C++

Download the attached program and complete the functions. (Referto comments)

main.cpp ~#include #include #define END_OF_LIST -999using namespace std;/* * */int exercise_1() {  int x = 100;   int *ptr;     // Assign the pointer variable, ptr, to the address of x. Then print out   // the 'value' of x and the 'address' of x.  (See Program 10-2)     return 0; }int exercise_2() {  int x = 100;   int *ptr;     // Assign ptr to the address of x. Then use indirection to print out the   // value of x using pointer variable. (See Program 10-3)     return 0;}int exercise_3() {  int a[] = {1,2,3,4,5,6,7,8,9};  int *n;     // Print the address of the array a,     // Notice that printing the address of an array is different then printing  // the address of a variable.     // Assign the address of the array to the variable n. Then de-reference n   // to print out the first, third and fifth elements. (See Programs 10-5 and   // 10-6)   return 0;}int exercise_4() {  int a[] = {1,2,3,4,5,6,7,8,9};  int *n;      // Assign the address of the array to the variable n. Then use a loop to   // print out each element using a while loop (See Program 10-9)   for (int i=0; i<9; i++) {    cout << \"Element \" << i << \" is \" << \"... \" << endl;  }  return 0;}int main() {  exercise_1();  exercise_2();  exercise_3();  exercise_4();}