#include <iostream>


void vaihda( int* pa,int* pb ){
	int apu;
        std::cout << "osoite a:lle =" << a << std::endl;
        std::cout << "luku a=" << *pa << std::endl;

	apu = *pa;
	*pa = *pb;
	*pb = apu;


}


int main() {
   int a=3;
   int b=5;

   std::cout << "luku a=" << a << std::endl;
   std::cout << "luku b=" << b << std::endl;

   vaihda(&a,&b);

   std::cout << "luku a=" << a << std::endl;
   std::cout << "luku b=" << b << std::endl;

}