Histogram help

[SilentHunter7]

Can't seem to figure out how to output the histogram in this form:

  * 
* *   * 
* *   * * *
* * * * * * *
-------------
1 2 3 4 5 6 7

for an input of - 1 2 2 1 4 5 4 2 3 5 6 7 4 1 2 -1. Note this is just an example of an input of numbers. Also any negative number is the sentinel. The range of numbers that can be entered is 0-9 and maximum of 100 numbers can be entered.

Here's my code:

#include <iostream>
using namespace std;

int main()
{
    const int max = 100;
    int numbers[max] = { 0 };
    int frequency[9] = { 0 };
    int num;
    
    cout << "Enter a maximum of 100 numbers (from 0-9) and a negative to stop: ";

    for(int i = 1; i < max && numbers[i - 1] >= 0; i++)
    {
        cin >> numbers[i];

        if(numbers[i] == 1)
            frequency[0]++;

        else if(numbers[i] == 2)
            frequency[1]++;

        else if(numbers[i] == 3)
            frequency[2]++;

        else if(numbers[i] == 4)
            frequency[3]++;

        else if(numbers[i] == 5)
            frequency[4]++;

        else if(numbers[i] == 6)
            frequency[5]++;

        else if(numbers[i] == 7)
            frequency[6]++;

        else if(numbers[i] == 8)
            frequency[7]++;

        else if(numbers[i] == 9)
            frequency[8]++;

        else if(numbers[i] > 9)
            cout << "Enter a number from 0-9";

    }

    cout << endl;

    for(int j = 1; j <= 9; j++)
    {
        cout << "\n";
        
        for(int k = frequency[j]; k >= 1; k--)
        {
            cout << "* ";
        }
    }
    
    return 0;
}