Ordering an Array of ints

[iiSoMeGuY 7x]

Assignment: Test Averaging
Write a program that dynamically allocates an array large enough to hold any number of test scores the user wishes to enter. Once all the scores are entered, the array should be passed to a function that sorts them in ascending order. Another function should then be called that calculates the average score. The program should display the sorted list of scores and average, with appropriate headings.

Help Information:
I have been learning C++ from this book I bought a while back, and after every chapter it has a 'Review Questions and Exercises' section, of which I chose to do the 'Programming Challenges' to make sure I understand the concepts discussed in the chapter. This is good practice, but the major downside is that in some challenges it asks you to do something it hasn't gone over in detail, or just figures you should know.
EDIT: I have the program working, and yes, I know, it's not perfect. If you add two or more test scores with the same value it will mess up the listing. But, since this isn't for a grade I don't really care. If you want to post something to help me out, be my guest, otherwise thank you for your time

#include <iostream>
#include <iomanip>
#include <cstdlib>
using namespace std;

void getOrder(int [], int);
float getAvg(int [], int);

int main()
{
    int *input, SIZE;

    cout << "How many test scores do you have?\n";
    cin >> SIZE;
    system("CLS");
    input = new int[SIZE];
    for (int num = 0; num < SIZE; num++)
        {
            cout << "Test Score " << (num + 1) << ": ";
            cin >> input[num];
        }
    getOrder(input, SIZE);
    delete [] input;
    system("PAUSE");
    return 0;
}

void getOrder(int input[], int SIZE)
{
    int test[SIZE], order[SIZE], high;
    for (int num = 0; num < SIZE; num++)
        {
            test[num] = input[num];
        }
    for (int count = 0; count < SIZE; count++)
        {
            high = test[count];
            for (int num = 0; num < SIZE; num++)
                {
                    if (test[num] > high)
                        high = test[num++];
                }
            order[count] = high;
            for (int num = 0; num < SIZE; num++)
                {
                    if (high == test[num])
                        {
                            test[num] = 0;
                        }
                }
        }
    cout << "Test Scores in Numerical Order:\n";
    for (int num = 0; num < SIZE; num++)
        {
            cout << (num + 1) << ". " << order[num] << endl;
        }
    cout << "\nAverage: " << fixed << showpoint << setprecision(2) << getAvg(input, SIZE) << endl;
}

float getAvg(int input[], int SIZE)
{
    int total = 0;
    float avg = 0;

    for (int num = 0; num < SIZE; num++)
        {
            total += input[num];
        }
    avg = total / SIZE;
    return avg;
}

[aamir121a]

Just as a pointer have a look at std::vectors or std::list , people here do not usually answer assignment related questions

[Lindley]

You don't want to simply "list" elements of the array----you actually want to re-order the elements in the array. When the array is sorted, simply outputting the elements will write them in order. At this point, identifying the max and min is also trivial----the first and last elements.

So how do you sort? That depends. There is a sorting algorithm available in the standard library. If you'd rather write your own, there are a variety of algorithms available with varying degrees of complexity and speed. Bubble sort is one of the simplest but also the slowest; quicksort is one of the fastest, but is a bit more complex.

[Paul McKenzie]

Assignment: Test Averaging
Write a program that dynamically allocates an array large enough to hold any number of test scores the user wishes to enter. Once all the scores are entered, the array should be passed to a function that sorts them in ascending order. Another function should then be called that calculates the average score. The program should display the sorted list of scores and average, with appropriate headings.

Since you posted an answer, I'll give you this to consider:

#include <algorithm>
#include <vector>
#include <iostream>
#include <numeric>

using namespace std;

int main()
{
   int numScores;
   cin >> numScores;  // the number of scores
   std::vector<int> theScores(numScores);
   for (int num = 0; num < numScores; ++num)
       cin >> theScores[num];   // each score

   sort(theScores.begin(), theScores.end());  // sort the scores 

   // get the average
   double average = double(accumulate(theScores.begin(), theScores.end(), 0)) / (double)numScores;  

   // output the results
   cout << "The average is " << average << "\n";
   cout << "The numbers sorted are: " << "\n";
   copy(theScores.begin(), theScores.end(), ostream_iterator<int>(std::cout, " "));
}

Compile and run this program -- see what you get. You'll see that the C++ library, when learned, can do a lot of the things you're doing now "by hand".

