why my program doesn't tell that the last charcter of the string array is a NULL?

Question

i think that every string array ends with a NULL charcter but in thiss program the statment of checking if the last charcter of the string array is not True

#include <stdlib.h>
#include <stdio.h>


int main() {

char hey[5]="hello";


if(hey[5] == NULL){
    puts("Yes the last charcter is a NULL ");
}

return 0;

}

and also if NULL is \0 why when i try if (NULL == "\0") the statement is always False ?

This question has been closed for the wrong reason! The problem is that the `hey` array is not long enough ("hello" requires an array of at least **six** elements). — Adrian Mole, Jun 27 '20 at 13:29
@AdrianMole it is closed for the *right* reason, i.e. it is a duplicate. — Antti Haapala -- Слава Україні, Jun 27 '20 at 13:32
@AnttiHaapala OK, now that I can see the list of **all** duplicates, I agree. On my first look, they weren't all there. — Adrian Mole, Jun 27 '20 at 13:34
@AdrianMole yes, because I hammered it and then edited the duplicates as my hammer privilege. — Antti Haapala -- Слава Україні, Jun 27 '20 at 13:35
@AdrianMole Thanks so much for the help i changed to 6 and it worked but why does hello array use six elements when it is 0 based — Oussema Nehdi, Jun 27 '20 at 13:37
@OussemaNehdi please read [this QA](https://stackoverflow.com/questions/16489272/why-char-s-5-doesnt-collect-value-correctly) that I marked this question as a duplicate of. — Antti Haapala -- Слава Україні, Jun 27 '20 at 13:39
`NULL == '\0'` is always true (1) and correct and whatnot. But you cannot portably use `c[i] == NULL`. — Antti Haapala -- Слава Україні, Jun 27 '20 at 13:47

0___________ · Accepted Answer · 2020-06-27T13:36:45.057

0

Your string is too short and the initialization copies only 5 chars. The hey[5] (6th element of the array) is past the array bounds and is not determined

char hey[]="hello";

if(hey[5] == '\0'  /* or simply 0 */){
    puts("Yes the last character is a nul terminator");
}

NULL is not a nul terminator.

edited Jun 27 '20 at 13:36

answered Jun 27 '20 at 13:24

0___________

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why my program doesn't tell that the last charcter of the string array is a NULL?

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