What is the initial value of a point in c ?

Texture* texture;

what is the value of this pointer, is it nullptr is it NULL? I heard somwhere that the operating system might choose this is that true and is it safe to declare a pointer like this?

CodePudding user response：

The C language does not specify any initial value for a pointer, leaving it uninitialized could lead to undefined behavior. Some compilers will have a debug mode where a pointer will be initialized to a value that is likely to lead to a crash.

CodePudding user response：

Depends on where it is allocated. If static then 0. Ie like this

#include <stdio.h>
....
Texture* texture; // all statics are initialized to 0

On the stack, like this

int pooble(){
     Texture* texture;
    ...
}

then its value is undefined. Using it results in Undefeined Behaviour

function local statics are also initialized to 0

int pooble(){
     static Texture* texture; // =0
    ...
}