//Sort 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 3 numbers, sort, print
{ int num1, num2, num3;
  cout<<"enter a number ";
  cin>>num1;
  cout<<"enter a number ";
  cin>>num2;
  cout<<"enter a number ";
  cin>>num3; 
  if (num1>num2) swap(num1, num2);
  if (num2>num3) swap(num2, num3);
  if (num1>num2) swap(num1, num2);
  cout<<"In order: "<<num1<<" "<<num2<<" "<<num3<<"\n";
} //main