Program runs, but I would like it to exit with a negative number input

My first time posting. This program is/was a homework problem. It works as required, but I would like to eliminate negative numbers and have it exit with the input of a negative rather than zero. All mods i have made just screwed it up and I know it's simple. What areas need to be changed to get this ?

Code:

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#include <iostream>
#include <iomanip>
#include <string>
#include <cmath>
using namespace std;

class Numbers
{
private:
    int number; 

public:
 
    Numbers(int a)
      {number=a;}
    void print();
};


void Numbers::print()
{
        int n;
        string lessthan20[20]={"zero","one","two","three","four","five","six","seven",
                  "eight","nine","ten","eleven","twelve","thirteen",
                    "fourteen","fifteen","sixteen","seventeen",
                    "eighteen","nineteen"};

        string tens[10]={"zero","ten","twenty","thirty","forty","fifty","sixty",
                "seventy", "eighty", "ninety"};
        if(number<0)
        cout<<"negative ";
        number=abs(number);
        n=number/1000;
    if(n>0)
    cout<<" "<<lessthan20[n]<<" thousand ";
        number%=1000;

        n=number/100;
        if(n>0)
    cout<< lessthan20[n]<<" hundred ";
        number%=100;
        if(number>=20)
    {
        n=number/10;         
        if(n>0)       
          cout<<tens[n]<<" ";
    }
        else if(number>=10)
    {
        cout<< lessthan20[number]<<" ";
        return;
    }
        number%=10;
        if(number>0)
    cout<<lessthan20[number];
    cout<<" ";

}

int main()
{
    int n;
    cout<<" This program will take an input of up to four(4) numerals\n";
    cout<<" and change them to a written number.\n";
    cout<<" Enter up to a four-digit number(0 to exit): ";
    cin>>n;   
    while(n!=0)
  {
        Numbers number(n);
        number.print();

      cout<<"\nEnter a number(0 to exit): ";
      cin>>n; 
  }
system("pause");
return 0;
}

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Quote:

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Originally Posted by msanak

I would like to eliminate negative numbers and have it exit with the input of a negative rather than zero.

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Just change the loop condition from (n!=0) to (n >= 0).

Consistent and good indentation would help. I suspect you have lots of bugs where missing curly braces should be.

I knew it was a simple fix. When looking over my code after the response, I just gave a whack to the forhead and thought'stupid! It was staring at you- take out the ! when you change the loop, don't leave it there" Thanks for pointing out what i was missing.