i was working on this code, this what i come to. now i dont get anymore error while compiling, but the program stopes when it comes to this line:
printf("navn: %s\n",p->getNavn(p));
have i wright the rest wright..??
|Select|Wrap|Line Numbers Contributor New Member
thank you very much newb16..
now it is working.. and i am sorry again for the mistakes.. Navn suppose to be name..
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Incompatible pointer types even though they are both char*?
Can someone please explain why these char* are incompatible?
(First forum post so please excuse and educate me on any bad etiquette.)
Welcome to the forum, in fact both variables are different. One, the variable that refers to the strcmp function must be one of the type char *, which previously in the course is known as a string, the one you are passing is of type char **, although you do not write it that way but as char * [46]. This type of variables, as you define it, declares an array of pointers (46 in particular), it is pointers to pointers, I do not know if it is what you want, but you will not be able to use them with the strcmp function in this way .
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“assignment from incompatible pointer type [enabled by default]”?
I’m fairly new to C and trying to write a function that inserts a node at the beginning of the list, using these two structs:
My function is
When I compile I get the warning “assignment from incompatible pointer type [enabled by default]” for the last 3 lines so obviously there’s something I’m missing.
November 24, 2023 at 12:05 am
The warning “assignment from incompatible pointer type” occurs because there is a mismatch in pointer types in the last 3 lines of the function.
In the sin_list struct, the “first” and “last” members are declared as pointers to structs of type “node”. However, in the function, they are being assigned with “newnode” which is declared as a pointer to struct “singly_linked_list_node” (i.e., node). This causes the pointer type mismatch.
To fix this issue, you need to remove the struct keyword from the assignment statements in the function:
You should also ensure that you have included the necessary header files at the beginning of your code:
Additionally, there is an error when allocating memory for the “data” member of the newnode. Instead of sizeof(length) , it should be length to allocate the correct amount of memory for the string. You can modify the line to:
These changes should resolve the warning and ensure proper functionality of your insert_at_start function.
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assignment from incompatible pointer type
I have set up the following struct:
... and then I have defined:
where thread_arr is thread_node_t *thread_arr = NULL;
I don't understand why the compiler is complaining. Maybe I'm misunderstanding something.
2 Answers 2
Shouldn't struct thread_node_t *next; be struct _thread_node_t *next;
Also, do away with the explicit cast.
- OMG! Yeah... thanks. I can't believe I missed that. I had a struct like this working in a previous program and I was killing myself because I couldn't figure it out. Thanks a bunch. – Hristo Commented Apr 21, 2010 at 14:52
- About the explicit cast: No need for ANSI C, but required for C++. – Macmade Commented Apr 21, 2010 at 15:00
- Or for that matter, thread_node_t *thread_node = malloc(sizeof *thread_node); . – Steve Jessop Commented Apr 21, 2010 at 15:00
- 1 @Macmade: I'm not wholly decided whether to cast the result of malloc or not, but one of the things that swings it is that as you say, if you leave out the cast it won't compile as C++. I consider this a good reason to leave out the cast! – Steve Jessop Commented Apr 21, 2010 at 15:01
It's because thread_arr is a thread_node_t pointer, and your next member is a struct thread_node_t pointer. Not the same thing.
- What I'm trying to work out, is what is a struct thread_node_t ? Why does the questioner's typedef compile? – Steve Jessop Commented Apr 21, 2010 at 14:55
- 1 Oh, I get it, it's a forward declaration of an incomplete type. – Steve Jessop Commented Apr 21, 2010 at 14:58
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The problem is every time I try to submit this code this message shows up: assignment from incompatible pointer type [enabled by default] I thought the math.h might fix it but negative. Please need help fixing it.
Learn how to fix incompatible pointer type errors in C with this comprehensive guide. Includes detailed explanations of the error, common causes, and how to resolve them.
assignment from incompatible pointer type means that you are assigning a value to a pointer variable from a pointer of a different and incompatible type. In your code that means that p->firstnode and &node are both pointers but the types are not compatible for assignment.
GCC guesses that function pointers with format attributes that are used in assignment, initialization, parameter passing or return statements should have a corresponding format attribute in the resulting type. I.e. the left-hand side of the assignment or initialization, the type of the parameter variable, or the return type of the containing ...
The program runs correctly, but shows the warning for where I have allocated a pointer *Apricotptr to then load the location to point to the first location of the structure.
Re: gcc complains: assignment from incompatible pointer type. Better yet, eliminate the typedef altogether. typedef should be used to make code clearer, not to avoid typing 'struct' when the code in question needs to know that node is, in fact, a struct. I regret that propriety and the forum rules do not permit me to use more forceful terms in ...
#2 2014-05-27 20:44:21 Trilby Inspector Parrot Registered: 2011-11-29 Posts: 30,044 Website The colons are for bit field assignment. The warning is likely due to your function not matching the type that is expected - though I'm not sure why yet, your code matches the tutorial. But are you really using kernel2.6? Last edited by Trilby (2014-05 ...
Learn how to fix the warning of initialization from incompatible pointer type in c programming language from the experts of Stack Overflow.
Well, I was just meaning that to be used as a example of using typedef for function pointers, not that you should copy and paste that into your code. I have no idea why gcc is complaining about bool - are you sure that __stdcall is correct?
Fixing `-Wincompatible-pointer-types` compiler warning. I'm doing polymorphism in C (without ++, it's an embedded target where no C++ compiler is available). All is working well so far, but when I compile the code with a recent GCC (for the unit tests), I have dozens of incompatible-pointer-types warnings which I'd like to fix (if possible).
from declaring a pointer to it) - typedef an anonymous struct as the name LLNODE. So, struct LLNODE and LLNODE are totally different beasties. No wonder the compiler warns about it. I'm a bit surprised it just warns. If you really want typedefs, you could use. typedef struct LLNODE {. char *name; struct LLNODE *next;
Gcc only gives out a warning: `assignment discards qualifiers from pointer target type' against code such as following: $ type a.c int main (void) { const char *pc; char *p = pc; C / C++.
Converting to non-character pointer also risks anti-aliasing (the need for the compiler to keep track that changes of data via one pointer type is reflected in another). Very strange undefined behavior can result.> Better code avoids pointer type changes 1 and when needed, is explicit with a cast.
Warning: pointer targets in passing argument 2 of 'HAL_UART_Receive' differ in signedness [-Wpointer-sign] Go to solution MKork.2 Associate II
One, the variable that refers to the strcmp function must be one of the type char *, which previously in the course is known as a string, the one you are passing is of type char **, although you do not write it that way but as char * [46]. This type of variables, as you define it, declares an array of pointers (46 in particular), it is pointers ...
It is not legal to [..] except for void *, to assign a pointer of one type to a pointer of another type without a cast. which is true if by "legal" they meant "not violating a constraint or syntax rule". The C standard itself doesn't use the word "legal", but saying that something is a constraint violation is as close as it gets to saying something is illegal.
When I compile I get the warning "assignment from incompatible pointer type [enabled by default]" for the last 3 lines so obviously there's something I'm missing.
assignment from incompatible pointer type Asked 14 years, 4 months ago Modified 14 years, 4 months ago Viewed 19k times
Sounds like the reverse engineering of Pokemon. Google told me that the definition I can find online is correct, so you may what to look into your version of list_menu.h to see what the difference is in yours. Reply Share [deleted]