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Shikhar Bhardwaj Feb 2 at 11:46 The book is: amazon.co.uk/Tour-C--Depth/dp/0321958314/??? ??? Andy Res Feb 2 at 11:48 2 Just to expand on these nice answers, you're confusing null pointers (what you're looping is actually checking for) and null terminators (what you want to check for, the character that terminates a C string). ??? nanny Feb 2 at 14:56 Thank you for pointing it out. ??? Andy Res Feb 2 at 15:01 I suggest you throw that book in the recycle bin, and curse all 'programmers' who suggest you write cutsie code like that. If you write the code so that the intended meaning is clear - "while (p != NULL)" it's pretty obvious that you're stepping the pointer p through all memory. Instead you want "while (*p != '\0')", checking for a null-terminated string * If x doesn't implement an __iadd__ method then the x += y statement is just a shorthand for x = x + y. 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which book is this??????????Shikhar Bhardwaj??Feb 2 at 11:46
???? ??
The book is:??amazon.co.uk/Tour-C--Depth/dp/0321958314/????????????Andy Res??Feb 2 at 11:48
2 ??
Just to expand on these nice answers, you're confusing??null pointers??(what you're looping is actually checking for) and??null terminators??(what you want to check for, the character that terminates a C string).???????nanny??Feb 2 at 14:56
????
Thank you for pointing it out.?????????Andy Res??Feb 2 at 15:01??
???? ??

I suggest you throw that book in the recycle bin, and curse all 'programmers' who suggest you write cutsie code like that. If you write the code so that the intended meaning is clear - "while (p != NULL)" it's pretty obvious that you're stepping the pointer p through all memory. Instead you want "while (*p != '\0')", checking for a null-terminated string

 

  • If??x??doesn't implement??an??__iadd__??method then the??x += y??statement is just a shorthand for??x = x + y. This would be the case if??x??was something like an??int.

  • If??__iadd__??returns??NotImplemented, Python falls back to??x = x + y.

  • The??__iadd__??method could theoretically be implemented to not work in place. It'd be really weird to do that, though.

 

 

Your code (while(p)) loops as long as p isn't zero. P is the pointer to the array, and you keep incrementing it and check memory past the array's bounds. That's the cause of the segmentation fault.

share improve this answer
answered??Feb 2 at 11:38
zmbq
20.8k 3 25 68
up vote2down vote

to my surprise it does not stop there, but it continues to cycle, which I suppose might be the cause of segmentation fault?

This happens because you are checking the pointer for??NULL, rather than checking what it points to for??'\0':

while(*p){

 

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