Regards,

Paul McKenzie

[Philip Nicoletti]

    cout << "How many test scores do you have?\n";
    cin >> SIZE;
    system("CLS");
    for (int num = 0; num < SIZE; num++)
        {
            input = new int[SIZE];
            cout << "Test Score " << (num + 1) << ": ";
            cin >> input[num];
        }

The "new" should be outside of the loop. You only allocate once.

[iiSoMeGuY 7x]

Just as a pointer have a look at std::vectors or std::list , people here do not usually answer assignment related questions

Well, it's not for a class, it's from a book I bought Starting Out With C++ (4th Ed.), and I'm in the process of self teaching myself and have no one else to ask
I also haven't learned how to do that yet, I'm on chapter 8 of 14, and what you're talking about is in chapter 11.

So how do you sort? That depends. There is a sorting algorithm available in the standard library. If you'd rather write your own, there are a variety of algorithms available with varying degrees of complexity and speed. Bubble sort is one of the simplest but also the slowest; quicksort is one of the fastest, but is a bit more complex.

Wow, why would my book ask me to do something it hasn't taught me?

Since you posted an answer, I'll give you this to consider:
...
Compile and run this program -- see what you get. You'll see that the C++ library, when learned, can do a lot of the things you're doing now "by hand".

Regards,

Paul McKenzie

Ya, I saw something like this while googling how to sort in C++, but I'm trying to keep in the confines of my book (if that's possible in this situation), but if I have to I'll use this, thanks anyways.

[iiSoMeGuY 7x]

    cout << "How many test scores do you have?\n";
    cin >> SIZE;
    system("CLS");
    for (int num = 0; num < SIZE; num++)
        {
            input = new int[SIZE];
            cout << "Test Score " << (num + 1) << ": ";
            cin >> input[num];
        }

The "new" should be outside of the loop. You only allocate once.

Dude, I love you (no homo), I totally missed that! I now have the program working and just updated my post

[Alterah]

I had an assignment in a second semester programming class where we had to compare different sorting algorithms. We went over the algorithms in class, but the teacher didn't have us actually write them. At the time, he felt while we could do some of the more simpler algorithm, quick sort, merge sort, and a couple others would be too difficult at the time. We probably could have figured it out, but I believe in the TAs for the class made some mistakes on the harder algorithms initially and had to fix it.

The point I am trying to make, is that you are better off using the STL if you can. Whenever I code at home I make extensive use of it. Compared to vectors, dynamic arrays are a "pain" to deal with. I know you are trying to stick with the book, but Google is also an invaluable resource.

[iiSoMeGuY 7x]

The point I am trying to make, is that you are better off using the STL if you can. Whenever I code at home I make extensive use of it. Compared to vectors, dynamic arrays are a "pain" to deal with. I know you are trying to stick with the book, but Google is also an invaluable resource.

Very true, without Google my programs wouldn't even run (my book doesn't teach system() commands), but even so I only use Google as a last resort. This is because I want to learn stuff in order, and once I get a good grasp on basic C++ I will start using Google and other sources in my code (so I don't just copy and paste, I want to know what I'm doing).

[Alterah]

Very true, without Google my programs wouldn't even run (my book doesn't teach system() commands), but even so I only use Google as a last resort. This is because I want to learn stuff in order, and once I get a good grasp on basic C++ I will start using Google and other sources in my code (so I don't just copy and paste, I want to know what I'm doing).

I see your point. I don't know if others would recommend learncpp.com
, but I found the site helpful when I looking into a second explanation. Not to mention, the site is structured basically like a book. Might be helpful

[iiSoMeGuY 7x]

I see your point. I don't know if others would recommend learncpp.com
, but I found the site helpful when I looking into a second explanation. Not to mention, the site is structured basically like a book. Might be helpful

Well, it's a little different from I'm used to, but it does look promising, thanks for the tip