Problem with function's pointer!

I'm embedded C programmer, a new one, and my SW arch. gave me a problem. I should call a function, throw a pointer, from address that is already given in the header of the problem, in the ROM without defining the function's pointer type. Does somebody knows about this. Any idea is worthfull!

I'm unsure what you are after. Calling the function in your code by using a pointer to the function or declaring its prototype or maybe none of the above. Could you shed more light on the problem.

I have a code of function on specific address in the rom. So, I have to call that function, get the back result of that function and print it....

Do you just need to know how to declare a pointer to a function as in

Code:

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(int) (*pfi) (int, char *); /* pfi is a pointer to a function that takes two arguments and returns an int */

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Easy enough.

Code:

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typedef int /* return type */ (myfncptr_t /* name */)(/* parameter list*/int x);
myfncptr_t* p = (myfncptr*)address;
int x = p(1000);

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Thanks.... I got the point!