```cpp
#include <iostream>
using namespace std;
void fillArr(int* pVisitors, int& counter);
void displayArr(int* Visitors, int* pCounter);
void displayLowest(int* pVisitors, int* pCounter);
void displayHighest(int* pVisitors, int* pCounter);
int main() {
const int SIZE = 10;
int arrVisitors[SIZE];
int counter = 0;
fillArr(arrVisitors, counter);
displayArr(arrVisitors, &counter);
displayLowest(arrVisitors, &counter);
displayHighest(arrVisitors, &counter);
return 0;
}
void fillArr(int* pVisitors, int& counter) {
cout << "Enter the number of visitors for day " << (counter+1) << ": ";
cin >> pVisitors[counter];
while(pVisitors[counter] != -1 && counter < SIZE) {
counter++;
cout << "Enter the number of visitors for day " << (counter+1) << ": ";
cin >> pVisitors[counter];
}
}
void displayArr(int* Visitors, int* pCounter) {
cout << "List of visitors per day" << endl;
for(int k = 0; k < *pCounter; k++) {
cout << "Day " << (k+1) << ": " << Visitors[k] << endl;
}
}
void displayLowest(int* pVisitors, int* pCounter) {
int lowest = pVisitors[0];
int lowest_day = 0;
for(int k = 0; k < *pCounter; k++) {
if(pVisitors[k] < lowest) {
lowest = pVisitors[k];
lowest_day = k;
}
}
cout << "Day with the least number of visitors is day " << (lowest_day + 1) << " with " << lowest << " visitors." << endl;
}
void displayHighest(int* pVisitors, int* pCounter) {
int highest = pVisitors[0];
int highest_day = 0;
for(int k = 0; k < *pCounter; k++) {
if(pVisitors[k] > highest) {
highest = pVisitors[k];
highest_day = k;
}
}
cout << "Day with the most number of visitors is day " << (highest_day + 1) << " with " << highest << " visitors." << endl;
}
```
