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Consider this code: #include <stdio.h> int main(void) { static void *ptr; if(ptr == NULL) puts("It's NULL!"); } I wonder if this is guaranteed to print "It's NULL!" I know ...
#1: Initial revision
by
klutt
·
2022-02-10T00:48:14Z (about 2 years ago)
Are static pointers implicitly initialized to NULL?
Consider this code:
```
#include <stdio.h>
int main(void) {
static void *ptr;
if(ptr == NULL) puts("It's NULL!");
}
```
I wonder if this is guaranteed to print "It's NULL!"
I know that
1) Initializing or assigning a pointer to `0` is equivalent to initializing or assigning it to `NULL`
2) Static variables are initialized to zero unless explicitly initialized
3) `NULL` is not guaranteed to be a zero bit pattern, even though it's often is