#include <iostream>
using namespace std;

int square(int number)
{
  return number*number;
}


bool read_coordinates(int &x, int &y)
{
  cout << "give x "; cin >> x;
  cout << "give y "; cin >> y;
  return true;
}


void swapInt(bool actuallySwap, int &a, int &b)
{
  if (actuallySwap) {
    int t = a;
    a = b;
    b = t;
  }
}

void increment(int &a)
{
  a++;
}




int main()

{

	int x,y;

	read_coordinates(x,y);

	swapInt(x,y);

	cout << x << ":" << y << endl;


	int i = 10;
      	increment(i);
	cout << i << endl;


	return 0;

}