## 2.1 Constants

### nullptr

The purpose of `nullptr` appears to replace `NULL`. In a sense, 
traditional C++ treats `NULL` and `0` as the same thing, 
depending on how the compiler defines NULL, 
and some compilers define NULL as `((void*)0)` Some will define it directly as `0`.

C++ ** does not allow ** to implicitly convert `void *` to other types. 
But if the compiler tries to define `NULL` as `((void*)0)`, then in the following code:

## 2.1 Constants

### nullptr

The purpose of `nullptr` appears to replace `NULL`. In a sense, 
traditional C++ treats `NULL` and `0` as the same thing, 
depending on how the compiler defines NULL, 
and some compilers define NULL as `((void*)0)` Some will define it directly as `0`.

C++ **does not allow** to implicitly convert `void *` to other types. 
But if the compiler tries to define `NULL` as `((void*)0)`, then in the following code: