Need help with Brownian motion

[mr103]

I was given an assignment with four parts, and one of the parts was to generate Brownian motion. How would I go about doing this?
By the way, this is my code so far:

#include<iostream>
#include<iomanip>
#include <cstdlib>
#include <ctime>

using namespace std;

const int size = 10;

double randomgen(double min, double max) {
double range = (max - min);
double div = RAND_MAX / range;
return min + (rand() / div);
}

int main()
{
double Min, Max;

cout<< "\nWhat is the minimum value in your array? >> ";
cin >> Min;
cout<< "\nWhat is the max value in your array? >> ";
cin >> Max;

double array[size];
array[0] = 0;


for(int i=1; i<size; i++){
array[i] = array[i-1] + randomgen(Min, Max);

cout << array[i] << endl;
}
system("PAUSE");
return EXIT_SUCCESS;;
}

This code was used to an array of random numbers between min and max. I'm not sure how to go about doing Brownian motion in this code.

[chicofeo]

Please use the code tags for your code. HINT: Edit your post, highlight your whole code, then select the <> icon on your right side of the post.