Question

While declaring all c++ pointer, all should by default be initilized to ZERO or NULL to avoid any random unwanted values. So that we can check if pointer is null that means not initilized.

thanks

Answer 1

In C++03, prefer ptr = 0 over ptr = NULL (Bjarne S. says that. Read the excerpt below quoted from his site)

In C++0x, ptr = nullptr (see this)

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Bjarne Stroustrup says that,

Should I use NULL or 0?

In C++, the definition of NULL is 0,
so there is only an aesthetic
difference. I prefer to avoid macros,
so I use 0. Another problem with NULL
is that people sometimes mistakenly
believe that it is different from 0
and/or not an integer. In pre-standard
code, NULL was/is sometimes defined to
something unsuitable and therefore
had/has to be avoided. That’s less
common these days.

If you have to name
the null pointer, call it nullptr;
that’s what it’s going to be called in
C++0x. Then, "nullptr" will be a
keyword.