error: incompatible types in assignment

[fishwater00]

Question 1:

    typedef struct
    { int x, y, z ;
      float *wave;
      float *velocity;
    }Model;
 
    void a(Model *domain);
    void b(Model *domain, int t);
 
 
    int main()
    {int i;
     int j=10;
 
     Model Domain;
     Domain=(Model *)malloc(sizeof(Model);  
 
     for (i=0; i<10; i++)
        a(domain);
 
     return;
    }
 

if I block "Domain=(Model *)malloc(sizeof(Model)", the compiler doesnt show any error,
but if this line is visible or avaliable, the error will come out:

error: incompatible types in assignment;

If anyone can give me the direction of this problem, highly appreciated ~



Question 2:

      typedef struct
    { int x, y, z ;
      float *wave;
      float *velocity;
    }Model;
 

I define a struct (Model) in struct.h file, which can be called by any other functions. Another header file is called "functions.h" which includes
all functions I have, such as a(Model *domain, int t), b(int d, int f, int g) .

When I compile my whole codes, the compile shows some errors:

error: syntax error before "*" token. This error points to a(Model *domain, int t). why does it show here? I declare struct in .h file and every subfunctions (a(), b()) also include it.
I am confused about this problem.

[gpraghuram]

Answer for question 1...
You are trying to allocate memory for a stack object.
Malloc shou;ld be used only for pointers

Raghu

[JosAH]

Question 1:

Model Domain;
Domain=(Model *)malloc(sizeof(Model);  
 

Your Domain variable has type Model. You cast the pointer returned by malloc
to a pointer to a Model. A pointer to a Model isn't a Model. Make your Domain
variable a pointer to a Model instead:

Model* Domain;
Domain=(Model *)malloc(sizeof(Model);  
 

kind regards,

Jos

[jorba101]

Or... don't do a malloc at all for the domain variable, eg:

Modeldim domain;

And that's all. I have the feeling you're trying to run before walking. Maybe you should first try your program without mallocs (do you really need them?).

[jorba101]

No clue regarding your second question. Maybe you could paste in some code.

[weaknessforcats]

I define a struct (Model) in struct.h file, which can be called by any other functions. Another header file is called "functions.h" which includes
all functions I have, such as a(Model *domain, int t), b(int d, int f, int g) .

When I compile my whole codes, the compile shows some errors:

Does functions.h include struct.h ?
Does the code include struct.h before including functions.h?

If the answer to both these questions is NO, then you have your answer.

[fishwater00]

Does functions.h include struct.h ?
Does the code include struct.h before including functions.h?

If the answer to both these questions is NO, then you have your answer.

I modified my codes like you said, it works now. Thank you very much.