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//Written by Morgan Cassiday 3/17/2015
// This program preforms a simple statistical analysis
// of a set of test scores with range 0 ... 100
// It reads from a text data file and writes a summary repot
#include <iostream>
#include <iomanip>
#include <cmath>
#include <fstream>
#include <string>
using namespace std;
double calcAvg(int score[], int numElems);
void minMax(int score[], int numElems);
double StandardDevCalc(int inValues[], int numElems, double Ave);
void QSummary(int Score[], int numElems);
const int Size = 500; // Size declaration of array
int main()
{
int numElems;
int Score[Size];
double average;
double StandardDev;
ifstream inputFile; //Input file stream object
//Open file and validate file has open. Throw exception if necessary.
inputFile.open("pgm5data.txt");
if (!inputFile) cout << "Problems with file!\n";
//Read numbers from file into the array.
int count;
for (count = 0; count < Size && inputFile >> Score[count]; count++);
inputFile >> Score[count];
//Variable initalized to the known size of the array.
numElems = count;
cout << "You have " << numElems << " numbers of data elements in the data set" << endl;
//Function to calculate average score; results returned to main.
average = calcAvg(Score, numElems);
// Function call for Min and Max
minMax(Score, numElems);
//Display the average.
cout << "The average score is: " << average << endl << endl;
//StandardDev
StandardDev = StandardDevCalc(Score, numElems, average);
cout << "The standard deviaion is: " << StandardDev << endl;
// Q Summary
QSummary(Score, numElems);
system("pause");
return 0;
} // end main function
// Calculate the mean (average) value for the data set
double calcAvg(int score[], int numElems)
{
double sum = 0.0;
for (int i = 0; i < numElems; i++)
sum = sum + score[i];
return sum / numElems;
}
// Calculate the Mix/Min Value
void minMax(int score[], int numElems)
{
int i;
double max = score[0];
for (i = 1; i < numElems; i++)
{
if (score[i] > max)
max = score[i];
}
double min = score[0];
for (i = 1; i<numElems; i++)
{
if (score[i] < min)
min = score[i];
}
cout << "The minimum test score is: " << min << endl;
cout << "The maximum test score is: " << max << endl << endl;
}
// Calculate the standard deviation
// Using the array of data, number of elements, and the mean value
// This function should receive the array, array size,
// the average value of the dataset, and return the standard
// deviation as a floating point value
double StandardDevCalc(int inValues[], int numElems, double Ave)
{
double StandardDev;
double sum = 0;
double temp;
for (int i = 0; i < numElems - 1; i++)
{
temp = inValues[i] - Ave;
sum = sum + pow(temp, 2);
}
StandardDev = sqrt(sum / (numElems - 1));
return StandardDev;
}
// Determine and Write Quartile Summary
// Calculate and write the number of list values
// in each quartile to the console
void QSummary(int Score[], int numElems)
{
int i = 0, quartile4 = 0, quartile3 = 0, quartile2 = 0, quartile1 = 0;
while (i < numElems)
{
if (Score[i] > 74)
quartile4++;
else if (Score[i] > 49)
quartile3++;
else if (Score[i] > 24)
quartile2++;
else if (Score[i] < 24)
quartile1++;
}
cout << "Quartile 4, scores between 75 - 100: " << quartile4 << endl;
cout << "Quartile 3, scores between 50 - 74: " << quartile3 << endl;
cout << "Quartile 2, scores between 25 - 49: " << quartile2 << endl;
cout << "Quartile 1, scores between 0 - 24: " << quartile1 << endl;
}
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