C++ Code segmentation fault only in vscode - c++

Question

My C++ code (shown below) works on this site:
GDB Online but not in Visual Studio, where it crashes at
iterations[imag_times][real_times] = i % (iter / 2);
when imag_times is 1 and real_times is 0 with the exception being Exception has occurred. Segmentation fault
I have installed GDB version 7.6.1.
My Question: Does anybody know how to fix that and why this is happening?
#include <iostream>
using namespace std;
int main()
{
// initialization
const double real_min = -1;
const double real_max = 1;
const double imag_min = -1;
const double imag_max = 1;
const int iter = 30;
const double real_offs = 0.01;
const double imag_offs = 0.01;
double z_real = 0;
double z_imag = 0;
double c_real = real_min;
double c_imag = imag_max;
int real_times = 0;
int imag_times = 0;
int** iterations = new int*[1];
iterations[0] = new int;
int i = 0;
// start
while(c_imag >= imag_min)
{
iterations = (int**)realloc(iterations, sizeof(int*) * (imag_times + 1));
real_times = 0;
c_real = real_min;
while(c_real <= real_max)
{
iterations[imag_times] = (int*)realloc(iterations[imag_times], sizeof(int) * (real_times + 1));
z_real = 0;
z_imag = 0;
for(i = 0; i < iter; i++)
{
double z_imag2 = z_imag * z_imag;
z_imag = 2 * z_real * z_imag + c_imag;
z_real = z_real * z_real - z_imag2 + c_real;
if(z_real * z_real + z_imag * z_imag > 4)
{
break;
}
}
iterations[imag_times][real_times] = i % (iter / 2);
real_times++;
c_real = real_min + real_offs * real_times;
}
imag_times++;
c_imag = imag_max - imag_offs * imag_times;
}
// output
for(int i = 0; i < imag_times; i++)
{
for(int j = 0; j < real_times; j++)
{
cout << iterations[i][j];
cout << ",";
}
cout << "\n";
}
cout << "done";
std::cin.get(); // pause so the program doesnt exit instantly
return 0;
}
Thanks in advance!