Class 20: Function Pointers

Question 1

Int (*func1)()

Answer 1

Function pointer

Question 2

Are the parentheses around (*func) necessary?

Answer 2

Yes or else the compiler will treat this as a declaration of a function which RETURNS a pointer and not a function pointer

Question 3

Suppose you have the following function pointer
Int (fp)(int, int)

And the function
Int return max(int size, const int*array)

Answer 3

Fp = &returnMax
Or fp = returnMax

ReturnMax must be declared (but not necessarily defined) before assigning to address to the function

Question 4

If function has not parameters and not return value, how would be call the function suing function pointer

Answer 4

(*fp)()

Question 5

Can you call using a function pointer without dereferencing?

Answer 5

Yes
Ex:
Int I = fp(argument1, argument2)
I = fp()

Question 6

Array of function pointers

Answer 6

Float (*fp_array[4])(float,float);
Fp_array[0]= add;
Fp_array[1] = substract;
Fp_array[2] = multiply;
Fp_array[3] = divide;

Question 7

Passing a pointer to the array of function pointers is passed to the function

Answer 7

Float math_op(**fp_array)(float,float))