rem: cout << "ZPP:" << zpp << " ED:" << ed << endl;
add: std::cout << "ZPP:" << zpp << " ED:" << ed << std::endl;
context: void keyboard(unsigned char k, int, int){    switch(k)    {    case 27:    exit(1);    case 'a':   zpp /= 1.1;                break;    case 's':   zpp *= 1.1;                break;    case 'z':   ed /= 1.1;                break;    case 'x':   ed *= 1.1;                break;             }        cout << "ZPP:" << zpp << " ED:" << ed << endl;        beginEditCP(decoleft);    decoleft->setEyeSeparation(ed);    decoleft->setZeroParallaxDistance(zpp);    endEditCP  (decoleft);        beginEditCP(decoright);    decoright->setEyeSeparation(ed);    decoright->setZeroParallaxDistance(zpp);    endEditCP  (decoright);}