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//Alexandros Panayi
//CS 003A Random Number Program
//Done with Visual Studio 2013
//QT creator not downloaded yet
#include <iostream>
#include <cstdlib>
#include <ctime>
#include <string>
#include <iomanip>
#include <cmath>
using namespace std;
void createList(int *&list, int &size); //create pointer variable int refering to address list
int getInput(int min, int max, string title); //create input function
void loadArray(int *list, int size, int min, int max); //create construction of array
void display(int list[], int size, string title); //display function
void sort(int *list, int size, string title);
void swap(int *x, int *y);
void getMin(int list[], int size); //obtain min value
void getMax(int list[], int size); //obtain max value
int getMean(int list[], int size); //obtain mean value
double getSD(int list[], int size, int average); //obtain mean and standard deviation
int main()
{
//QCoreApplication a(argc, argv);
srand(time(NULL));
int size, *list;
double standard;
int average;
createList(list, size);
average = getMean(list, size);
cout << "The average is " << average << endl;
standard = getSD(list, size, average);
cout << "The Standard Deviation is " << standard << endl;
delete[] list; //deallocates memory pointed by list, allowing storage space previously used to be called by new operator
system("PAUSE"); //visual pause operator
return 0;
}
void display(int list[], int size, string title)
{
cout << title << endl;
for (int i = 0; i < size; i++)
{
if (i % 10 == 0) //used to create 10 rows, move onto next row
cout << endl;
cout << setw(5) << *(list + i);//set width of 5 spaces
}
if (size % 10 == 0)
cout << endl;
cout << endl;
}
void createList(int* &list, int &size)
{
size = getInput(0, 1000000, "What is the size of the array you want? ");
list = new int[size]; //allocating new memory size
int max = (unsigned(~0) >> 1); //unsign sin bit, shift right 1
int min;
min = -max;
min = getInput(min, max, "What is the smallest value you wish to see in the array? ");
max = getInput(min, max, "What is the maximim value you wish to see in the array? ");
loadArray(list, size, min, max);
getMean(list, size);
display(list, size, "your data!");
sort(list, size, "Sorting!");
getMin(list, size);
getMax(list, size);
}
int getInput(int min, int max, string title)
{
int value;
bool again = true;
do
{
cout << title;
cin >> value;
if (value<min || value > max)
cout << "Illegal input. Your entry must be between " << min << " and " << max << endl
<< "Please re-enter" << endl;
else
again = false;
} while (again);
return value;
}
void loadArray(int *list, int size, int min, int max)
{
int num;
for (int i = 0; i < size; i++)
{
while ((num = (int)pow(-1., rand() % 2)*rand()) < min || num > max);
*(list + i) = num;
}
}
void sort(int *list, int size, string title)
{
cout << title << endl;
for (int i = 0; i < size; i++)
for (int j = 0; j < size; j++)
if (*(list + i) < *(list + j))
swap(list + i, list + j);
}
void swap(int *x, int *y)
{
int temp = *x;
*x = *y;
*y = temp;
}
void getMin(int list[], int size)
{
int minValue = list[0];
for (int i = 0; i < size; i++)
{
if (list[i] < minValue)
{
minValue = list[i];
}
}
cout << "The lowest value is " << minValue << endl;
}
void getMax(int list[], int size)
{
int maxValue = list[0];
for (int i = 0; i <size; i++)
{
if (list[i] > maxValue)
{
maxValue = list[i];
}
}
cout << "The max value is " << maxValue << endl;
}
double getSD(int list[], int size, int average)
{
double sd;
double sdfactor;
sdfactor = 0;
for (int j = 0; j < size; j++)
{
sdfactor = sdfactor + list[j] - average; //subtract mean from each element in array
sd = sqrt(pow(sdfactor, 2) / size); //square difference of mean from each element divided by total size of array over squareroot
}
return sd;
}
int getMean(int list[], int size)
{
int mean = list[0];
for (int i = 0; i < size; i++)
{
mean = mean + list[i];
}
mean = mean / size;
return mean;
}
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