Histogram issues

[enigmaterror]

Hello I've written a program that makes the user input positive numbers, and a negative number. The negative number tells the program that the user has stopped inputting numbers. Now my problem is that the numbers the user inputed haver to be turned into *. For example if the user inputs 1, 2 ,3, -1 the output would be
*
**
***
I've written something similar to it now instead of *, it just outputs numbers again. Can anyone help me with this. Thank you in advanced. Here is my code:

#include <iostream>
#include <vector>
using namespace std;

int main( )
{
    vector<int> v;
    cout << "Enter a list of positive numbers.\n"
         << "Place a negative number at the end.\n";

    int next;
    cin >> next;
    while (next > 0)
    {
        v.push_back(next);
        cout << next << endl;
        cin >> next;
    }

    cout << "You entered:\n";
    for (unsigned int i = 0; i < v.size( ); i++)
        cout << v[i] << "\n";
    cout << endl;
    
    system("pause");
    return 0;
}

[ProgrammingNoob]

Error 1: You are going to be receiving a few nuclear warheads for system("pause");


see here: http://www.cplusplus.com/forum/beginner/1988/

[enigmaterror]

Yeah I have been told that before but this code is just for me I'm new to vectors and this is just something to help me out with vectors, so it's not like this code is for proffesional use.