Answered Essay: Create a merge sort that can read any list of number from a text file and print them out. Also print the number of compariso

C++ Program (Linux):

Create a merge sort that can read any list of number from a text file and print them out. Also print the number of comparison (how many time is had to compare number in order to sort).

Expert Answer

 

C++ Program:

#include <iostream>
#include <fstream>
#include <vector>

using namespace std;

//Function prototypes
void mergeSort(vector<int>&, int, int);
void mergeArrays(vector<int>&, int, int, int);

int main()
{
int val, n, i;
vector<int> values;

//Opening file in read mode
fstream fin(“ipFile.txt”, ios::in);

//Reading list of values in to vector
while(fin >> val)
{
//Storing in to vector
values.push_back(val);
}

//Closing file
fin.close();

cout << “nn Actual Values read from file: “;

//Printing values
for(i=0; i<values.size(); i++)
{
cout << ” t ” << values[i];
}

//Getting size
n = values.size();

//Sorting array
mergeSort(values, 0, n-1);

//Printing sorted array
cout << “nn Values after sorting: “;

//Printing values
for(i=0; i<n; i++)
{
cout << ” t ” << values[i];
}

cout << “nn”;
return 0;
}

//Function that sorts the array
void mergeSort(vector<int>& values, int low, int high)
{
int mid;

//Loop till both boundaries meet
if(low < high)
{
//Calculating middle position of array
mid=(low+high)/2;

//Operating on left side of array
mergeSort(values, low, mid);

//Operating on right side of array
mergeSort(values, mid+1, high);

//Merging arrays
mergeArrays(values, low, mid, high);
}
}

//Function that sorts two arrays into single array
void mergeArrays(vector<int>& values,int low,int mid,int high)
{
int i, j, k, temp[50];

//Initializing indexes
i = low;
k = low;

j = mid + 1;

//Loop till either of array reaches boundary
while (i <= mid && j <= high)
{
//Comparing elements
if (values[i] < values[j])
{
//Adding to array from left side
temp[k] = values[i];

//Incrementing index
k++;
i++;
}
else
{
//Adding to array from left side
temp[k] = values[j];

//Incrementing index
k++;
j++;
}
}

//Adding elements from left side array
while (i <= mid)
{
temp[k] = values[i];
k++;
i++;
}

//Adding elements from right side array
while (j <= high)
{
temp[k] = values[j];
k++;
j++;
}

//Copying values
for (i = low; i < k; i++)
{
values[i] = temp[i];
}
}

__________________________________________________________________________________________________

Sample Output:

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