I had asked this question couple days ago but It did not solve my problem. I cannot increase stack size in Visual Studio, I am using recursive method which gets high input and it causes to stack overflow. I cannot use vector or something else. What I need is to increase stack size in c++, Visual Studio.
P.S. I increased stack reserve size from Visual Studio configuration, however, it does not also solve my problem.
void sorting:: MergeSort(int *theArray, int n) {
mergesort(theArray, 0, n - 1);
}
void sorting::mergesort(int *theArray, int first, int last) {
if (first < last) {
int mid = (first + last) / 2; // index of midpoint
mergesort(theArray, first, mid);
mergesort(theArray, mid + 1, last);
// merge the two halves
merge(theArray, first, mid, last);
}
} // end mergesort
void sorting::merge(int* theArray, int first, int mid, int last) {
const int max_size = 500000;
int tempArray[max_size];
int first1 = first; // beginning of first subarray
int last1 = mid; // end of first subarray
int first2 = mid + 1; // beginning of second subarray
int last2 = last; // end of second subarray
int index = first1; // next available location in tempArray
for (; (first1 <= last1) && (first2 <= last2); ++index) {
if (theArray[first1] < theArray[first2]) {
tempArray[index] = theArray[first1];
++first1;
}
else {
tempArray[index] = theArray[first2];
++first2;
}
}
// finish off the first subarray, if necessary
for (; first1 <= last1; ++first1, ++index)
tempArray[index] = theArray[first1];
// finish off the second subarray, if necessary
for (; first2 <= last2; ++first2, ++index)
tempArray[index] = theArray[first2];
// copy the result back into the original array
for (index = first; index <= last; ++index)
theArray[index] = tempArray[index];
delete[] tempArray;
} // end merge
And my main function.
#include <iostream>
#include <ctime>
#include "sorting.h"
using namespace std;
int main()
{
sorting sort;
int size = 500000;
int *myArr=new int[size];
for (int i = 0; i < size; i++) {
myArr[i] = rand() % size;
}
cout << clock()<<" ";
sort.MergeSort(myArr,size);
cout<<clock();
cin.get();
}
