Armstrong Number

#include<iostream>
using namespace std;
int main()
{
   int r;
   long number = 0, c, sum = 0, temp;
   cout<<"Enter an integer upto which you want to find armstrong numbers\n"<<endl;
   cin>>number;
   cout<<"Following armstrong numbers are found from 1 to this number:"<<endl;
     for( c = 1 ; c <= number ; c++ )
   {
      temp = c;
      while( temp != 0 )
      {
         r = temp%10;
         sum = sum + r*r*r;
         temp = temp/10;
      }
      if ( c == sum )
         cout<<c<<endl;
      sum = 0;
   }
  return 0;
}