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====== C - C++ Variables ======

^Type^Example^Usage^Comment^
|int|1|<nowiki>[<signed | unsigned>] [<short | long | long long>] int</nowiki>| |
|long int|1L| |
|long long int|1LL| |
|double|1.0|<nowiki>[long] double</nowiki>| |
|float|1.0F| |
|char|'1'|<nowiki>[<signed | unsigned >]char</nowiki>| |
|char*|"a string"|Automatically terminated with a null character.|
|wchar_t*|L"a string"|<nowiki>[<signed | unsigned >]wchar_t</nowiki>| |
|char8_t*|u8"this is a UTF-8 string with a UTF-8 character: u2018"| |
|char16_t*|u"this is a UTF-16 string with a UTF-16 character: u2018"| |
|char32_t*|U"this is a UTF-32 string with a UTF-32 character: U00002018"| |
|bool|true, false| |
|binary|0b101|C++ 2014 standard.|

----

===== Declarations =====

Declarations use both intrinsic and user-defined types. The intrinsic types are:

<code c++>
[<signed | unsigned >]char
[<signed | unsigned >]wchar_t
[<signed | unsigned>] [<short | long | long long>] int
float
[long] double
bool
</code>

----

The keyword **auto** can be used if C++ can determine the type of variable itself:

<code>
auto var = 1L;               // The type of var is long int.
</code>

----

The keyword **decltype** extracts the type of an expression.

This type can then be used wherever a type name is used.

For example, the following example uses decltype to declare a second variable with same type as an existing variable:

<code>
decltype(var1) var2;         // The type of var2 is the same as var1.
</code>