C reserved keywords

The table below lists all keywords reserved by the C language. When the current programming language is C or C++, these keywords cannot be abbreviated, used as variable names, or used as any other type of identifiers.

`auto`	`else`	`long`	`switch`
`break`	`enum`	`register`	`typedef`
`case`	`extern`	`return`	`union`
`char`	`float`	`short`	`unsigned`
`const`	`for`	`signed`	`void`
`continue`	`goto`	`sizeof`	`volatile`
`default`	`if`	`static`	`while`
`do`	`int`	`struct`	`_Packed`
`double`