Help with array!

[GoatWater]

I have been able to accomplish this practice problem but I need to be able to enter -1 (meaning last input number) to calculate the average of all numbers, regardless if I enter 2 scores or 25 scores. I'm going to assume a while loop and counter but I'm not too sure how to write it within the array.

Here's what I have so far.

#include <iostream>
using namespace std;

//Number of inspections
const int inspections = 25;

int main()
{
	int sum = 0;
	int average = 0;
	int input;

	//Get inspection scores

	cout << "Enter up to 25 scores followed by -1 (you do not need to type 25 scores)." << endl;
	cout << endl;

	for (int i = 0; i != inspections; ++i)
	{
		cout << "Enter inspection score: " << endl;
		cin >> input;

		sum += input;
	}

	// Get average and print it
	average = sum / inspections;
	cout << endl;

	cout << "The average of all inspection scores is: " << average << endl;
	cout << endl;

	system("pause");
	return 0;
}

[SamuelAdams]

This may not work exactly the way I think it will but should get you started.

	for (int i = 0; i != inspections; ++i)
	{
		cout << "Enter inspection score: " << endl;
		cin >> input;

		if (input < 0)
			{break;}
		else
			{sum += input;}
	}

[GoatWater]

I will give this a whirl and let you know! Thanks!

[GoatWater]

Well it definitely works but it's using -1 as a score as well.... so i'll type in

score 1. 9
score 2. 9
score 3. 9
score 4. -1 (to initiate average of previous scores)
output - average is 1

[JLBorges]

#include <iostream>

int main()
{
    const int MAX_INSPECTIONS = 25; // maximum number of inspections
    const int SENTINEL = -1 ; // sentinel to indicate end of input

    int num_scores_entered = 0 ; // actual number of scores entered
    long long sum = 0; // sum of all the scores

    // Get inspection scores
    std::cout << "Enter up to a maximum of " << MAX_INSPECTIONS << " scores. "
              << "end input with " << SENTINEL << '\n' ;
    int score ;
    while( num_scores_entered < MAX_INSPECTIONS && // max number of scores have not been reached and
           std::cout << "score? " &&
           std::cin >> score && // a score was successfully read from stdin and
           score != SENTINEL ) // it is not the sentinel indicating end of input
    {
        sum += score ;
        ++num_scores_entered ;
    }

    std::cout << "\n#scores: " << num_scores_entered << '\n'
              << "sum: " << sum << '\n' ;

    // Get average and print it
    if( num_scores_entered != 0 ) // if at least one score was entered
    {
        const double average = double(sum) / num_scores_entered ; // avoid integer division
        std::cout << "The average of all inspection scores is: " << average << '\n' ;
    }
}