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#include <iostream>
#include <iomanip>
using namespace std;
void mean(int[], int);
void median(int[], int);
void mode(int[], int[], int);
void bubbleSort(int[], int);
void printArray(int[], int);
int main()
{
const int responseSize = 99; // size of array responses
int frequency[10] = { 1 }; // initialize array frequency
int response[responseSize] = // initialize array responses
{ 6, 7, 8, 9, 8, 7, 8, 9, 8, 9,
7, 8, 9, 5, 9, 8, 7, 8, 7, 8,
6, 7, 8, 9, 3, 9, 8, 7, 8, 7,
7, 8, 9, 8, 9, 8, 9, 7, 8, 9,
6, 7, 8, 7, 8, 7, 9, 8, 9, 2,
7, 8, 9, 8, 9, 8, 9, 7, 5, 3,
5, 6, 7, 2, 5, 3, 9, 4, 6, 4,
7, 8, 9, 6, 8, 7, 8, 9, 7, 8,
7, 4, 4, 2, 5, 3, 8, 7, 5, 6,
4, 5, 6, 1, 6, 5, 7, 8, 7 };
// process responses
mean(response, responseSize);
median(response, responseSize);
mode(frequency, response, responseSize);
return 0; // indicates successful termination
} // end main
// calculate average of all response values
void mean(int answer[], int arraySize)
{
int total = 0;
cout << "********\n Mean\n********\n";
// total response values
for (int i = 0; i < arraySize; i++)
total += answer[i];
// format and output results
cout << "fixed" << setprecision(4);
cout << "The mean is the average value of the data\n"
<< "items. The mean is equal to the total of\n"
<< "all the data items divided by the number\n"
<< "of data items (" << arraySize
<< "). The mean value for\nthis run is: "
<< total << " / " << arraySize << " = "
<< static_cast<double>(total) / arraySize
<< "\n\n";
} // end function mean
// sort array and determine median element's value
void median( int answer[], int size )
{
cout << "\n********\n Median\n********\n"
<< "The unsorted array of responses is";
printArray( answer, size ); // output unsorted array
bubbleSort( answer, size ); // sort array
cout << "\n\nThe sorted array is";
printArray( answer, size ); // output sorted array
// display median element
cout << "\n\nThe median is element " << size / 2
<< " of\nthe sorted " << size
<< " element array.\nFor this run the median is "
<< answer[ size / 2 ] << "\n\n";
} // end function median
// determine most frequent response
void mode(int freq[], int answer[], int size)
{
int largest = 0; // represents largest frequency
int modeValue = 0; // represents most frequent response
cout << "\n********\n Mode\n********\n";
// initialize frequencies to 0
for (int i = 1; i <= 9; i++)
freq[i] = 0;
// summarize frequencies
for (int j = 0; j < size; j++)
++freq[ answer[ j ] ];
// output headers for result columns
cout << "Response" << setw( 11 ) << "Frequency"
<< setw(19) << "Histogram\n\n" << setw(55)
<< "1 1 2 2\n" << setw(56)
<< "5 0 5 0 5\n\n";
// output results
for (int rating = 1; rating <= 9; rating++)
{
cout << setw(8) << rating << setw(11)
<< freq[ rating ] << " ";
// keep track of mode value and largest fequency value
if (freq[ rating ] > largest)
{
largest = freq[rating];
modeValue = rating;
} // end if
// output histogram bar representing frequency value
for (int k = 1; k <= freq[rating]; k++)
cout << '*';
cout << '\n'; // begin new line of output
} // end outer for
// display the mode value
cout << "The mode is the most frequent value.\n"
<< "For this run the mode is " << modeValue
<< " which occurred " << largest << " times." << endl;
} // end function mode
// function that sorts an array with bubble sort algorithm
void bubbleSort(int a[], int size)
{
int hold; // temporary location used to swap elements loop to control number of passes
for (int pass = 1; pass < size; pass++) // loop to control number of comparisons per pass
for (int j = 0; j < size ; j++) // swap elements if out of order
if (a[j] > a[j + 1])
{
hold = a[j];
a[j] = a[j + 1];
a[j + 1] = hold;
} // end if
} // end function bubbleSort
// output array contents (20 values per row)
void printArray(const int a[], int size)
{
for (int i = 0; i < size; i++)
{
if(i%20 == 0) // begin new line every 20 values
cout << endl;
cout << setw( 2 ) << a[ i ];
} // end for
}
// end function printArray
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