C++ program: How to fix the following message: The value of parameter n cannot be used as a constant and the value of variable count cannot be used as a constant in this program?

#include

#include

#include

#include

using namespace std;

//function for average

double average(int arr[], int n)

{

double sum = 0; //initialize sum to 0

int i; //to iterate

//get sum

for (i = 0; i

sum += arr[i];

return sum / i; //return average

}

//median function

double median(int arr[], int n)

{

THE VALUE OF PARAMETER n CANNOT BE USED AS A CONSTANT

int arr_dup[n]; //duplicate array

int i = 0; //to iterate

//copy arr to arr_dup

while (i

{

arr_dup[i] = arr[i];

i++;

}

//sort dup_arr

sort(arr_dup, arr_dup + n);

//return median

if (n % 2 != 0)

return arr_dup[n / 2];

else

return (arr_dup[n / 2] + arr_dup[n / 2 - 1]) / 2;

}

//function for mode

int mode(int arr[], int n)

{

THE VALUE OF PARAMETER n CANNOT BE USED AS A CONSTANT

int freq[n] = { 0 }; //frequency

int i, j; //to iterate

//calculate frequency

for (i = 0; i

{

for (j = 0; j

{

if (arr[i] == arr[j])

freq[i]++;

}

}

//assume first element as mode

int mode_index = 0;

//find mode

for (i = 1; i

{

if (freq[i]>freq[mode_index])

{

mode_index = i;

}

}

return arr[mode_index]; //return mode

}

//display results

void display(double avg, double med, int mod, string least, string most)

{

cout << "Average: " << avg << endl;

cout << "Median: " << med << endl;

cout << "Mode: " << mod << endl;

cout << "Student who watched least no. of movies: " << least << endl;

cout << "Student who watched most no. of movies: " << most << endl;

}

//execution begins here

int main()

{

ifstream inFile("movies.txt"); //open file

string line; //to read line

int count = 0; //to count students

//count students

while (getline(inFile, line))

count++;

inFile.close(); //close file

THE VALUE OF VARIABLE COUNT CANNOT BE USED AS A CONSTANT

int movies[count]; //no. of movies array

string students[count]; //students array

string fName, lName; //to read first name and last name

int i = 0; //to iterate

inFile.open("movies.txt"); //open file again

//read data

while (getline(inFile, line))

{

istringstream iss(line); //string stream

iss >> fName >> lName >> movies[i]; //read values

students[i] = fName + " " + lName; //put student name in array

i++; //increment index

}

//call functions

double avg = average(movies, count);

double med = median(movies, count);

int mod = mode(movies, count);

//find students with least and most number of movies

string least, most;

int min, max;

least = most = students[0];

min = max = movies[0];

for (i = 1; i

{

if (movies[i]>max)

{

max = movies[i];

most = students[i];

}

else if (movies[i]

{

min = movies[i];

least = students[i];

}

}

//call function to display results

display(avg, med, mod, least, most);

inFile.close();

system("pause");

return 0;

}

Movies.txt

Murray Brandl 3

Christal Delamater 4

Zetta Kinlaw 7

Elia Roy 3

Delmer Bibb 4

Joannie Nevers 4

Roselle Gose 10

Jonathan Basnett 0

Marcel Earwood 12

Marina Newton 2

Magdalen Stephan 3

Deane Leach 5

Mariana Crosley 6

Darby Froman 5

Shonda Kyzer 4

Ilana Netto 4

Candida Magnani 1

Laurena Stiverson 2

Elouise Muir 4

Rene Holiday 2