rem: case 'x':   ed *= 1.1;
add: case 'x':   ed = ed ? ed * 1.1 : 1; break; case 'm':   ed = 0;
context: void keyboard(unsigned char k, int, int){    switch(k)    {    case 27:    exit(1);    case 'z':   ed /= 1.1;                break;    case 'x':   ed *= 1.1;                break;             }        cout << " ED:" << ed << endl;        for (int i = 0; i < 6; ++i)    {        beginEditCP(decos[i]);        decos[i]->setEyeSeparation(ed);        endEditCP  (decos[i]);    } }