CS216 Lab1 [5]

//Lab 1 Wilson, Drayden T Th

#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>

using namespace std;

#define ARR_MAX 15

void FillArrays(int evens[], int odds[], int& evenCount, int& oddCount);
void BubbleSort(int arr[], int arrSize);
int CalcArraySum(int arr[], int arrSize);
float CalcArrayMedian(int arr[], int arrSize);
void OutputArray(ofstream& outFile, int arr[], int arrSize);
void DisplayHighestValues(int arr[], int arrSize, int userValue);
void DisplayLowestValues(int arr[], int arrSize, int userValue);
void RuntimeError(const string errorMessage);

int main()
{
    ofstream outFile;
    int evens[ARR_MAX], odds[ARR_MAX], evenCount = 0, oddCount = 0, userMenuSelection = 0;

    FillArrays(evens, odds, evenCount, oddCount);
    BubbleSort(evens, evenCount);
    BubbleSort(odds, oddCount);

    cout << "[1] Display the number of entries and totals of each list.\n"
        << "[2] Display the averages of each list.\n"
        << "[3] Display the medians of each list.\n"
        << "[4] Output sorted lists to file.\n"
        << "[5] Display the highest X values of each list.\n"
        << "[6] Display the lowest X values of each list.\n"
        << "[7] Exit.\n\n";

    do
    {
        static int evenSum = CalcArraySum(evens, evenCount), oddSum = CalcArraySum(odds, oddCount);
        int userOutputChoice; //for options 5 & 6
        float evenMedian = 0, oddMedian = 0;
        static bool sumCalculated = 0, medianCalculated = 0;

        cout << setprecision(2) << fixed; //where to put this?~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

        if (userMenuSelection)
        {
            cout << "\n\nSelect another option: ";
        }
        else
        {
            cout << "Select an option by entering its corresponding number: ";
        }

        cin >> userMenuSelection; //assuming only integer input

        switch (userMenuSelection)
        {
        case 1:
            cout << "# of Even Entires: " << evenCount
                << "\nSum of Even Entries: " << evenSum
                << "\n# of Odd Entires: " << oddCount
                << "\nSum of Odd Entries: " << oddSum;
            break;
        case 2:
            cout << "Average of Even Entries: ";
            if (evenCount)
            {
                cout << (float)evenSum / evenCount;
            }
            else
            {
                cout << "N/A\n";
            }

            cout << "\nAverage of Odd Entries: ";
            if (oddCount)
            {
                cout << (float)oddSum / oddCount;
            }
            else
            {
                cout << "N/A\n";
            }
            break;
        case 3:
            if (!medianCalculated)
            {
                evenMedian = CalcArrayMedian(evens, evenCount);
                oddMedian = CalcArrayMedian(odds, oddCount);
                medianCalculated = 1;
            }

            cout << "Median of Even Entries: ";
            if (evenCount)
            {
                cout << evenMedian;
            }
            else
            {
                cout << "N/A\n";
            }

            cout << "\nMedian of odd Entries: ";
            if (oddCount)
            {
                cout << oddMedian;
            }
            else
            {
                cout << "N/A\n";
            }
            break;
        case 4:
            outFile.open("output.txt");

            outFile << "Even Array: ";
            OutputArray(outFile, evens, evenCount);
            outFile << "\nOdd Array: ";
            OutputArray(outFile, odds, oddCount);

            outFile.close();

            cout << "Print to file successful.\n";
            break;
        case 5:
            cout << "Enter a value for X: ";
            cin >> userOutputChoice;

            cout << "Highest " << userOutputChoice << " Even Entries: ";
            DisplayHighestValues(evens, evenCount, userOutputChoice);
            cout << "Highest " << userOutputChoice << " Odd Entries: ";
            DisplayHighestValues(odds, oddCount, userOutputChoice);
            break;
        case 6:
            cout << "Enter a value for X: ";
            cin >> userOutputChoice;

