// Read in 3 numbers, sort, print 
#include <iostream>
using namespace std;
void swap(double&, double&);
int main()
{ double 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<<"The numbers are: "<<num1<<" "<<num2<<" "<<num3<<"\n"; 
  return 0;
} //main

void swap(double &n1, double &n2)
//receives n1 and n2 by reference, swaps them
{ double temp;
  temp=n1;
  n1=n2;
  n2=temp;
} //swap