We want to write a generic function that can add all the elements of an array (of unknown type, e.g. real numbers, complex numbers, vectors, matrices, ...) and get the result of the sum (of unknown type), either as a return value or passed by reference (then returning some error code).
What are the possible prototypes for such a function? Penalty for wrong ticks.

Question

We want to write a generic function that can add all the elements of an array (of unknown type, e.g. real numbers, complex numbers, vectors, matrices, ...) and get the result of the sum (of unknown type), either as a return value or passed by reference (then returning some error code). 
 What are the possible prototypes for such a function? Penalty for wrong ticks.

Answer

double add_all(void* tab, size_t el_size, size_t nb_el, double (*add_element)(void*, void*));

Answer

void* add_all(void* tab, size_t el_size, void* (*add_element)(void*, void*));

Answer

int add_all(void* tab, size_t el_size, size_t nb_el, void* (*add_element)(void*, void*), void** result);

Answer

void* add_all(void* tab, void* (*add_element)(void*, void*));

Answer

void* add_all(void* tab);

Answer

void* add_all(void* tab, size_t el_size, size_t nb_el, void* (*add_element)(void*, void*));

Answer

double add_all(void* tab, size_t el_size, size_t nb_el, void* (*add_element)(void*, void*));

Answer

void* add_all(void* tab, size_t el_size, size_t nb_el);

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We want to write a generic function that can add all the elements of an array (o...

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