Unsure how to work with a function, must follow specific guidelines - c++

Question

I am extremely confused. I have to follow these specific guidelines:
Make a program that will compute and output the average of 10 exam scores, entered by the user. Finish the function, so that the main will work correctly. Feel free to modify the main as you please as well.
I do not believe we need to change the main and do not believe we should use 10 variables. Here is the code I must add to, I believe the main is finished. Your help is very appreciated!!!!
#include <iostream>
using namespace std;
NOT ADD CODE HERE!!!
float calculateAverageTestScore(int amountOfScores);
int main(void)
{
const int NUMBER_OF_SCORES = 10;
cout << "The average test score was: " << calculateAverageTestScore(NUMBER_OF_SCORES) << endl;
return 0;
}
//INPUT: an amount of test scores
//OUTPUT: the average of these scores
//This function will obtain amountOfScores test scores from the user, and return
//their average - to be used elsewhere.
float calculateAverageTestScore(int amountOfScores)
{
float average;
//add code here
return average;
}

Answer 1

Should do the trick.
#include <iostream>
#include <string>
float calculateAverageTestScore(int amountOfScores);
int main() {
const int NUMBER_OF_SCORES = 10;
const float score = calculateAverageTestScore(NUMBER_OF_SCORES);
std::cout << "The average test score was: " << score << '\n';
}
float calculateAverageTestScore(int amountOfScores) {
float sum = 0;
std::string buffer;
for (int i = 0; i < amountOfScores; ++i) {
std::cout << "score #" << i + 1 << ": ";
std::getline(std::cin, buffer);
sum += std::stof(buffer); // TODO: Error handling
}
return sum / amountOfScores;
}