C++ Keywords must be in your knowledge because you can not use them as a variable name. This tutorial describes various Keywords available in C++.
You can't use a keyword as an identifier in your C++ programs; it's reserved words in the C++ library and used to perform an internal operation. The meaning and working of these keywords are already known to the C++ compiler.
C++ Keywords List
asm
| else
| new
| this
|
auto
| enum
| operator
| throw
|
bool
| explicit
| private
| true
|
break
| export
| protected
| try
|
case
| extern
| public
| typedef
|
catch
| false
| register
| typeid
|
char
| float
| reinterpret_cast
| typename
|
class
| for
| return
| union
|
const
| friend
| short
| unsigned
|
const_cast
| goto
| signed
| using
|
continue
| if
| sizeof
| virtual
|
default
| inline
| static
| void
|
delete
| int
| static_cast
| volatile
|
do
| long
| struct
| wchar_t
|
double
| mutable
| switch
| while
|
dynamic_cast
| namespace
| template
|
In addition, the following words are also reserved:
And
| bitor
| not_eq
| xor
|
and_eq
| compl
| or
| xor_eq
|
bitand
| not
| or_eq
|
You should also try to avoid using names from the C++ library, e.g. swap, max.