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#include <iostream>
#include <fstream>
#include <string>
#include <ctime>
void merge(int *a, int size, int low, int high, int mid)
{
int i, j, k;
int *c = new int[size];
i = low;
k = low;
j = mid + 1;
while (i <= mid && j <= high)
{
if (a[i] < a[j])
{
c[k] = a[i];
k++;
i++;
}
else
{
c[k] = a[j];
k++;
j++;
}
}
while (i <= mid)
{
c[k] = a[i];
k++;
i++;
}
while (j <= high)
{
c[k] = a[j];
k++;
j++;
}
for (i = low; i < k; i++)
{
a[i] = c[i];
}
}
void mergeSortIterative(int* arr, int size, int low, int high)
{
int mid;
for (int i = 2; i <= size; i *= 2) {
for (int x = 0; x < size; x += i)
{
int newHigh;
if (x + i - 1 < size - 1)
{
newHigh = x + i - 1;
}
else
{
newHigh = size - 1;
}
mid = (newHigh - low) / 2;
merge(arr, size, x, newHigh, mid);
}
}
return;
}
int main()
{
std::ifstream inFile;
std::string inFileName;
int count = 0;
int *myIterative;
int index;
int nums = 0;
// Get filename from user
std::cout << "Enter the input filename: " << std::endl;
std::cin >> inFileName;
// Open input file
inFile.open(inFileName.c_str(), std::ios::app);
// process input file
while (!inFile)
{
// the file could not be found and opened
//display error message
std::cout << "Could not access file" << std::endl;
std::cin >> inFileName;
}
while (inFile >> index) {
count++;
}
myIterative = new int[count];
inFile.clear();
inFile.seekg(0, inFile.beg);
while (inFile >> index) {
myIterative[nums] = index;
nums++;
}
for (int x = 0; x < nums; x++) {
std::cout << "Given integers Iterative: " << myIterative[x] << std::endl;
std::cout << x << std::endl;
}
mergeSortIterative(myIterative, nums, 0, nums - 1);
for (int x = 0; x < nums; x++) {
std::cout << "Sorted Iterative Array: " << myIterative[x] << std::endl;
std::cout << x << std::endl;
}
return 0;
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