//Sort array of 3 numbers
#include <iostream>
using namespace std;
void swap(int& n1, int& n2)
//receive  n1 and n2 by reference, exchange
{ int temp;
  temp=n1;
  n1=n2;
  n2=temp;
} //swap

void main() //input an array of 3 numbers, sort, print
{ int num[3];
  int index;
  for (index=0; index<3; index++)
  { cout<<"enter a number ";
    cin>>num[index];
  } //for
  if (num[0]>num[1]) swap(num[0], num[1]);
  if (num[1]>num[2]) swap(num[1], num[2]);
  if (num[0]>num[1]) swap(num[0], num[1]);
  cout<<"In order: ";
  for (index=0; index<3; index++)
    cout<<num[index]<<" ";
  cout<<"\n";
} //main