while loop

#include"stdafx.h"
#include<iostream>
usingnamespace std;
int main()
{
int number,count=0,sum=0,large=0,small=0;
float avg;

 cout<<"Please enter a positive number: "<<endl;
 cin>>number;
 small=number;
 large=number;
while(number>=0)
 {
if(number>0)
 {
 sum=sum+number;
 count++;
 }
if(number<small)
 {
   small=number;
 }
if(number>large)
 {
  large=number;
 }
 cout<<"Please enter another number: ";
 cin>>number;
 }
 cout<<"The largest number you entered is: "<<large<<endl;
 cout<<"\nThe smallest number you entered is: "<<small<<"\n";
 avg=float (sum)/count;
 cout<<"\nThe average of positive numbers you entered is :"<<avg<<endl<<endl;
system("pause");
return 0;
}