Use friend function to operator: <<, >>


#include <iostream>
using namespace std;

class factor {
  int num;   // number
  int lfact; // lowest factor
public:
  factor(int i);
  friend ostream &operator<<(ostream &stream, factor ob);
  friend istream &operator>>(istream &stream, factor &ob);
};

factor::factor(int i)
{
  int n;

  num = i;

  for(n=2; n < (i/2); n++)
    if(!(i%n)) break;

  if(n<(i/2)) lfact = n;
  else lfact = 1;
}

istream &operator>>(istream &stream, factor &ob)
{
  stream >> ob.num;

  int n;

  for(n=2; n < (ob.num/2); n++)
    if(!(ob.num%n)) break;
  if(n < (ob.num/2)) 
     ob.lfact = n;
  else 
  ob.lfact = 1;

  return stream;
}

ostream &operator<<(ostream &stream, factor ob)
{
  stream << ob.lfact << " is lowest factor of ";
  stream << ob.num << '\n';

  return stream;
}

int main()
{
  factor o(32);

  cout << o;

  cin >> o;
  cout << o;

  return 0;
}

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Use friend function to operator: <<, >> : Inserter « Overload « C++

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