Please fill in the blanks. No work need to be shown. It's in C++

1 2 3 4 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,a,b; #include using namespace std; /*a) Declare prototype void function named getinput which has a double pointer as a parameter (2 marks)*/ 6 8 29 110 11 112 13 \*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) int main() { double aj const float discount = 0.2; 114 115 116 17 18 19 20 21 22 23 24 25 26 27 28 29 getinput(&a); calcdiscount(&a, &discount); cout