#include <iostream>
 
 void Square (int&,int&);
 void Cube (int&, int&);
 void Swap (int&, int &);
 void PrintVals(int, int);
 
 int main()
 {
     void (* pFunc) (int &, int &);

     int valOne=1, valTwo=2;

     PrintVals(valOne, valTwo);
     pFunc(valOne, valTwo);
     PrintVals(valOne, valTwo);

     pFunc = Square; 
     PrintVals(valOne, valTwo);
     pFunc(valOne, valTwo);
     PrintVals(valOne, valTwo);

     pFunc = Cube; 
     PrintVals(valOne, valTwo);
     pFunc(valOne, valTwo);
     PrintVals(valOne, valTwo);

     pFunc = Swap; 
     PrintVals(valOne, valTwo);
     pFunc(valOne, valTwo);
     PrintVals(valOne, valTwo);
     
     return 0;
 }
 
 void PrintVals(int x, int y)
 {
     std::cout << "x: " << x << " y: " << y << std::endl;
 }
 
 void Square (int & rX, int & rY)
 {
     rX *= rX;
     rY *= rY;
 }
 
 void Cube (int & rX, int & rY)
 {
     int tmp;
 
     tmp = rX;
     rX *= rX;
     rX = rX * tmp;
 
     tmp = rY;
     rY *= rY;
     rY = rY * tmp;
 }
 
 void Swap(int & rX, int & rY)
 {
     int temp;
     temp = rX;
     rX = rY;
     rY = temp;
 }