            cout << "Lowest " << userOutputChoice << " Even Entries: ";
            DisplayLowestValues(evens, evenCount, userOutputChoice);
            cout << "Lowest " << userOutputChoice << " Odd Entries: ";
            DisplayLowestValues(odds, oddCount, userOutputChoice);
            break;
        case 7:
            cout << "Exiting the program.\n\n";

            break;
        default:
            cout << "Invalid menu option selected.\n";

            userMenuSelection = 1; //avoids repetion of initial instructions if 0
            break;
        }
    } while (userMenuSelection != 7);

    system("pause");
    return 0;
}

//Assigns both arrays and array size variables
//pre: input file is open
//post: both arrays are populated and size variables are defined
void FillArrays(int evens[], int odds[], int& evenCount, int& oddCount)
{
    ifstream inFile;
    int value;

    inFile.open("input.txt");

    if (!inFile)
    {
        RuntimeError("Failed to open input file.");
    }
    else
    {
        cout << "Input file read successfully.\n\n";
    }

    for (int i = 0; inFile >> value && evenCount < ARR_MAX && oddCount < ARR_MAX; ++i)
    {
        if (value % 2 == 0)
        {
            evens[evenCount++] = value;
        }
        else
        {
            odds[oddCount++] = value;
        }
    }

    inFile.close();

    if (evenCount == 0 && oddCount == 0)
    {
        RuntimeError("Input file is empty."); //no even or odd entries are read
    }
    else if (!inFile.eof())
    {
        RuntimeError("Excess entries detected."); //more than ARR_MAX even or odd entries are read
    }
}

//Sorts array
//pre: array is populated and array size is defined
//post: array is sorted in ascneding order
void BubbleSort(int arr[], int arrSize)
{
    int i, j;

    for (i = 0; i < arrSize - 1; ++i)
    {
        for (j = 0; j < arrSize - i - 1; ++j)
        {
            if (arr[j] > arr[j + 1])
            {
                int temp = arr[j];
                arr[j] = arr[j + 1];
                arr[j + 1] = temp;
            }
        }
    }
}

//Calculates sum of all elements in array
//pre: array is populated and array size is defined
//post: returns sum of all array elements
int CalcArraySum(int arr[], int arrSize)
{
    int sum = 0;

    for (int i = 0; i < arrSize; ++i)
    {
        sum += arr[i];
    }
    return sum;
}

//Calculates median value of array elements
//pre: array is populated and array size is defined
//post: returns median of array elements
float CalcArrayMedian(int arr[], int arrSize)
{
    if (arrSize % 2 == 0)
    {
        return (arr[(arrSize / 2) - 1] + arr[arrSize / 2]) / 2.0; //return in if body, is this ok?~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    }
    else
    {
        return arr[arrSize / 2];
    }
}

//Prints array to output file
//pre: output file is open, array is populated and array size is defined
//post: array is printed to file
void OutputArray(ofstream& outFile, int arr[], int arrSize)
{
    int i;
    for (i = 0; i < arrSize; ++i)
    {
        outFile << arr[i] << ' ';
    }

    if (!i)
    {
        outFile << "N/A";
    }
}

//Prints highest X values of array determined by user
//pre: array is populated, array size is defined and user value is defined
//post: highest X values of array are printed
void DisplayHighestValues(int arr[], int arrSize, int userValue)
{
    int i;

    for (i = 0; i < userValue && i < arrSize; ++i)
    {
        cout << arr[arrSize - 1 - i] << ' ';
    }

    if (!i)
    {
        cout << "N/A";
    }

    cout << endl;
}

//Prints lowest X values of array determined by user
//pre: array is populated, array size is defined and user value is defined
//post: lowest X values of array are printed
void DisplayLowestValues(int arr[], int arrSize, int userValue)
{
    int i;

    for (i = 0; i < userValue && i < arrSize; ++i)
    {
        cout << arr[i] << ' ';
    }

    if (!i)
    {
        cout << "N/A";
    }

    cout << endl;
}

//Outputs a unique error message and ends the program
//pre: N/A
//post: error message has been output and program has ended
void RuntimeError(const string errorMessage)
{
    cout << "Error: " << errorMessage << " Exiting program.\n\n";
    system("pause");
    exit(1);
}