`**unsigned long long** *int*`
Floating-point types
`**float**`
`**double**`
Precision not less than `float`
`**long double**`
Precision not less than `double`
Boolean type
`**bool**`
Void type
`**void**`
no storage
Null pointer
`**decltype(nullptr)**` ([View Highlight](https://read.readwise.io/read/01jde5yhk236mkdj17717632aa))