C++ Function Parameter two arguments passed by reference

#include <iostream>
using namespace std;
void order(int&, int&);          //prototype
int main()/*  w ww .  j a  v  a2s  .c  o  m*/
{
   int n1=99, n2=11;                //this pair not ordered
   int n3=22, n4=88;                //this pair ordered
   order(n1, n2);                   //order each pair of numbers
   order(n3, n4);
   cout << "n1=" << n1 << endl;
   cout << "n2=" << n2 << endl;
   cout << "n3=" << n3 << endl;
   cout << "n4=" << n4 << endl;
   return 0;
}
void order(int& numb1, int& numb2)
{
   if(numb1 > numb2)                //if 1st larger than 2nd,
   {
      int temp = numb1;             //swap them
      numb1 = numb2;
      numb2 = temp;
   }
}