Struct init with 0

Question

I have struct:

struct stek
{
char value;
struct stek *next; 
};

Why i can init this like this:

stek *p = 0;

What this mean? Why zero?

How would we know why you decided to init your pointer with 0? — SergeyA, Nov 09 '16 at 19:01
See: http://stackoverflow.com/questions/13816385/what-are-the-advantages-of-using-nullptr — P.P, Nov 09 '16 at 19:01
What do you know about pointers? What research have you done? — Fantastic Mr Fox, Nov 09 '16 at 19:11

smac89 · Accepted Answer · 2016-11-09T19:06:38.430

2

tldr; Because 0 is a valid memory address.

Since pointers point to memory locations, the expression is valid and p points to memory address 0

edited Nov 09 '16 at 19:06

answered Nov 09 '16 at 19:01

smac89

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score 1 · Answer 2 · answered Nov 09 '16 at 18:59

1

Here 0 means NULL. In prior C++11, 0 can be used as NULL which is pretty ambiguous sometimes. Currently C++ has nullptr which makes more sense.

Read more about difference between NULL and nullptr.

answered Nov 09 '16 at 18:59

Kaidul

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Struct init with 0

2 Answers2