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~~In short, NULL is the 0 value, and a null pointer (void *) is a pointer variable that points to nothing.~~
> some systems allowing a different representation of the null pointer other than zero
Years back compilers implemented some things on their own, partly because the language standards weren't strictly defined and imposed. For instance, I remember using a compiler that handled ```random``` related implementations in a different manner than other compilers. So, while some compilers defined their own null pointer implementation, NULL was always 0.
> Can NULL be something other than zero?
No, I don't think so. However, you can tweak a compiler to replace instances of NULL with a value other than 0, but that wouldn't be a standard C compiler then.

In short, NULL is the 0 value, and a null pointer is a pointer variable that points to nothing.
> some systems allowing a different representation of the null pointer other than zero
Years back compilers implemented some things on their own, partly because the language standards weren't strictly defined and imposed. For instance, I remember using a compiler that handled ```random``` related implementations in a different manner than other compilers. So, while some compilers defined their own null pointer implementation, NULL was always 0.
> Can NULL be something other than zero?
No, I don't think so. However, you can tweak a compiler to replace instances of NULL with a value other than 0, but that wouldn't be a standard C compiler then.

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