Given an incomplete program below, complete the program by filling in the blanks with an appropriate C++ statement according to the instructions stated in the comments. Note: Please write C ++ statements WITHOUT blank spaces unless it is absolutely needed. Example: int num,ab; 11 #include using namespace std; 12 13 14 /*a) Declare prototype void function named getinput which has a double pointer as a parameter (2 marks)*/ 15 16 17 18 19 /*b) Declare prototype void function named calcdiscount which has a double pointer (1st parameter) and float pointer to constant (2nd parameter) as parameters (2 marks)*/ 10 11 12 13 14 15 16 17 18 19 20 121 int main() { double a; const float discount = 0.2; getinput(&a); calcdiscount(&a, &discount); cout