#include <iostream> 

int func(int* i) 
{ 
  int j = *i; 
  *i = 2 * j; 
  return j / 2; 
} 

int main() 
{ 
  int zahl1 = 10, zahl2; 

  zahl2 = func(&zahl1); 
  std::cout << zahl1 << ", " << zahl2 << std::endl; 
}