Could u please help me with this zybooks questions?

The root mean square is a specific kind of average which is used for various purposes. It is given by the formula shown here. This means that a sequence of values is squared and summed, then divided by the count of the values; the entire calculation is then square-rooted. Ask the user for input; stop when the user enters -1. Be sure to use the square and squareRoot functions you used in "Gentle" exercise 9.1. Here is a sample run:

Enter a positive number: 1
Enter a positive number: 2
Enter a positive number: 3
Enter a positive number: 4
Enter a positive number: 5
Enter a positive number: -1
The root mean square is 3.31662

 

Here is my code:

#include <iostream>

#include <math.h>

 

using namespace std;

 

int square(int);

double squareRoot(int);

 

int main()

{

int sum = 0;

int avg = 0; // To store mean of all the squared values

int counter = 0; // To store the no. of values entered by the user.

int n; // To store the value entered by the user.

double rms; // To store the final rooted mean value of the squared numbers

 

do{

cout << "Enter a positive number: "<<n<<endl;

cin >> n;

 

// If user enters the value for n as -1

if (n == -1)

break;

 

counter += 1; // Increment value of counter by 1 each time user enters a value

 

sum = sum + square(n); // Square and add

 

}while (n != -1); // Stop getting input when user enters -1

 

avg = sum / counter; // Mean of all the values

 

rms = squareRoot(avg); // RMS value

 

cout << "nThe root mean square is " << rms;

 

return 0;

}

 

// Function square() to return square of a number

int square(int n){

return n*n;

}

 

// Function squareRoot() to return the square root of a number

double squareRoot(int avg){

return sqrt(avg);

}

 

 

But didn't go though the zybooks, it said:

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